Trinath Mishra - Academia.edu (original) (raw)

Papers by Trinath Mishra

Zeitschrift für Naturforschung B, 2011

The ternary stannides RE 3 Ru 4 Sn 13 (RE = La, Ce, Pr, Nd) were obtained by arc-melting of the e... more The ternary stannides RE 3 Ru 4 Sn 13 (RE = La, Ce, Pr, Nd) were obtained by arc-melting of the elements. The polycrystalline samples were characterized by powder X-ray diffraction. The structures of three compounds were refined from single-crystal diffractometer data: Yb 3 Rh 4 Sn 13 type, Pm3n, a = 977.74(3) pm, wR2 = 0.0379, 280 F 2 values for La 3 Ru 4 Sn 13 , a = 971.34(9) pm, wR2 = 0.0333, 274 F 2 values for Ce 3 Ru 4 Sn 13 , a = 970.68(8) pm, wR2 = 0.0262, 272 F 2 values for Nd 3 Ru 4 Sn 13 with 13 variables per refinement. The structures consist of three-dimensional networks of condensed RuSn 6/2 trigonal prisms with the RE (CN 16) and Sn2 (CN 12) atoms in two different types of cavities of the networks. The two crystallographically independent tin sites have been resolved by 119 Sn Mössbauer spectroscopy. Temperature-dependent magnetic susceptibility measurements of Ce 3 Ru 4 Sn 13 gave a reduced magnetic moment of 2.32 µ B per Ce atom, indicating intermediate cerium valence. No magnetic ordering was evident down to 3 K.

ChemInform, Jul 28, 2014

The title compounds are prepared by reaction of silicon and carbon in either a Pr/Co or a Nd/Co e... more The title compounds are prepared by reaction of silicon and carbon in either a Pr/Co or a Nd/Co eutectic flux (alumina crucible, 950 °C, 12 h and 850 °C for 48 h).

ChemInform

The title compounds are prepared by reaction of silicon and carbon in either a Pr/Co or a Nd/Co e... more The title compounds are prepared by reaction of silicon and carbon in either a Pr/Co or a Nd/Co eutectic flux (alumina crucible, 950 °C, 12 h and 850 °C for 48 h).

ChemInform, 2014

ABSTRACT The title compounds are prepared by reaction of silicon and carbon in either a Pr/Co or ... more ABSTRACT The title compounds are prepared by reaction of silicon and carbon in either a Pr/Co or a Nd/Co eutectic flux (alumina crucible, 950 °C, 12 h and 850 °C for 48 h).

Inorg. Chem. Front., 2017

J Solid State Chem, 2009

The europium compounds EuTZn (T ¼ Pd, Pt, Au) were synthesized from the elements in sealed tantal... more The europium compounds EuTZn (T ¼ Pd, Pt, Au) were synthesized from the elements in sealed tantalum tubes in an induction furnace. These intermetallics crystallize with the orthorhombic TiNiSi-type structure, space group Pnma. The structures were investigated by X-ray diffraction on powders and single crystals: a ¼ 732.3(2), b ¼ 448.5(2), c ¼ 787.7(2) pm, R 1 /wR 2 ¼ 0.0400/0.0594, 565 F 2 values for EuPdZn, a ¼ 727.8(3), b ¼ 443.7(1), c ¼ 781.7(3) pm, R 1 /wR 2 ¼ 0.0605/0.0866, 573 F 2 values for EuPtZn, and a ¼ 747.4(2), b ¼ 465.8(2), c ¼ 789.1(4) pm, R 1 /wR 2 ¼ 0.0351/0.0590, 658 F 2 values for EuAuZn, with 20 variables per refinement. Together the T and zinc atoms build up three-dimensional [TZn] networks with short T-Zn distances. The EuTZn compounds show Curie-Weiss behavior in the temperature range from 75 to 300 K with m eff ¼ 7.97(1), 7.70(1), and 7.94(1) m B /Eu atom and y P ¼ 18.6(1), 34.9(1), and 55.5(1) K for T ¼ Pd, Pt, and Au, respectively, indicating divalent europium. Antiferromagntic ordering was detected at 15.1(3) K for EuPdZn and canted ferromagnetic ordering at 21.2(3) and 51.1(3) K for EuPtZn and EuAuZn. 151 Eu Mössbauer spectroscopic measurements confirm the divalent nature of the europium atoms by isomer shift values ranging from À8.22(8) (EuPtZn) to À9.23(2) mm/s (EuAuZn). At 4.2 K full magnetic hyperfine field splitting is observed in all three compounds due to magnetic ordering of the europium magnetic moments.

