Iranite, CuPb10(CrO4)6(SiO4)2(OH) 2, isomorphous with hemihedrite

Hexiong Yang, Jennifer L. Sano, Carla Eichler, Robert T Downs, Gelu Costin

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This study presents the first structural report of iranite, ideally CuPb10(CrO4)6(SiO4)2(OH)2 [copper deca-lead hexa-chromate bis-(orthosilicate) dihydroxide], based on single-crystal X-ray diffraction data. Iranite is isomorphous with hemihedrite, with substitution of Cu for Zn and OH for F. The Cu atom is situated at the special position with site symmetry . The CrO4 and SiO4 tetra-hedra and CuO4(OH)2 octa-hedra form layers that are parallel to (120) and are linked together by five symmetrically independent Pb2+ cations displaying a rather wide range of bond distances. The CuO4(OH)2 octa-hedra are corner-linked to two CrO4 and two SiO4 groups, while two additional CrO4 groups are isolated. The mean Cr - O distances for the three nonequivalent CrO4 tetra-hedra are all slightly shorter than the corresponding distances in hemihedrite, whereas the CuO4(OH)2 octa-hedron is more distorted than the ZnO4F2 octa-hedron in hemihedrite in terms of octa-hedral quadratic elongation.

Original languageEnglish (US)
JournalActa Crystallographica Section C: Crystal Structure Communications
Volume63
Issue number12
DOIs
StatePublished - Nov 24 2007

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Chromates
X-Ray Diffraction
Cations
Copper
Elongation
Substitution reactions
Single crystals
X ray diffraction
Atoms
chromates
elongation
substitutes
cations
copper
single crystals
symmetry
diffraction
atoms
Lead
lead chromate

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Structural Biology

Cite this

Iranite, CuPb10(CrO4)6(SiO4)2(OH) 2, isomorphous with hemihedrite. / Yang, Hexiong; Sano, Jennifer L.; Eichler, Carla; Downs, Robert T; Costin, Gelu.

In: Acta Crystallographica Section C: Crystal Structure Communications, Vol. 63, No. 12, 24.11.2007.

Research output: Contribution to journalArticle

Yang, Hexiong ; Sano, Jennifer L. ; Eichler, Carla ; Downs, Robert T ; Costin, Gelu. / Iranite, CuPb10(CrO4)6(SiO4)2(OH) 2, isomorphous with hemihedrite. In: Acta Crystallographica Section C: Crystal Structure Communications. 2007 ; Vol. 63, No. 12.
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