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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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publishing date
type
Contribution to journal
publication status
published
subject
in
Solid State Sciences
volume
7
issue
1
pages
97 - 102
publisher
Elsevier
external identifiers
  • wos:000226561200014
  • scopus:11844280906
ISSN
1873-3085
DOI
10.1016/j.solidstatesciences.2004.10.014
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Polymer and Materials Chemistry (LTH) (011001041)
id
beae9492-d61a-42a3-9feb-f0a4e3989e27 (old id 152224)
date added to LUP
2016-04-01 11:38:10
date last changed
2022-04-20 19:35:52
@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    = {{Elsevier}},
  series       = {{Solid State Sciences}},
  title        = {{Nonstoichiometry in chlorellestadite}},
  url          = {{http://dx.doi.org/10.1016/j.solidstatesciences.2004.10.014}},
  doi          = {{10.1016/j.solidstatesciences.2004.10.014}},
  volume       = {{7}},
  year         = {{2005}},
}