Structure of the Mercury(II) Chromate(III) HgCr2O4 and Lattice Constants of the Isotypic Mercury(I) Compounds Hg2MoO4 and Hg2WO4
1998; Elsevier BV; Volume: 33; Issue: 1 Linguagem: Inglês
10.1016/s0025-5408(97)00194-3
ISSN1873-4227
AutoresAnnemarie L. Wessels, Ralf Czekalla, Wolfgang Jeitschko,
Tópico(s)Nuclear materials and radiation effects
ResumoThe previously reported cubic compound HgCr2O4 was prepared by thermal decomposition of Hg2CrO4 at 400 °C in evacuated, sealed silica tubes. Its structure was determined by a Rietveld analysis of powder diffractometer data. It is of spinel type (a = 865.8(1) pm), and it was refined to a profile residual of Rp = 0.092. The Guinier powder patterns of the isotypic yellow compounds Hg2MoO4 and Hg2WO4 were indexed with the parameters of a monoclinic C-centered lattice (Hg2MoO4: a = 873.7(1) pm, b = 1155.1(1) pm, c = 493.17(4) pm, and β = 115.24(1)°; Hg2WO4: a = 73.4(2) pm, b = 1148.3(2) pm, c = 493.16(7) pm, and β = 114.87(1)°).
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