Haiying Bie - Academia.edu (original) (raw)
Papers by Haiying Bie
The cadmium analogue of the thermoelectric material "β-Zn 4 Sb 3 " has been prepared by... more The cadmium analogue of the thermoelectric material "β-Zn 4 Sb 3 " has been prepared by reaction of a mixture of the elements with nominal stoichiometry "Cd 57 Sb 43 " at 430 °C. The composition of this phase, previously assumed to be "Cd 4 Sb 3 " in analogy to "β-Zn 4 Sb 3 ", has been determined to be approximately Cd 12.7 (1)Sb 10 , in agreement with recently revised formulations for the zinc analogue, which is now better described as Zn 13 Sb10. Single-crystal X-ray diffraction studies at 295 K showed that the structure of Cd 12.7 Sb 10 (space group R3c, Z = 6, a = 13.0395(14) A, c = 13.0346(14) A) is similar to that of Zn 13 -Sb10, but with a more complex set of interstitial metal sites. The structure remains unchanged at 193 K. The electrical resistivity of Cd 12.7 Sb 10 decreases linearly with decreasing temperature and shows a modest upturn near 35 K.
ABSTRACT A novel cobalt phosphomolybdate: (NH 3CH 2CH 2NH 3)(NH 3CH 2CH 2NH 2) 3Na 3[Co 4Mo 12O 2... more ABSTRACT A novel cobalt phosphomolybdate: (NH 3CH 2CH 2NH 3)(NH 3CH 2CH 2NH 2) 3Na 3[Co 4Mo 12O 24(OH) 6(H 2O) 2 (HPO 4) 2(PO 4) 6]·8H 2O 1, has been hydrothermally synthesized (200°C, 5 days, autogenously pressure) and characterized by IR, ESR, XPS, elemental analyses and X-ray crystallography. The crystal data: monoclinic space group C2/ c, a=12.3281(3) Å, b=21.5729(4) Å, c=26.0242(5) Å, β=99.5401°(3), V=6825(2) Å 3, Z=4, R1=0.0346, w R2=0.0650. The structure of compound 1 is based on Co[Mo 6P 4] 2 units connected together via additional Co 2+ ions to give a new three-dimensional framework. The interconnected void and channels in the cobalt molybdophosphate frameworks are filled with counter cations and water molecules. The magnetic property of 1 exhibits antiferromagnetic coupling interactions.
Chem Mater, 2007
Chromium I 5500 Structures and Physical Properties of Rare-Earth Chromium Germanides LnCrGe 3 (Ln... more Chromium I 5500 Structures and Physical Properties of Rare-Earth Chromium Germanides LnCrGe 3 (Ln: LaNd , Sm).-Single crystals of the title compounds are synthesized by reaction of the elements in a tin flux (Ln:Cr:Ge:Sn = 3:1:5:10; 850 °C, 4 d and 500°C, 4 d). The structures are determined by single crystal and powder XRD. The LnCrGe3 (Ln: LaNd , Sm) compounds crystallize in the hexagonal space group P63/mmc with Z = 2. The crystal structures contain chains of face-sharing Cr-centered octahedra linked by triangular Ge 3 clusters. The compounds are further characterized by electrical resistivity and magnetic susceptibility measurements, and by TB-LMTO band structure calculations.-(BIE, H.;
Chem Mater, 2007
... Acknowledgment. This work was supported by the Natural Sciences and Engineering Research Coun... more ... Acknowledgment. This work was supported by the Natural Sciences and Engineering Research Council of Canada and the University of Alberta. ... Nauk SSSR, Neorg. Mater.1967, 3, 1360−1369. [ChemPort]. (5) Shevchenko, V. Ya.; Skripkin, VA; Ugai, Ya. A.; Marshakova, TA Izv. ...
