Ab initio structure determination of new boride CePt3B, a distorted variant of CaTiO3

Ab initio structure determination of new boride CePt3B, a distorted variant of CaTiO3
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新型硼化物 CePt3B(CaTiO3 的变形变体)的从头算结构测定

DOI:
10.1016/s0925-8388(01)01913-2
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发表时间:
2002
影响因子:
6.2
通讯作者:
C. Godart
C. Godart
中科院分区:
材料科学2区
文献类型:
--
作者:
O. Sologub;J. Hester;P. Salamakha;E. Leroy;C. Godart

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采用x射线粉末衍射、同步辐射、光学金相检验和电子探针显微分析(EPMA)等方法从头开始测定了新型三元硼化物CePt3B的晶体结构,为四边形,空间群P4mm (N99), a=4.00433(18) Å, c=5.07547(7) Å, Z=1, V=81.383(5) Å3was。对成分为ce20pd60b20的样品进行Rietveld细化,发现存在两相,95%立方的CePd3Bx, x=0.6(空间群Pm-3m), CaTiO3str。类型,a=4.19350(11) Å)和5%的CeB6(空间组Pm-3m, CaB6str。类型,a=4.1389(2) Å)。磁化率测量和x射线吸收光谱表明,Ce在CePt3B中处于三价态,并且该化合物在2k时不有序。
The crystal structure of the new ternary boride CePt3B, tetragonal, space group P4mm (N99), a=4.00433(18) Å, c=5.07547(7) Å, Z=1, V=81.383(5) Å3was determined ab initio from X-ray powder diffraction using conventional and synchrotron radiation, optical metallographic examination and electron probe micro-analysis (EPMA). Rietveld refinement on the sample with composition Ce20Pd60B20revealed the presence of two phases, 95% of cubic CePd3Bx, x=0.6 (space group Pm-3m, CaTiO3str. type, a=4.19350(11) Å) and 5% of CeB6(space group Pm-3m, CaB6str. type, a=4.1389(2) Å). Magnetic susceptibility measurements and X-ray absorption spectroscopy show that Ce is in a trivalent state in CePt3B and that the compound does not order magnetically at 2 K.