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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Crystal structures of CaBe2Ge2 and CeMg2Si2 analogous units: the phosphides LnPt(2)P(2-X) (Ln : la, sm)
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Crystal structures of CaBe2Ge2 and CeMg2Si2 analogous units: the phosphides LnPt(2)P(2-X) (Ln : la, sm)

机译:CaBe2Ge2和CeMg2Si2类似单位的晶体结构:磷化物LnPt(2)P(2-X)(Ln:la,sm)

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摘要

Single crystals of LaPt2P1.44 (a = 4.174(1), c = 19.212(5) A) were grown by reaction of vaporous phosphorus with LaPt2 at 1050 C during two weeks, whereas SmPt2P1.50 (4.131(1), c = 19.086(4) angstrom) was synthesized by heating mixtures of the elements at 900 and 1100 C (60 h) and annealing at 1050 C (300 h). Both phosphides were investigated by single crystal X-ray methods. Their crystal structures (14/mmm; Z = 4) consist of CaBe2Ge2 and CeMg2Si2 analogous units alternating with each other along [001]. The positions of the PI atoms are occupied incompletely causing the deviation to the 1:2:2 stoichiometry. Another compounds LnPt(2)P(2-x) were studied by X-ray powder diffraction resulting in the following lattice constants: a = 4.150(1), c = 19.132(5) angstrom for CePt2P2-x, a = 4.137(1), c = 19.085(4) angstrom for PrPt2P2-x, and a = 4.127(1), c = 19.040(2) angstrom for NdPt2P2-x.
机译:LaPt2P1.44(a = 4.174(1),c = 19.212(5)A)的单晶是通过水蒸气中的磷与LaPt2在1050°C下反应两周而生长的,而SmPt2P1.50(4.131(1),c =通过在900和1100 C(60 h)加热元素的混合物并在1050 C(300 h)退火来合成19.086(4)埃。通过单晶X射线方法研究了两种磷化物。它们的晶体结构(14 / mmm; Z = 4)由CaBe2Ge2和CeMg2Si2类似单元沿[001]交替排列。 PI原子的位置未完全占据,导致化学计量比偏离了1:2:2。通过X射线粉末衍射研究了另一种化合物LnPt(2)P(2-x),得到以下晶格常数:CePt2P2-x的a = 4.150(1),c = 19.132(5)埃,a = 4.137( 1),对于PrPt2P2-x,c = 19.085(4)埃,对于ndPt2P2-x,a = 4.127(1),c = 19.040(2)埃。

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