X-ray powder diffraction analysis of a new magnesium chromate hydrate,MgCrO_411H_2O

A. Dominic Fortes; Ian G. Wood

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X-ray powder diffraction analysis of a new magnesium chromate hydrate,MgCrO_411H_2O

机译：一种新型铬酸镁水合物MgCrO_411H_2O的X射线粉末衍射分析

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A new hydrate of magnesium chromate is synthesized by quenching aqueous solutions of MgCrO_4 in liquid nitrogen. MgCrO_411H_2O is isostructural with the rare mineral meridianiite (MgSO_4·11H_2O) being triclinic, P1, Z=2, with unit-cell parameters a = 6.811 33(8) A, b = 6.958 39(9) A, c = 17.3850(2) A, α= 87.920(1)°, β= 89.480(1)°, γ = 62.772(1)°, and V= 732.17(1) A3 at -15℃. The difference in unit-cell parameters between SO_4- and CrO_4-bearing species is only partially accounted for by the difference in S-O and Cr-0 bond lengths; the remainder of the difference (over 90% in the cell volume) is attributed to weakening of the interpolyhedral hydrogen-bond network.

机译：通过在液氮中淬灭MgCrO_4的水溶液，合成了一种新的铬酸镁水合物。 MgCrO_411H_2O是同质结构，稀有矿物堇青石（MgSO_4·11H_2O）是三斜晶系，P1，Z = 2，晶胞参数a = 6.811 33（8）A，b = 6.958 39（9）A，c = 17.3850（2 ）在-15°C下，α= 87.920（1）°，β= 89.480（1）°，γ= 62.772（1）°，V = 732.17（1）A3。带有SO_4-和CrO_4-的物种之间的晶胞参数差异仅部分由S-O和Cr-0键长的差异引起。其余的差异（电池体积的90％以上）归因于多面体间氢键网络的减弱。

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《Powder diffraction》 |2012年第1期|p.8-11|共4页
作者
A. Dominic Fortes; Ian G. Wood;
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作者单位

Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, United Kingdom,Centre for Planetary Sciences at UCL/Birkbeck, Gower Street, London WC1E 6BT, United Kingdom;

Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, United Kingdom,Centre for Planetary Sciences at UCL/Birkbeck, Gower Street, London WC1E 6BT, United Kingdom;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类
关键词
magnesium chromate; undecahydrate; meridianiite;

机译：铬酸镁十一水合物子午线石;

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X-ray powder diffraction analysis of a new magnesium chromate hydrate,MgCrO_411H_2O

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