M. Multigner - Academia.edu (original) (raw)
Papers by M. Multigner
Journal of the Mechanical Behavior of Biomedical Materials, 2016
Materials Science Forum, 1998
ABSTRACT Starting from four different FeRh compositions, a nanocrystalline fcc phase, paramagneti... more ABSTRACT Starting from four different FeRh compositions, a nanocrystalline fcc phase, paramagnetic at room temperature, has been obtained, for each case, through mechanical alloying by ball-milling. The starting selected compositions were: ferromagnetic and bcc-ordered Fe65Rh35, antiferromagnetic and also bcc-ordered Fe50Rh50, paramagnetic and fcc Fe28Rh72 and Fe26Rh74. The average grain size of the resulting fee phase has been found to vary in the 6-12 nm range, depending on the Rh content of the precursor. At low temperatures, some characteristic behaviors typical of the spin-glass or superparamagnetic state have been observed in all the compositions: a maximum in the AC susceptibility, at a temperature (Tm) which increases with the grain size, a maximum in the measurements of the thermal variation of the ZFC and FC magnetization and a wide distribution of hyperfine fields in the Mössbauer spectra at T<Tm. The possibility that this behavior could be determined by the presence of iron impurities, deriving from the stainless steel vial and balls used for the milling procedure, has been definitely removed since similar effects have been also observed in samples milled in a vial and with balls of agate. However, the analysis of the dc field-cooled magnetization measurements, revealing the absence of any critical behavior of the non-linear susceptibility first coefficient in the vicinity of Tm, rules out the possibility of a true spin-glass state. Actually, all the results seem to indicate that the observed behavior is intrinsic to the nanocrystalline nature of fee FeRh.
The Journal of Physical Chemistry C, 2012
Solid State Communications, 2004
... procedures. Samples CuO3 and CuO5 were synthesized through a solid-state reaction at room tem... more ... procedures. Samples CuO3 and CuO5 were synthesized through a solid-state reaction at room temperature [15] by grinding 2:5 and 3:1 molar ratios, respectively, of CuCl 2 ·H 2 O and NaOH in an agate mortar for 30 min. The ...
Journal of Magnetism and Magnetic Materials, 2007
Europhysics Letters (EPL), 1996
Le Journal de Physique IV, 1997
Applied Physics Letters, 1996
ABSTRACT
IEEE Transactions on Magnetics, 1995
Journal of Alloys and Compounds, 2016
Abstract This work deals with the surface modification of 316LVM stainless steel by Si + ion impl... more Abstract This work deals with the surface modification of 316LVM stainless steel by Si + ion implantation and the in vitro study of its effect on the short-term corrosion behaviour and ion release. In order to achieve a high Si content close to the surface, the experimental set up was designed with different implantation doses, acceleration voltages and angles of incidence. Corrosion tests were carried out by Electrochemical Impedance Spectroscopy (EIS). A special feature of this paper is the evaluation of the EIS data obtained through a critical analysis of the existing equivalent electrical circuits, in order to establish adequate parameters and scientific criteria to propose a classification of the corrosion response of the investigated surfaces. It has been demonstrated that doses of Si + ion implantation equal to 2.5 × 10 16 ion/cm 2 and an acceleration voltages of 50 keV enhanced the corrosion protection. In contrast, higher ion-implantation dose (1 × 10 17 ion/cm 2 ) and acceleration voltage (80 keV) produced worse results, probably due to the development of strain induced α’-martensite. The quantity of relevant ions (Cr, Fe, Mn, Mo, Ni and Si) released to the medium was determined by an optimized Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES) method. It has been shown that a better corrosion resistance is accompanied by a reduction in the amount of ions released.
Revista de Metalurgia, 2009
Materials Science and Engineering: C, 2011
The colonization of an implant surface by bacteria is an extremely important medical problem, whi... more The colonization of an implant surface by bacteria is an extremely important medical problem, which often leads to the failure of medical devices. Modern surface modification techniques, such as ion implantation, can confer to the surfaces very different properties from those of the bulk underlying material. In this work, austenitic stainless steel 316 LVM has been superficially modified by Si+
Physical Review B, 1996
... Phys. 73, 6600 1993. 9 A. Hernando, M. Vázquez, T. Kulik, and C. Prados, Phys. Rev. B 51, 358... more ... Phys. 73, 6600 1993. 9 A. Hernando, M. Vázquez, T. Kulik, and C. Prados, Phys. Rev. B 51, 3581 1995. 10 A. Slawska-Wanieska, P. Nowicki, HK Lachowicz, P. Gorria, J. M. Barandiarán, and A. Hernando, Phys. Rev. B 50, 6465 1994. ...
