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Nonstoichiometry in chlorellestadite

Jegou Saint-Jean, Simon LU and Hansen, Staffan LU (2005) In Solid State Sciences 7(1). p.97-102
Abstract
The structural development of apatite-type chlorellestadite was studied as a function of annealing time by Rietveld refinements based on X-ray powder diffraction data (Cu-K-alpha1). Annealing (900-1100 degreesC) in air of chlorellestadite with the unit cell content: Ca-9(SiO4)(3)(SO4)(3)-(1-x)CaC1(2) (x approximate to 0) produced a nonstoichiometric phase (0 less than or equal to x less than or equal to 0.6), which then upon further heating decomposed into ternesite Ca-5 (SiO4)(2)(SO4), anhydrite CaSO4 and lime CaO. Increasing the temperature caused a more rapid loss of CaCl2 and a more rapid onset of decomposition into the former phases. Crystal data of the chlorellestadite series: hexagonal symmetry, space group P6(3)/m (0 less than or... (More)
The structural development of apatite-type chlorellestadite was studied as a function of annealing time by Rietveld refinements based on X-ray powder diffraction data (Cu-K-alpha1). Annealing (900-1100 degreesC) in air of chlorellestadite with the unit cell content: Ca-9(SiO4)(3)(SO4)(3)-(1-x)CaC1(2) (x approximate to 0) produced a nonstoichiometric phase (0 less than or equal to x less than or equal to 0.6), which then upon further heating decomposed into ternesite Ca-5 (SiO4)(2)(SO4), anhydrite CaSO4 and lime CaO. Increasing the temperature caused a more rapid loss of CaCl2 and a more rapid onset of decomposition into the former phases. Crystal data of the chlorellestadite series: hexagonal symmetry, space group P6(3)/m (0 less than or equal to x less than or equal to 0.6); and a = 9.677 Angstrom, c = 6.858 Angstrom for x approximate to 0; as compared to a = 9.561 Angstrom, c = 6.895 Angstrom for x approximate to 0.6. The results indicated that the chlorellestadite structure can accommodate an unusually high level of Schottky defects. (C) 2004 Elsevier SAS. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Solid State Sciences
volume
7
issue
1
pages
97 - 102
publisher
Editions scientifiques Elsevier
external identifiers
  • wos:000226561200014
  • scopus:11844280906
ISSN
1873-3085
DOI
10.1016/j.solidstatesciences.2004.10.014
language
English
LU publication?
yes
id
beae9492-d61a-42a3-9feb-f0a4e3989e27 (old id 152224)
date added to LUP
2007-07-13 15:47:22
date last changed
2017-01-01 04:23:36
@article{beae9492-d61a-42a3-9feb-f0a4e3989e27,
  abstract     = {The structural development of apatite-type chlorellestadite was studied as a function of annealing time by Rietveld refinements based on X-ray powder diffraction data (Cu-K-alpha1). Annealing (900-1100 degreesC) in air of chlorellestadite with the unit cell content: Ca-9(SiO4)(3)(SO4)(3)-(1-x)CaC1(2) (x approximate to 0) produced a nonstoichiometric phase (0 less than or equal to x less than or equal to 0.6), which then upon further heating decomposed into ternesite Ca-5 (SiO4)(2)(SO4), anhydrite CaSO4 and lime CaO. Increasing the temperature caused a more rapid loss of CaCl2 and a more rapid onset of decomposition into the former phases. Crystal data of the chlorellestadite series: hexagonal symmetry, space group P6(3)/m (0 less than or equal to x less than or equal to 0.6); and a = 9.677 Angstrom, c = 6.858 Angstrom for x approximate to 0; as compared to a = 9.561 Angstrom, c = 6.895 Angstrom for x approximate to 0.6. The results indicated that the chlorellestadite structure can accommodate an unusually high level of Schottky defects. (C) 2004 Elsevier SAS. All rights reserved.},
  author       = {Jegou Saint-Jean, Simon and Hansen, Staffan},
  issn         = {1873-3085},
  language     = {eng},
  number       = {1},
  pages        = {97--102},
  publisher    = {Editions scientifiques Elsevier},
  series       = {Solid State Sciences},
  title        = {Nonstoichiometry in chlorellestadite},
  url          = {http://dx.doi.org/10.1016/j.solidstatesciences.2004.10.014},
  volume       = {7},
  year         = {2005},
}