J Solid State Chem, 2007
Investigations on phase relationships and crystal structures have been conducted on several terna... more Investigations on phase relationships and crystal structures have been conducted on several ternary rare-earth titanium antimonide systems. The isothermal cross-sections of the ternary RE-Ti-Sb systems containing a representative early (RE ¼ La) and late rare-earth element (RE ¼ Er) have been constructed at 800 1C. In the La-Ti-Sb system, the previously known compound La 3 TiSb 5 was confirmed and the new compound La 2 Ti 7 Sb 12 (own type, Cmmm, Z ¼ 2, a ¼ 10.5446(10) Å , b ¼ 20.768(2) Å , and c ¼ 4.4344(4) Å) was discovered. In the Er-Ti-Sb system, no ternary compounds were found. The structure of La 2 Ti 7 Sb 12 consists of a complex arrangement of TiSb 6 octahedra and disordered fragments of homoatomic Sb assemblies, generating a three-dimensional framework in which La atoms reside. Other early rare-earth elements (RE ¼ Ce, Pr, Nd) can be substituted in this structure type. Attempts to prepare crystals in these systems through use of a tin flux resulted in the discovery of a new Sn-containing pseudoternary phase RETi 3 (Sn x Sb 1Àx) 4 for RE ¼ Nd, Sm (own type, Fmmm, Z ¼ 8; a ¼ 5.7806(4) Å , b ¼ 10.0846(7) Å , and c ¼ 24.2260(16) Å for NdTi 3 (Sn 0.1 Sb 0.9) 4 ; a ¼ 5.7590(4) Å , b ¼ 10.0686(6) Å , and c ¼ 24.1167(14) Å for SmTi 3 (Sn 0.1 Sb 0.9) 4). Its structure consists of double-layer slabs of Ti-centred octahedra stacked alternately with nets of the RE atoms; the Ti atoms are arranged in kagome nets.
J Solid State Chem, 2004
ABSTRACT A novel cobalt phosphomolybdate: (NH 3CH 2CH 2NH 3)(NH 3CH 2CH 2NH 2) 3Na 3[Co 4Mo 12O 2... more ABSTRACT A novel cobalt phosphomolybdate: (NH 3CH 2CH 2NH 3)(NH 3CH 2CH 2NH 2) 3Na 3[Co 4Mo 12O 24(OH) 6(H 2O) 2 (HPO 4) 2(PO 4) 6]·8H 2O 1, has been hydrothermally synthesized (200°C, 5 days, autogenously pressure) and characterized by IR, ESR, XPS, elemental analyses and X-ray crystallography. The crystal data: monoclinic space group C2/ c, a=12.3281(3) Å, b=21.5729(4) Å, c=26.0242(5) Å, β=99.5401°(3), V=6825(2) Å 3, Z=4, R1=0.0346, w R2=0.0650. The structure of compound 1 is based on Co[Mo 6P 4] 2 units connected together via additional Co 2+ ions to give a new three-dimensional framework. The interconnected void and channels in the cobalt molybdophosphate frameworks are filled with counter cations and water molecules. The magnetic property of 1 exhibits antiferromagnetic coupling interactions.
Cheminform, Mar 31, 2009
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
J Solid State Chem, 2011
Ternary bismuthides RE 5 TtBi 2 containing rare-earth (RE ¼ LaNd , Gd-Er) and tetrel (Tt ¼ Si, Ge... more Ternary bismuthides RE 5 TtBi 2 containing rare-earth (RE ¼ LaNd , Gd-Er) and tetrel (Tt ¼ Si, Ge) atoms have been prepared by arc-melting of the elements followed by annealing at 800 1C. They adopt the b-Yb 5 Sb 3-type structure (Pearson symbol oP32, space group Pnma, Z ¼4), as revealed through analysis by single-crystal X-ray diffraction on Ce 5 Si 0.869(4) Bi 2.131(4) and powder X-ray diffraction on Ce 5 GeBi 2. Cell parameters for the entire series lie in the ranges of a¼ 12.8-11.8Å, b ¼9.6-9.0Å, and c ¼8.4-7.9Å. Solid solubility in Ce 5 Si x Bi 3 À x and Pr 5 Si x Bi 3 À x (approximately 0.9 r x r 1.2, depending on the RE member) is much more limited compared to the antimonides, consistent with a highly ordered structure in which the two possible anion sites are essentially segregated into a smaller one occupied by Tt atoms (CN7) and a larger one occupied by Bi atoms (CN9). Band structure calculations on La 5 SiBi 2 confirm the importance of La-La bonding interactions near the Fermi level. X-ray photoelectron spectra support the presence of partially anionic Bi atoms, as indicated by a small negative binding energy shift relative to elemental Bi. The Ce and Pr members undergo magnetic transitions at low temperatures, possibly involving ferromagnetic interactions, that are strongly influenced by the nature of the Tt atom.