Journal of Metastable and Nanocrystalline Materials, 2000
Journal of the Mechanical Behavior of Biomedical Materials, 2016
Materials Science Forum, 1998
ABSTRACT Starting from four different FeRh compositions, a nanocrystalline fcc phase, paramagneti... more ABSTRACT Starting from four different FeRh compositions, a nanocrystalline fcc phase, paramagnetic at room temperature, has been obtained, for each case, through mechanical alloying by ball-milling. The starting selected compositions were: ferromagnetic and bcc-ordered Fe65Rh35, antiferromagnetic and also bcc-ordered Fe50Rh50, paramagnetic and fcc Fe28Rh72 and Fe26Rh74. The average grain size of the resulting fee phase has been found to vary in the 6-12 nm range, depending on the Rh content of the precursor. At low temperatures, some characteristic behaviors typical of the spin-glass or superparamagnetic state have been observed in all the compositions: a maximum in the AC susceptibility, at a temperature (Tm) which increases with the grain size, a maximum in the measurements of the thermal variation of the ZFC and FC magnetization and a wide distribution of hyperfine fields in the Mössbauer spectra at T<Tm. The possibility that this behavior could be determined by the presence of iron impurities, deriving from the stainless steel vial and balls used for the milling procedure, has been definitely removed since similar effects have been also observed in samples milled in a vial and with balls of agate. However, the analysis of the dc field-cooled magnetization measurements, revealing the absence of any critical behavior of the non-linear susceptibility first coefficient in the vicinity of Tm, rules out the possibility of a true spin-glass state. Actually, all the results seem to indicate that the observed behavior is intrinsic to the nanocrystalline nature of fee FeRh.
The Journal of Physical Chemistry C, 2012
Solid State Communications, 2004
... procedures. Samples CuO3 and CuO5 were synthesized through a solid-state reaction at room tem... more ... procedures. Samples CuO3 and CuO5 were synthesized through a solid-state reaction at room temperature [15] by grinding 2:5 and 3:1 molar ratios, respectively, of CuCl 2 ·H 2 O and NaOH in an agate mortar for 30 min. The ...
Journal of Magnetism and Magnetic Materials, 2007
Europhysics Letters (EPL), 1996
Le Journal de Physique IV, 1997
Applied Physics Letters, 1996
ABSTRACT
IEEE Transactions on Magnetics, 1995
Journal of Alloys and Compounds, 2016
Abstract This work deals with the surface modification of 316LVM stainless steel by Si + ion impl... more Abstract This work deals with the surface modification of 316LVM stainless steel by Si + ion implantation and the in vitro study of its effect on the short-term corrosion behaviour and ion release. In order to achieve a high Si content close to the surface, the experimental set up was designed with different implantation doses, acceleration voltages and angles of incidence. Corrosion tests were carried out by Electrochemical Impedance Spectroscopy (EIS). A special feature of this paper is the evaluation of the EIS data obtained through a critical analysis of the existing equivalent electrical circuits, in order to establish adequate parameters and scientific criteria to propose a classification of the corrosion response of the investigated surfaces. It has been demonstrated that doses of Si + ion implantation equal to 2.5 × 10 16 ion/cm 2 and an acceleration voltages of 50 keV enhanced the corrosion protection. In contrast, higher ion-implantation dose (1 × 10 17 ion/cm 2 ) and acceleration voltage (80 keV) produced worse results, probably due to the development of strain induced α’-martensite. The quantity of relevant ions (Cr, Fe, Mn, Mo, Ni and Si) released to the medium was determined by an optimized Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES) method. It has been shown that a better corrosion resistance is accompanied by a reduction in the amount of ions released.
Revista de Metalurgia, 2009
Materials Science and Engineering: C, 2011
The colonization of an implant surface by bacteria is an extremely important medical problem, whi... more The colonization of an implant surface by bacteria is an extremely important medical problem, which often leads to the failure of medical devices. Modern surface modification techniques, such as ion implantation, can confer to the surfaces very different properties from those of the bulk underlying material. In this work, austenitic stainless steel 316 LVM has been superficially modified by Si+
Physical Review B, 1996
... Phys. 73, 6600 1993. 9 A. Hernando, M. Vázquez, T. Kulik, and C. Prados, Phys. Rev. B 51, 358... more ... Phys. 73, 6600 1993. 9 A. Hernando, M. Vázquez, T. Kulik, and C. Prados, Phys. Rev. B 51, 3581 1995. 10 A. Slawska-Wanieska, P. Nowicki, HK Lachowicz, P. Gorria, J. M. Barandiarán, and A. Hernando, Phys. Rev. B 50, 6465 1994. ...
Journal of Metastable and Nanocrystalline Materials, 2000