J Solid State Chem, 2009

The europium compounds EuTZn (T ¼ Pd, Pt, Au) were synthesized from the elements in sealed tantal... more The europium compounds EuTZn (T ¼ Pd, Pt, Au) were synthesized from the elements in sealed tantalum tubes in an induction furnace. These intermetallics crystallize with the orthorhombic TiNiSi-type structure, space group Pnma. The structures were investigated by X-ray diffraction on powders and single crystals: a ¼ 732.3(2), b ¼ 448.5(2), c ¼ 787.7(2) pm, R 1 /wR 2 ¼ 0.0400/0.0594, 565 F 2 values for EuPdZn, a ¼ 727.8(3), b ¼ 443.7(1), c ¼ 781.7(3) pm, R 1 /wR 2 ¼ 0.0605/0.0866, 573 F 2 values for EuPtZn, and a ¼ 747.4(2), b ¼ 465.8(2), c ¼ 789.1(4) pm, R 1 /wR 2 ¼ 0.0351/0.0590, 658 F 2 values for EuAuZn, with 20 variables per refinement. Together the T and zinc atoms build up three-dimensional [TZn] networks with short T-Zn distances. The EuTZn compounds show Curie-Weiss behavior in the temperature range from 75 to 300 K with m eff ¼ 7.97(1), 7.70(1), and 7.94(1) m B /Eu atom and y P ¼ 18.6(1), 34.9(1), and 55.5(1) K for T ¼ Pd, Pt, and Au, respectively, indicating divalent europium. Antiferromagntic ordering was detected at 15.1(3) K for EuPdZn and canted ferromagnetic ordering at 21.2(3) and 51.1(3) K for EuPtZn and EuAuZn. 151 Eu Mössbauer spectroscopic measurements confirm the divalent nature of the europium atoms by isomer shift values ranging from À8.22(8) (EuPtZn) to À9.23(2) mm/s (EuAuZn). At 4.2 K full magnetic hyperfine field splitting is observed in all three compounds due to magnetic ordering of the europium magnetic moments.

ChemInform, 2010

Complex Borides RERu 4 B 4 (RE: Ce, Pr, Nd, Sm)-Bonding Peculiarities and Magnetic Properties.-Th... more Complex Borides RERu 4 B 4 (RE: Ce, Pr, Nd, Sm)-Bonding Peculiarities and Magnetic Properties.-The title compounds are prepared by melting of the elements followed by annealing at 1300 K (4 h). The compounds are characterized by powder and single crystal XRD, DFT computations, and magnetic measurements. They crystallize in the space group I41/acd with Z = 8 (LuRu4B4-type structure). The structures contain Ru 4 tetrahedra and B 2 dumbbells with Ru-Ru and B-B distances of 271 and 180 pm in CeRu4B4. This compound behaves like a Pauli paramagnet with low room temperature susceptibility. Chemical bonding analyses reveals substantial RuB and B-B bonding within the [Ru4B4] substructure.

Journal of Solid State Chemistry, 2014

Zeitschrift für Naturforschung B, 2011

The hexagonal Laves phase Ce2RuAl3 (≡ CeRu0.5Al1.5) was synthesized by high-frequencemelting of t... more The hexagonal Laves phase Ce2RuAl3 (≡ CeRu0.5Al1.5) was synthesized by high-frequencemelting of the elements in a sealed tantalum tube and subsequent annealing. The structure was refined from single-crystal X-ray diffraction data: MgZn2 type, P63/mmc, Z = 2, a = 565.38(9), c = 888.3(1) pm, wR2 = 0.0231, 193 F2 values and 13 parameters. The 2a (0.824 Ru + 0.176 Al) and 6h (0.956 Al + 0.044 Ru) Wyckoff positions show mixed occupancies leading to the composition CeRu0.48Al1.52 for the investigated crystal. The aluminum atoms build up Kagomé networks at z = 1/4 and z = 3/4 which are connected to a three-dimensional network by the ruthenium atoms. The cerium atoms fill cavities of coordination number 16 (3 Ru + 9 Al + 4 Ce) within the [RuAl3] network. The Ce2RuAl3 sample orders ferromagnetically at TC = 8.0(1) K. The cerium-rich aluminide Ce5Ru3Al2 shows unusually short Ce-Ru distances of 253 and 260 pm for the Ce1 position as a result of intermediate cerium valence. The structural distortions are discussed on the basis of a group-subgroup scheme for Pr5Ru3Al2 (space group I213) and the superstructure variant Ce5Ru3Al2 (space group R3).