ChemInform, 2009
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform, 2008
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform, 2011
ABSTRACT The title compounds are prepared by arc-melting stoichiometric mixtures of the elements ... more ABSTRACT The title compounds are prepared by arc-melting stoichiometric mixtures of the elements with a 5—7 wt.% excess of Bi followed by annealing at 800 °C for at least two weeks.
ABSTRACT This thesis focuses on the synthesis, structures, and physical properties of ternary rar... more ABSTRACT This thesis focuses on the synthesis, structures, and physical properties of ternary rare-earth antimonides and germanides. These ternary compounds exhibit diverse polyanionic substructures with classical and non-classical Sb-Sb bonding, Ge-Ge bonding, or both. The Zintl-Klemm concept and band structure calculations were applied to understand their structures and bonding. Electrical resistivities and magnetic properties were measured for these compounds. The compounds RE2Ti7Sb12 (RE = La-Nd) and RE2Ti 11-xSb14+x (RE = Sm, Gd, Tb, Yb), which were synthesized by arc-melting, adopt different structures depending on the size of the RE atoms. Both consist of a complex arrangement of TiSb n polyhedra, linked to form a 3D framework with large cavities in which the RE atoms reside. Hypervalent Sb-Sb bonds are manifested in disordered Sb fragments in RE2Ti 7Sb12, and 1D linear chains, zig-zag chains, and pairs in RE2Ti11-xSb 14+x. A series of compounds, RECrGe3 ( RE = La-Nd, Sm), was synthesized by the Sn-flux method. They adopt a hexagonal perovskite structure type, in which chains of face-sharing Cr-centered octahedra are linked by triangular Ge3 clusters. These unusual single-bonded Ge3 substructures can be rationalized simply by the Zintl-Klemm concept. Electrical resistivity measurements show metallic behaviour with prominent transitions coincident with ferromagnetic transitions ( Tc ranging from 62 to 155 K) found in magnetic measurements. Band structure calculations show the presence of a narrow, partially filled band with high DOS at Ef, in agreement with the observation that LaCrSb3 is an itinerant ferromagnet. With a different number of d-electrons in the M site, the isostructural REVGe3 compounds exhibit antiferromagnetic behaviour. The doped quaternary compounds LaCr1-xV xGe3 and LaCr1-xMn xGe3 exhibit depressed Curie temperatures. The structures of RECrxGe 2 compounds (RE = Sm, Gd-Er) are built up by inserting transition-metal atoms into the square pyramidal sites of a hypothetical " REGe2" host structure (ZrSi2-type). The presence of extensive anionic Ge substructures in the form of 1D zigzag chains and 2D square sheets can be explained by the Zintl-Klemm concept. Magnetic measurements indicated antiferromagnetic ordering with low T N ranging from 3 to 17K. Compounds involving a p-block element as the second component were prepared. In RE12Ge7-xSb 21 (RE = La-Pr), a complex 3D polyanionic framework with Ge pairs, five-atom-wide Sb ribbons, and 2D Ge/Sb layers is present. The bonding exemplifies the competition of valence electron transfer from the RE atoms to metalloids with similar electronegativities. Full electron transfer from the RE atoms to the anionic substructure cannot be assumed. Magnetic measurements on Ce12Ge6.5Sb 21 indicate antiferromagnetic coupling. The metal-rich compounds RE5TtxSb3-x (Tt = Si, Ge) adopt the orthorhombic beta-Yb5Sb 3-type structure with a range of solid solubility of 0.9 ≤ x ≤ 1.6. They are not electron-precise and do not obey the Zintl-Klemm concept.
... 98 X. Zhu et al. ... Ellis III HV, McCann JL (eds) Lewis Publishers, Chelsea, UK, p 51 [4] Li... more ... 98 X. Zhu et al. ... Ellis III HV, McCann JL (eds) Lewis Publishers, Chelsea, UK, p 51 [4] Lindqvist O (1995) J Power Sources 57: 3 [5] Liu JF, Chao JB, Jiang GB (2002) Anal Chim Acta 455: 93 [6] Osamu K, Haeng-Boo K, Noboru K (2000) Anal Chim Acta 418: 129 [7] Zanjanchi MA ...
