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BIBTEX RIS

The crystal chemistry of diaboleite*

1971; De Gruyter; Volume: 134; Issue: 1-2 Linguagem: Inglês

10.1524/zkri.1971.134.1-2.69

ISSN

2196-7105

Autores

Roland C. Rouse,

Tópico(s)

Crystal Structures and Properties

Resumo

Abstract Diaboleite, Pb 2 Cu(OH) 4 Cl 2 , is tetragonal, P 4 mm , with a = 5.870 Å and c = 5.494 Å. The structure has been refined by the method of least squares to a conventional R value of 5.0%. Diaboleite is a derivative of the cubic perovskite structure, ABO 3 , with Cu and possibly Cl vacancies. The perovskite-like subcell has dimensions A = a /√2 = 4.151 Å and C = c = 5.494 Å and the formula PbCu 1/2 (OH) 2 Cl or AB 1/2 O 3 . Cu(II) is coordinated by a square pyramid of 4 OH + 1 Cl and Pb(II) by a distorted square antiprism of 4 OH + 4 Cl. Structural distortions are interpreted in terms of Pb–Cu repulsions and the second-order Jahn-Teller effect.

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