Zeitschrift für Naturforschung B, 2011

The equiatomic rare earth compounds REPtZn (RE = Y, Pr, Nd, Gd-Tm) were synthesized from the elem... more The equiatomic rare earth compounds REPtZn (RE = Y, Pr, Nd, Gd-Tm) were synthesized from the elements in sealed tantalum tubes by high-frequency melting at 1500 K followed by annealing at 1120 K and quenching. The samples were characterized by powder X-ray diffraction. The structures of four crystals were refined from single-crystal diffractometer data: TiNiSi type, Pnma, a = 707.1(1), b = 430.0(1), c = 812.4(1) pm, wR2 = 0.066, 602 F2, 21 variables for PrPt1.056Zn0.944; a = 695.2(1), b = 419.9(1), c = 804.8(1) pm, wR2 = 0.041, 522 F2, 21 variables for GdPt0.941Zn1.059; a = 688.2(1), b = 408.1(1), c = 812.5(1) pm, wR2 = 0.041, 497 F2, 22 variables for HoPt1.055Zn0.945; a = 686.9(1), b = 407.8(1), c = 810.4(1) pm, wR2 = 0.061, 779 F2, 20 variables for ErPtZn. The single-crystal data indicate small homogeneity ranges REPt1±xZn1±x. The platinum and zinc atoms build up three-dimensional [PtZn] networks (265 - 269 pm Pt-Zn in ErPtZn) in which the erbium atoms fill cages with coordination number 16 (6 Pt + 6 Zn + 4 Er). Bonding of the erbium atoms to the [PtZn] network proceeds via shorter RE-Pt distances, i. e. 288 - 293 pm in ErPtZn.

Zeitschrift für Naturforschung B, 2011

The ternary stannides RE 3 Ru 4 Sn 13 (RE = La, Ce, Pr, Nd) were obtained by arc-melting of the e... more The ternary stannides RE 3 Ru 4 Sn 13 (RE = La, Ce, Pr, Nd) were obtained by arc-melting of the elements. The polycrystalline samples were characterized by powder X-ray diffraction. The structures of three compounds were refined from single-crystal diffractometer data: Yb 3 Rh 4 Sn 13 type, Pm3n, a = 977.74(3) pm, wR2 = 0.0379, 280 F 2 values for La 3 Ru 4 Sn 13 , a = 971.34(9) pm, wR2 = 0.0333, 274 F 2 values for Ce 3 Ru 4 Sn 13 , a = 970.68(8) pm, wR2 = 0.0262, 272 F 2 values for Nd 3 Ru 4 Sn 13 with 13 variables per refinement. The structures consist of three-dimensional networks of condensed RuSn 6/2 trigonal prisms with the RE (CN 16) and Sn2 (CN 12) atoms in two different types of cavities of the networks. The two crystallographically independent tin sites have been resolved by 119 Sn Mössbauer spectroscopy. Temperature-dependent magnetic susceptibility measurements of Ce 3 Ru 4 Sn 13 gave a reduced magnetic moment of 2.32 µ B per Ce atom, indicating intermediate cerium valence. No magnetic ordering was evident down to 3 K.

ChemInform, Jul 28, 2014

The title compounds are prepared by reaction of silicon and carbon in either a Pr/Co or a Nd/Co e... more The title compounds are prepared by reaction of silicon and carbon in either a Pr/Co or a Nd/Co eutectic flux (alumina crucible, 950 °C, 12 h and 850 °C for 48 h).

ChemInform

The title compounds are prepared by reaction of silicon and carbon in either a Pr/Co or a Nd/Co e... more The title compounds are prepared by reaction of silicon and carbon in either a Pr/Co or a Nd/Co eutectic flux (alumina crucible, 950 °C, 12 h and 850 °C for 48 h).