The cadmium analogue of the thermoelectric material "β-Zn 4 Sb 3 " has been prepared by... more The cadmium analogue of the thermoelectric material "β-Zn 4 Sb 3 " has been prepared by reaction of a mixture of the elements with nominal stoichiometry "Cd 57 Sb 43 " at 430 °C. The composition of this phase, previously assumed to be "Cd 4 Sb 3 " in analogy to "β-Zn 4 Sb 3 ", has been determined to be approximately Cd 12.7 (1)Sb 10 , in agreement with recently revised formulations for the zinc analogue, which is now better described as Zn 13 Sb10. Single-crystal X-ray diffraction studies at 295 K showed that the structure of Cd 12.7 Sb 10 (space group R3c, Z = 6, a = 13.0395(14) A, c = 13.0346(14) A) is similar to that of Zn 13 -Sb10, but with a more complex set of interstitial metal sites. The structure remains unchanged at 193 K. The electrical resistivity of Cd 12.7 Sb 10 decreases linearly with decreasing temperature and shows a modest upturn near 35 K.
ABSTRACT A novel cobalt phosphomolybdate: (NH 3CH 2CH 2NH 3)(NH 3CH 2CH 2NH 2) 3Na 3[Co 4Mo 12O 2... more ABSTRACT A novel cobalt phosphomolybdate: (NH 3CH 2CH 2NH 3)(NH 3CH 2CH 2NH 2) 3Na 3[Co 4Mo 12O 24(OH) 6(H 2O) 2 (HPO 4) 2(PO 4) 6]·8H 2O 1, has been hydrothermally synthesized (200°C, 5 days, autogenously pressure) and characterized by IR, ESR, XPS, elemental analyses and X-ray crystallography. The crystal data: monoclinic space group C2/ c, a=12.3281(3) Å, b=21.5729(4) Å, c=26.0242(5) Å, β=99.5401°(3), V=6825(2) Å 3, Z=4, R1=0.0346, w R2=0.0650. The structure of compound 1 is based on Co[Mo 6P 4] 2 units connected together via additional Co 2+ ions to give a new three-dimensional framework. The interconnected void and channels in the cobalt molybdophosphate frameworks are filled with counter cations and water molecules. The magnetic property of 1 exhibits antiferromagnetic coupling interactions.
Chem Mater, 2007
Chromium I 5500 Structures and Physical Properties of Rare-Earth Chromium Germanides LnCrGe 3 (Ln... more Chromium I 5500 Structures and Physical Properties of Rare-Earth Chromium Germanides LnCrGe 3 (Ln: LaNd , Sm).-Single crystals of the title compounds are synthesized by reaction of the elements in a tin flux (Ln:Cr:Ge:Sn = 3:1:5:10; 850 °C, 4 d and 500°C, 4 d). The structures are determined by single crystal and powder XRD. The LnCrGe3 (Ln: LaNd , Sm) compounds crystallize in the hexagonal space group P63/mmc with Z = 2. The crystal structures contain chains of face-sharing Cr-centered octahedra linked by triangular Ge 3 clusters. The compounds are further characterized by electrical resistivity and magnetic susceptibility measurements, and by TB-LMTO band structure calculations.-(BIE, H.;
Chem Mater, 2007
... Acknowledgment. This work was supported by the Natural Sciences and Engineering Research Coun... more ... Acknowledgment. This work was supported by the Natural Sciences and Engineering Research Council of Canada and the University of Alberta. ... Nauk SSSR, Neorg. Mater.1967, 3, 1360−1369. [ChemPort]. (5) Shevchenko, V. Ya.; Skripkin, VA; Ugai, Ya. A.; Marshakova, TA Izv. ...
