12196-72-4Relevant articles and documents
Electrical and thermal transport in CeNi and LaNi
Rudajevová, Alexandra,Vasylyev, Denis,Musil, Ond?ej
, p. 758 - 759 (2006)
We have measured the electrical resistivity and thermal conductivity of CeNi, LaNi and La 0.15Ce 0.85Ni in the temperature range 4-400 K simultaneously on the same specimen using the TTO option in PPMS (Quantum Design) facility. Anom
Effect of sintering conditions on the formation of single-phase NdMgNi4 compound and its hydrogen storage properties
Wang,Zhou, Huaiying,Zou,Yao, Qingrong
, p. 260 - 263 (2007)
Effects of different sintering conditions on the formation of single-phase NdMgNi4 compound and its electrochemical properties have been investigated. XRD analysis shows that an ideal single-phase compound of NdMgNi4 can be synthesized by sintering the pressed tablets of mixture of Mg, Ni and NdNi powders under 973 K for 5 h; single-phase compounds of REMgNi4 (RE = La, Ce, Pr) can be synthesized in this way as well. The electrochemical properties were measured by simulated battery tests. The maximum discharge capacity of NdMgNi4 compound was about 200 mAh/g, and just 78 mAh/g for CeMgNi4 compound. NdMgNi4 compound could store 3.5 H/M of hydrogen under 2.5 MPa at 298 K, whilst it is difficult to absorb hydrogen at a higher temperature (473 K).
Maeland, Arnulf J.,Andresen, Arne F.,Videm, Kjetil
, p. 347 - 350 (1976)
Effect of chemical and external pressure on the structure of intermetallic compound CeNi
Mirmelstein,Clementyev,Voronin,Akshentsev,Kozlenko,Kutepov,Petrovtsev,Zuev
, p. 281 - 284 (2007)
Neutron powder diffraction was employed to study the structural modifications of the intermediate-valence compound CeNi at room temperature induced by either chemical or external pressure. For the first time we were able to record the diffraction pattern resulting from the pressure-induced first-order phase transition occurring in CeNi at 300 K. At pressure P = 2 GPa we observe the coexistence of two phases while only single pressure-induced phase is visible at P = 5 GPa. The results obtained are indicative of a higher symmetry of the collapsed structure as compared to the CrB-type ambient pressure structure of CeNi. The critical pressure range around 2 GPa is found to be agreement with the previous estimation derived from the thermopower measurements.
Fuggle, J. C.,Hillebrecht, F. U.,Zolnierek, Z.,Laesser, R.,Freiburg, Ch.,et al.
, (1983)
The 673 K isothermal section of the La-Ni-Sn ternary system
Zhuang, Yinghong,Deng, Haixia,Liu, Jingqi,Yao, Qingrong
, p. 223 - 226 (2004)
The phase relationships in the La-Ni-Sn ternary system at 673 K have been investigated by means of X-ray powder diffraction (XRD), differential thermal analysis (DTA), scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). Most of this ternary system was studied at 673 K. At this temperature, a new ternary compound whose atomic ratio is close to La/Ni/Sn = 1:1:3 has been found. The existences of 15 binary compounds La 7Ni3, LaNi, La2Ni3, La 7Ni16, LaNi3, La2Ni7, LaNi5, Ni3Sn, Ni3Sn2, Ni 3Sn4, La5Sn3, La5Sn 4, LaSn, La3Sn5, LaSn3 and seven other ternary compounds LaNi5Sn, LaNi4Sn2, LaNi2Sn2, La3Ni2Sn6, La3Ni2Sn7, La3Ni8Sn 16, LaNiSn have been confirmed too. There are 31 three-phase regions in the 673 K isothermal section. Due to the lower melting point of Sn (about 504 K), a small part of the ternary system that lies in the Sn-rich part was studied at 483 K.
Hillebrecht, F. U.,Fuggle, J. C.,Sawatzky, G. A.,Campagna, M.,Gunnarsson, O.,Schoenhammer, K.
, (1984)
Synthesis, crystal structure and hydrogenation properties of the novel metal compound LaNi2Mn3
Guénée,Yvon, Klaus
, p. 176 - 183 (2003)
LaNi2Mn3 has been synthesised from the elements and investigated with respect to crystal structure and hydrogenation properties. Single crystal X-ray diffraction reveals a YNi2Al3 type structure (space group P6/mmm, a = 9.2099(9), c = 4.1892(4) ?, c/a = 0.4548) that is distinctly different from the CaCu5 type structure of LaNi5. The compound absorbs reversibly up to six hydrogen atoms per formula unit near ambient conditions and shows a hydrogen plateau pressure of ～1 bar near 60 °C. The hydrogen atoms in the expanded metal atom structure were localised by neutron powder diffraction on deuterides of composition LaNi2Mn3D4.6 (a = 9.7125(2), c = 4.3057(1) ?, c/a = 0.4433) and LaNi2Mn3D5.6 (a = 9.8379(2), c = 4.3038(1), c/a = 0.4375). They occupy one octahedral coordinated site [La2Mn4] with full occupancy and three tetrahedral coordinated sites [La2Mn2], [La2NiMn] and [LaMn2Ni], and a deformed square pyramidal coordinated site [LaMn2Ni2] with partial occupancies. Elsevier Science B.V. All rights reserved.
Formation of Kondo lattice in La1-xCexNi
Isikawa, Yosikazu,Mori, Katsunori,Fujii, Akiyoshi,Sato, Kiyoo
, p. 3165 - 3173 (1986)
Temperature dependences of the resistivity and the susceptibility of single crystals of solid solution La1-x CexNi have been measured in the temperature range 2-300 K. We have obtained a phase diagram of La 1-x CexNi which is consisted of three parts; (1) isolated Kondo region (xa localized trivalent state, (2) fairly isolated dense Kondo region (x>0.6 and high temperature region), where the 4f electron behaves as fairly localized electron although the valence of the Ce ion is more than three and (3) Kondo lattice region (x>0.6 and low temperature region), where the 4f state becomes a delocalized state.
