Thermal expansion of francisite, [Cu3BiO2](SeO3)2Cl, and its interpretation based on oxocentered copper-bismuth tetrahedra

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Abstract

The thermal expansion of francisite, [Cu3-BiO2](SeO3)2Cl, a rare copper(II)-bismuth(III) oxide chloride selenite, was studied by high-temperature X-ray powder diffraction over the temperature range 293-773 K. The mineral is stable up to 748 K at which temperature it decomposes to [Bi2O2]Se, CuO and, probably, [BiO][CuSe]. The thermal expansion has an anisotropic character (α(a) = 9.0, α(b) = 4.7, α(c) = 17.0 · 10-6 K-1), which is determined by the distribution of the bonds between additional oxygen atoms ((a)O) and metal atoms (A). These bonds form two-dimensional systems in which each (a)O atom is tetrahedrally coordinated by one Bi and three Cu atoms. Thus the structure can be described in terms of oxocentered metal atom tetrahedra consisting of [(a)O2Cu3Bi] layers of ((a)OCu3Bi) tetrahedra, (SeO3) groups and Cl anions. This description gives the most reasonable viewpoint to explain the anisotropic thermal expansion character of francisite.

Original languageEnglish
Pages (from-to)440-444
Number of pages5
JournalPhysics and Chemistry of Minerals
Volume27
Issue number6
DOIs
Publication statusPublished - 1 Jan 2000

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Bismuth
bismuth
thermal expansion
Thermal expansion
Copper
copper
Atoms
selenite
metal
Metals
anion
Selenious Acid
temperature
X-ray diffraction
chloride
oxide
oxygen
X ray powder diffraction
Temperature
Anions

Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

Cite this

@article{e98141003d4949b89609937e7da146fc,
title = "Thermal expansion of francisite, [Cu3BiO2](SeO3)2Cl, and its interpretation based on oxocentered copper-bismuth tetrahedra",
abstract = "The thermal expansion of francisite, [Cu3-BiO2](SeO3)2Cl, a rare copper(II)-bismuth(III) oxide chloride selenite, was studied by high-temperature X-ray powder diffraction over the temperature range 293-773 K. The mineral is stable up to 748 K at which temperature it decomposes to [Bi2O2]Se, CuO and, probably, [BiO][CuSe]. The thermal expansion has an anisotropic character (α(a) = 9.0, α(b) = 4.7, α(c) = 17.0 · 10-6 K-1), which is determined by the distribution of the bonds between additional oxygen atoms ((a)O) and metal atoms (A). These bonds form two-dimensional systems in which each (a)O atom is tetrahedrally coordinated by one Bi and three Cu atoms. Thus the structure can be described in terms of oxocentered metal atom tetrahedra consisting of [(a)O2Cu3Bi] layers of ((a)OCu3Bi) tetrahedra, (SeO3) groups and Cl anions. This description gives the most reasonable viewpoint to explain the anisotropic thermal expansion character of francisite.",
keywords = "Francisite, Oxocentered tetrahedra, Thermal expansion",
author = "Nazarchuk, {E. V.} and Krivovichev, {S. V.} and Pankratova, {O. Yu} and Filatov, {S. K.}",
year = "2000",
month = "1",
day = "1",
doi = "10.1007/s002699900079",
language = "English",
volume = "27",
pages = "440--444",
journal = "Physics and Chemistry of Minerals",
issn = "0342-1791",
publisher = "Springer",
number = "6",

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TY - JOUR

T1 - Thermal expansion of francisite, [Cu3BiO2](SeO3)2Cl, and its interpretation based on oxocentered copper-bismuth tetrahedra

AU - Nazarchuk, E. V.

AU - Krivovichev, S. V.

AU - Pankratova, O. Yu

AU - Filatov, S. K.

PY - 2000/1/1

Y1 - 2000/1/1

N2 - The thermal expansion of francisite, [Cu3-BiO2](SeO3)2Cl, a rare copper(II)-bismuth(III) oxide chloride selenite, was studied by high-temperature X-ray powder diffraction over the temperature range 293-773 K. The mineral is stable up to 748 K at which temperature it decomposes to [Bi2O2]Se, CuO and, probably, [BiO][CuSe]. The thermal expansion has an anisotropic character (α(a) = 9.0, α(b) = 4.7, α(c) = 17.0 · 10-6 K-1), which is determined by the distribution of the bonds between additional oxygen atoms ((a)O) and metal atoms (A). These bonds form two-dimensional systems in which each (a)O atom is tetrahedrally coordinated by one Bi and three Cu atoms. Thus the structure can be described in terms of oxocentered metal atom tetrahedra consisting of [(a)O2Cu3Bi] layers of ((a)OCu3Bi) tetrahedra, (SeO3) groups and Cl anions. This description gives the most reasonable viewpoint to explain the anisotropic thermal expansion character of francisite.

AB - The thermal expansion of francisite, [Cu3-BiO2](SeO3)2Cl, a rare copper(II)-bismuth(III) oxide chloride selenite, was studied by high-temperature X-ray powder diffraction over the temperature range 293-773 K. The mineral is stable up to 748 K at which temperature it decomposes to [Bi2O2]Se, CuO and, probably, [BiO][CuSe]. The thermal expansion has an anisotropic character (α(a) = 9.0, α(b) = 4.7, α(c) = 17.0 · 10-6 K-1), which is determined by the distribution of the bonds between additional oxygen atoms ((a)O) and metal atoms (A). These bonds form two-dimensional systems in which each (a)O atom is tetrahedrally coordinated by one Bi and three Cu atoms. Thus the structure can be described in terms of oxocentered metal atom tetrahedra consisting of [(a)O2Cu3Bi] layers of ((a)OCu3Bi) tetrahedra, (SeO3) groups and Cl anions. This description gives the most reasonable viewpoint to explain the anisotropic thermal expansion character of francisite.

KW - Francisite

KW - Oxocentered tetrahedra

KW - Thermal expansion

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