J Solid State Chem, 2007
Investigations on phase relationships and crystal structures have been conducted on several terna... more Investigations on phase relationships and crystal structures have been conducted on several ternary rare-earth titanium antimonide systems. The isothermal cross-sections of the ternary RE-Ti-Sb systems containing a representative early (RE ¼ La) and late rare-earth element (RE ¼ Er) have been constructed at 800 1C. In the La-Ti-Sb system, the previously known compound La 3 TiSb 5 was confirmed and the new compound La 2 Ti 7 Sb 12 (own type, Cmmm, Z ¼ 2, a ¼ 10.5446(10) Å , b ¼ 20.768(2) Å , and c ¼ 4.4344(4) Å) was discovered. In the Er-Ti-Sb system, no ternary compounds were found. The structure of La 2 Ti 7 Sb 12 consists of a complex arrangement of TiSb 6 octahedra and disordered fragments of homoatomic Sb assemblies, generating a three-dimensional framework in which La atoms reside. Other early rare-earth elements (RE ¼ Ce, Pr, Nd) can be substituted in this structure type. Attempts to prepare crystals in these systems through use of a tin flux resulted in the discovery of a new Sn-containing pseudoternary phase RETi 3 (Sn x Sb 1Àx) 4 for RE ¼ Nd, Sm (own type, Fmmm, Z ¼ 8; a ¼ 5.7806(4) Å , b ¼ 10.0846(7) Å , and c ¼ 24.2260(16) Å for NdTi 3 (Sn 0.1 Sb 0.9) 4 ; a ¼ 5.7590(4) Å , b ¼ 10.0686(6) Å , and c ¼ 24.1167(14) Å for SmTi 3 (Sn 0.1 Sb 0.9) 4). Its structure consists of double-layer slabs of Ti-centred octahedra stacked alternately with nets of the RE atoms; the Ti atoms are arranged in kagome nets.
J Solid State Chem, 2004
ABSTRACT A novel cobalt phosphomolybdate: (NH 3CH 2CH 2NH 3)(NH 3CH 2CH 2NH 2) 3Na 3[Co 4Mo 12O 2... more ABSTRACT A novel cobalt phosphomolybdate: (NH 3CH 2CH 2NH 3)(NH 3CH 2CH 2NH 2) 3Na 3[Co 4Mo 12O 24(OH) 6(H 2O) 2 (HPO 4) 2(PO 4) 6]·8H 2O 1, has been hydrothermally synthesized (200°C, 5 days, autogenously pressure) and characterized by IR, ESR, XPS, elemental analyses and X-ray crystallography. The crystal data: monoclinic space group C2/ c, a=12.3281(3) Å, b=21.5729(4) Å, c=26.0242(5) Å, β=99.5401°(3), V=6825(2) Å 3, Z=4, R1=0.0346, w R2=0.0650. The structure of compound 1 is based on Co[Mo 6P 4] 2 units connected together via additional Co 2+ ions to give a new three-dimensional framework. The interconnected void and channels in the cobalt molybdophosphate frameworks are filled with counter cations and water molecules. The magnetic property of 1 exhibits antiferromagnetic coupling interactions.
Cheminform, Mar 31, 2009
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
J Solid State Chem, 2011
Ternary bismuthides RE 5 TtBi 2 containing rare-earth (RE ¼ LaNd , Gd-Er) and tetrel (Tt ¼ Si, Ge... more Ternary bismuthides RE 5 TtBi 2 containing rare-earth (RE ¼ LaNd , Gd-Er) and tetrel (Tt ¼ Si, Ge) atoms have been prepared by arc-melting of the elements followed by annealing at 800 1C. They adopt the b-Yb 5 Sb 3-type structure (Pearson symbol oP32, space group Pnma, Z ¼4), as revealed through analysis by single-crystal X-ray diffraction on Ce 5 Si 0.869(4) Bi 2.131(4) and powder X-ray diffraction on Ce 5 GeBi 2. Cell parameters for the entire series lie in the ranges of a¼ 12.8-11.8Å, b ¼9.6-9.0Å, and c ¼8.4-7.9Å. Solid solubility in Ce 5 Si x Bi 3 À x and Pr 5 Si x Bi 3 À x (approximately 0.9 r x r 1.2, depending on the RE member) is much more limited compared to the antimonides, consistent with a highly ordered structure in which the two possible anion sites are essentially segregated into a smaller one occupied by Tt atoms (CN7) and a larger one occupied by Bi atoms (CN9). Band structure calculations on La 5 SiBi 2 confirm the importance of La-La bonding interactions near the Fermi level. X-ray photoelectron spectra support the presence of partially anionic Bi atoms, as indicated by a small negative binding energy shift relative to elemental Bi. The Ce and Pr members undergo magnetic transitions at low temperatures, possibly involving ferromagnetic interactions, that are strongly influenced by the nature of the Tt atom.
