The crystal structures of EuH2 and EuLiH3 by neutron powder diffraction
The crystal structures of EuH2 and EuLiH3 by neutron powder diffraction
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中子粉末衍射法研究 EuH2 和 EuLiH3 的晶体结构
DOI：
10.1016/s0925-8388(99)00818-x
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发表时间：
2000
影响因子：
6.2
通讯作者：
K. Yvon
中科院分区：
文献类型：
--
作者：
H. Kohlmann;K. Yvon
采用固-气反应法制备了EuH_2，采用固-固反应法制备了EuLiH_3。它们的结构已被调查的氘化物的中子粉末衍射的波长接近最小的天然同位素混合物的铕的中子吸收截面。EuD 2以正交PbCl 2型结构（空间群Pnma，a=623.9（2），B=379.6（1），c=719.6（2）pm，Z=4）结晶，EuLiD 3以立方反钙钛矿型结构（空间群Pm 3 μ m，a=378.75（5）pm，Z=1）结晶。这两种氘化物的特征在于二价铕和完全占据的氘位点。EuD 2中的Eu-D距离为255 pm（平均超过9倍Eu配位），EuLiD 3中的Eu-D距离为268 pm（12倍Eu配位）。
EuH2has been prepared by solid–gas and EuLiH3by solid–solid reaction. Their structures have been investigated by neutron powder diffraction on the deuterides at a wavelength close to the minimum of the neutron absorption cross-section of a natural isotope mixture of europium. EuD2crystallises with the orthorhombic PbCl2-type structure (space group Pnma, a=623.9(2), b=379.6(1), c=719.6(2) pm, Z=4), and EuLiD3with the cubic inverse perovskite type structure (space group Pm3̄m, a=378.75(5) pm, Z=1). Both deuterides are characterised by divalent europium and fully occupied deuterium sites. The Eu–D distances in EuD2are 255 pm (average over 9-fold Eu co-ordination) and those in EuLiD3are 268 pm (12-fold Eu co-ordination).