ChemInform, 2014

ABSTRACT The title compounds are prepared by reaction of silicon and carbon in either a Pr/Co or ... more ABSTRACT The title compounds are prepared by reaction of silicon and carbon in either a Pr/Co or a Nd/Co eutectic flux (alumina crucible, 950 °C, 12 h and 850 °C for 48 h).

Inorg. Chem. Front., 2017

J Solid State Chem, 2009

The europium compounds EuTZn (T ¼ Pd, Pt, Au) were synthesized from the elements in sealed tantal... more The europium compounds EuTZn (T ¼ Pd, Pt, Au) were synthesized from the elements in sealed tantalum tubes in an induction furnace. These intermetallics crystallize with the orthorhombic TiNiSi-type structure, space group Pnma. The structures were investigated by X-ray diffraction on powders and single crystals: a ¼ 732.3(2), b ¼ 448.5(2), c ¼ 787.7(2) pm, R 1 /wR 2 ¼ 0.0400/0.0594, 565 F 2 values for EuPdZn, a ¼ 727.8(3), b ¼ 443.7(1), c ¼ 781.7(3) pm, R 1 /wR 2 ¼ 0.0605/0.0866, 573 F 2 values for EuPtZn, and a ¼ 747.4(2), b ¼ 465.8(2), c ¼ 789.1(4) pm, R 1 /wR 2 ¼ 0.0351/0.0590, 658 F 2 values for EuAuZn, with 20 variables per refinement. Together the T and zinc atoms build up three-dimensional [TZn] networks with short T-Zn distances. The EuTZn compounds show Curie-Weiss behavior in the temperature range from 75 to 300 K with m eff ¼ 7.97(1), 7.70(1), and 7.94(1) m B /Eu atom and y P ¼ 18.6(1), 34.9(1), and 55.5(1) K for T ¼ Pd, Pt, and Au, respectively, indicating divalent europium. Antiferromagntic ordering was detected at 15.1(3) K for EuPdZn and canted ferromagnetic ordering at 21.2(3) and 51.1(3) K for EuPtZn and EuAuZn. 151 Eu Mössbauer spectroscopic measurements confirm the divalent nature of the europium atoms by isomer shift values ranging from À8.22(8) (EuPtZn) to À9.23(2) mm/s (EuAuZn). At 4.2 K full magnetic hyperfine field splitting is observed in all three compounds due to magnetic ordering of the europium magnetic moments.

J Solid State Chem, 2009

The europium compounds EuTZn (T ¼ Pd, Pt, Au) were synthesized from the elements in sealed tantal... more The europium compounds EuTZn (T ¼ Pd, Pt, Au) were synthesized from the elements in sealed tantalum tubes in an induction furnace. These intermetallics crystallize with the orthorhombic TiNiSi-type structure, space group Pnma. The structures were investigated by X-ray diffraction on powders and single crystals: a ¼ 732.3(2), b ¼ 448.5(2), c ¼ 787.7(2) pm, R 1 /wR 2 ¼ 0.0400/0.0594, 565 F 2 values for EuPdZn, a ¼ 727.8(3), b ¼ 443.7(1), c ¼ 781.7(3) pm, R 1 /wR 2 ¼ 0.0605/0.0866, 573 F 2 values for EuPtZn, and a ¼ 747.4(2), b ¼ 465.8(2), c ¼ 789.1(4) pm, R 1 /wR 2 ¼ 0.0351/0.0590, 658 F 2 values for EuAuZn, with 20 variables per refinement. Together the T and zinc atoms build up three-dimensional [TZn] networks with short T-Zn distances. The EuTZn compounds show Curie-Weiss behavior in the temperature range from 75 to 300 K with m eff ¼ 7.97(1), 7.70(1), and 7.94(1) m B /Eu atom and y P ¼ 18.6(1), 34.9(1), and 55.5(1) K for T ¼ Pd, Pt, and Au, respectively, indicating divalent europium. Antiferromagntic ordering was detected at 15.1(3) K for EuPdZn and canted ferromagnetic ordering at 21.2(3) and 51.1(3) K for EuPtZn and EuAuZn. 151 Eu Mössbauer spectroscopic measurements confirm the divalent nature of the europium atoms by isomer shift values ranging from À8.22(8) (EuPtZn) to À9.23(2) mm/s (EuAuZn). At 4.2 K full magnetic hyperfine field splitting is observed in all three compounds due to magnetic ordering of the europium magnetic moments.