ChemInform, 2009
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform, 2008
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform, 2011
ABSTRACT The title compounds are prepared by arc-melting stoichiometric mixtures of the elements ... more ABSTRACT The title compounds are prepared by arc-melting stoichiometric mixtures of the elements with a 5—7 wt.% excess of Bi followed by annealing at 800 °C for at least two weeks.
ABSTRACT This thesis focuses on the synthesis, structures, and physical properties of ternary rar... more ABSTRACT This thesis focuses on the synthesis, structures, and physical properties of ternary rare-earth antimonides and germanides. These ternary compounds exhibit diverse polyanionic substructures with classical and non-classical Sb-Sb bonding, Ge-Ge bonding, or both. The Zintl-Klemm concept and band structure calculations were applied to understand their structures and bonding. Electrical resistivities and magnetic properties were measured for these compounds. The compounds RE2Ti7Sb12 (RE = La-Nd) and RE2Ti 11-xSb14+x (RE = Sm, Gd, Tb, Yb), which were synthesized by arc-melting, adopt different structures depending on the size of the RE atoms. Both consist of a complex arrangement of TiSb n polyhedra, linked to form a 3D framework with large cavities in which the RE atoms reside. Hypervalent Sb-Sb bonds are manifested in disordered Sb fragments in RE2Ti 7Sb12, and 1D linear chains, zig-zag chains, and pairs in RE2Ti11-xSb 14+x. A series of compounds, RECrGe3 ( RE = La-Nd, Sm), was synthesized by the Sn-flux method. They adopt a hexagonal perovskite structure type, in which chains of face-sharing Cr-centered octahedra are linked by triangular Ge3 clusters. These unusual single-bonded Ge3 substructures can be rationalized simply by the Zintl-Klemm concept. Electrical resistivity measurements show metallic behaviour with prominent transitions coincident with ferromagnetic transitions ( Tc ranging from 62 to 155 K) found in magnetic measurements. Band structure calculations show the presence of a narrow, partially filled band with high DOS at Ef, in agreement with the observation that LaCrSb3 is an itinerant ferromagnet. With a different number of d-electrons in the M site, the isostructural REVGe3 compounds exhibit antiferromagnetic behaviour. The doped quaternary compounds LaCr1-xV xGe3 and LaCr1-xMn xGe3 exhibit depressed Curie temperatures. The structures of RECrxGe 2 compounds (RE = Sm, Gd-Er) are built up by inserting transition-metal atoms into the square pyramidal sites of a hypothetical " REGe2" host structure (ZrSi2-type). The presence of extensive anionic Ge substructures in the form of 1D zigzag chains and 2D square sheets can be explained by the Zintl-Klemm concept. Magnetic measurements indicated antiferromagnetic ordering with low T N ranging from 3 to 17K. Compounds involving a p-block element as the second component were prepared. In RE12Ge7-xSb 21 (RE = La-Pr), a complex 3D polyanionic framework with Ge pairs, five-atom-wide Sb ribbons, and 2D Ge/Sb layers is present. The bonding exemplifies the competition of valence electron transfer from the RE atoms to metalloids with similar electronegativities. Full electron transfer from the RE atoms to the anionic substructure cannot be assumed. Magnetic measurements on Ce12Ge6.5Sb 21 indicate antiferromagnetic coupling. The metal-rich compounds RE5TtxSb3-x (Tt = Si, Ge) adopt the orthorhombic beta-Yb5Sb 3-type structure with a range of solid solubility of 0.9 ≤ x ≤ 1.6. They are not electron-precise and do not obey the Zintl-Klemm concept.
... 98 X. Zhu et al. ... Ellis III HV, McCann JL (eds) Lewis Publishers, Chelsea, UK, p 51 [4] Li... more ... 98 X. Zhu et al. ... Ellis III HV, McCann JL (eds) Lewis Publishers, Chelsea, UK, p 51 [4] Lindqvist O (1995) J Power Sources 57: 3 [5] Liu JF, Chao JB, Jiang GB (2002) Anal Chim Acta 455: 93 [6] Osamu K, Haeng-Boo K, Noboru K (2000) Anal Chim Acta 418: 129 [7] Zanjanchi MA ...