Sr6Mg7H26, a new saline high-pressure hydride with Ba6Zn7F26-type structure
作者： B. Bertheville , H. Kohlmann , D. Sheptyakov , K. Yvon
DOI: 10.1016/S0925-8388(03)00100-2
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摘要: Abstract Sr6Mg7H26 and its deuteride have been synthesized at high pressure (25 kbar) temperature (900 K) from mixtures of the corresponding binary hydrides (deuterides). Structure refinements on X-ray neutron powder diffraction data show a monoclinic Ba6Zn7F26 type structure (space group I2/m, a=14.254(2) A, b=5.6711(4) c=11.575(1) β=90.59(1)°, deuteride, T=293 K). The four magnesium atoms nearly octahedral deuterium coordinations with average bond distances Mg–D=1.97, 1.97, 1.96 1.85 A. three strontium sites 10- 11-fold coordination Sr–D=2.66 (CN=10), 2.71 (CN=11) 2.62 A (CN=10). latter are longer by ∼0.07 average, than Eu–D in europium analogue, thus underlining structural analogy between Sr- Eu-based metal hydrides.
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