ChemInform, 2010

Complex Borides RERu 4 B 4 (RE: Ce, Pr, Nd, Sm)-Bonding Peculiarities and Magnetic Properties.-Th... more Complex Borides RERu 4 B 4 (RE: Ce, Pr, Nd, Sm)-Bonding Peculiarities and Magnetic Properties.-The title compounds are prepared by melting of the elements followed by annealing at 1300 K (4 h). The compounds are characterized by powder and single crystal XRD, DFT computations, and magnetic measurements. They crystallize in the space group I41/acd with Z = 8 (LuRu4B4-type structure). The structures contain Ru 4 tetrahedra and B 2 dumbbells with Ru-Ru and B-B distances of 271 and 180 pm in CeRu4B4. This compound behaves like a Pauli paramagnet with low room temperature susceptibility. Chemical bonding analyses reveals substantial RuB and B-B bonding within the [Ru4B4] substructure.

Journal of Solid State Chemistry, 2014

Zeitschrift für Naturforschung B, 2011

The hexagonal Laves phase Ce2RuAl3 (≡ CeRu0.5Al1.5) was synthesized by high-frequencemelting of t... more The hexagonal Laves phase Ce2RuAl3 (≡ CeRu0.5Al1.5) was synthesized by high-frequencemelting of the elements in a sealed tantalum tube and subsequent annealing. The structure was refined from single-crystal X-ray diffraction data: MgZn2 type, P63/mmc, Z = 2, a = 565.38(9), c = 888.3(1) pm, wR2 = 0.0231, 193 F2 values and 13 parameters. The 2a (0.824 Ru + 0.176 Al) and 6h (0.956 Al + 0.044 Ru) Wyckoff positions show mixed occupancies leading to the composition CeRu0.48Al1.52 for the investigated crystal. The aluminum atoms build up Kagomé networks at z = 1/4 and z = 3/4 which are connected to a three-dimensional network by the ruthenium atoms. The cerium atoms fill cavities of coordination number 16 (3 Ru + 9 Al + 4 Ce) within the [RuAl3] network. The Ce2RuAl3 sample orders ferromagnetically at TC = 8.0(1) K. The cerium-rich aluminide Ce5Ru3Al2 shows unusually short Ce-Ru distances of 253 and 260 pm for the Ce1 position as a result of intermediate cerium valence. The structural distortions are discussed on the basis of a group-subgroup scheme for Pr5Ru3Al2 (space group I213) and the superstructure variant Ce5Ru3Al2 (space group R3).

Zeitschrift für Naturforschung B, 2011

The equiatomic rare earth compounds REPtZn (RE = Y, Pr, Nd, Gd-Tm) were synthesized from the elem... more The equiatomic rare earth compounds REPtZn (RE = Y, Pr, Nd, Gd-Tm) were synthesized from the elements in sealed tantalum tubes by high-frequency melting at 1500 K followed by annealing at 1120 K and quenching. The samples were characterized by powder X-ray diffraction. The structures of four crystals were refined from single-crystal diffractometer data: TiNiSi type, Pnma, a = 707.1(1), b = 430.0(1), c = 812.4(1) pm, wR2 = 0.066, 602 F2, 21 variables for PrPt1.056Zn0.944; a = 695.2(1), b = 419.9(1), c = 804.8(1) pm, wR2 = 0.041, 522 F2, 21 variables for GdPt0.941Zn1.059; a = 688.2(1), b = 408.1(1), c = 812.5(1) pm, wR2 = 0.041, 497 F2, 22 variables for HoPt1.055Zn0.945; a = 686.9(1), b = 407.8(1), c = 810.4(1) pm, wR2 = 0.061, 779 F2, 20 variables for ErPtZn. The single-crystal data indicate small homogeneity ranges REPt1±xZn1±x. The platinum and zinc atoms build up three-dimensional [PtZn] networks (265 - 269 pm Pt-Zn in ErPtZn) in which the erbium atoms fill cages with coordination number 16 (6 Pt + 6 Zn + 4 Er). Bonding of the erbium atoms to the [PtZn] network proceeds via shorter RE-Pt distances, i. e. 288 - 293 pm in ErPtZn.