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Title: Type A-B carbonate chlorapatite synthesized at high pressure

Abstract

Sodium-bearing type A-B carbonate chlorapatites {l_brace}CCLAP; Ca{sub 10-(y+z)}Na{sub y}{open_square}{sub z}[(PO{sub 4}){sub 6-(y+2z)}(CO{sub 3}){sub y+2z}][Cl{sub 2-=} 2{sub x}(CO{sub 3}){sub x}], with x{approx}y{approx}4z{approx}0.4{r_brace} have been synthesized from carbonate-rich melts at 1350-1000 deg. C and 1.0 GPa, and investigated by single-crystal X-ray structure and FTIR spectroscopy. Typical crystal and compositional data are: a=9.5321(4) A, c=6.8448(3) A, space group P6{sub 3}/m, R=0.027, R{sub w}=0.025, x=0.37(3), y=0.57(2). Crystal-chemical features and FTIR spectra are similar to Na-bearing type A-B carbonate hydroxyapatites (CHAP) and fluorapatites (CFAP) reported recently. The molar amounts of Na and channel (type A) carbonate maintain a near 1:1 ratio in all three composition series, confirming that the Na cation and A and B carbonate ion substituents exist as a defect cluster within the apatite matrix, to facilitate charge compensation and spatial accommodation. Uptake of carbonate is significantly lower in CCLAP than in CHAP for similar conditions of crystal synthesis. - Graphical abstract: Defect cluster (blue) of A carbonate ion in apatite channel, Na{sup +} cation, and B carbonate ion replacing phosphate group, in carbonate chlorapatite synthesized at high pressure.

Authors:
 [1];  [2]
  1. Department of Earth Sciences, University of Western Ontario, London, Ontario, N6A 5B7 (Canada), E-mail: mfleet@uwo.ca
  2. Department of Earth Sciences, University of Western Ontario, London, Ontario, N6A 5B7 (Canada)
Publication Date:
OSTI Identifier:
21128475
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 181; Journal Issue: 9; Other Information: DOI: 10.1016/j.jssc.2008.06.016; PII: S0022-4596(08)00321-6; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; APATITES; CALCIUM COMPOUNDS; CARBONATES; CATIONS; HEXAGONAL LATTICES; INFRARED SPECTRA; MONOCRYSTALS; PHOSPHATES; PRESSURE RANGE GIGA PA; SODIUM COMPOUNDS; SODIUM IONS; SPECTROSCOPY; SYNTHESIS; TEMPERATURE RANGE 1000-4000 K

Citation Formats

Fleet, Michael E., and Liu, Xi. Type A-B carbonate chlorapatite synthesized at high pressure. United States: N. p., 2008. Web. doi:10.1016/j.jssc.2008.06.016.
Fleet, Michael E., & Liu, Xi. Type A-B carbonate chlorapatite synthesized at high pressure. United States. doi:10.1016/j.jssc.2008.06.016.
Fleet, Michael E., and Liu, Xi. Mon . "Type A-B carbonate chlorapatite synthesized at high pressure". United States. doi:10.1016/j.jssc.2008.06.016.
@article{osti_21128475,
title = {Type A-B carbonate chlorapatite synthesized at high pressure},
author = {Fleet, Michael E. and Liu, Xi},
abstractNote = {Sodium-bearing type A-B carbonate chlorapatites {l_brace}CCLAP; Ca{sub 10-(y+z)}Na{sub y}{open_square}{sub z}[(PO{sub 4}){sub 6-(y+2z)}(CO{sub 3}){sub y+2z}][Cl{sub 2-=} 2{sub x}(CO{sub 3}){sub x}], with x{approx}y{approx}4z{approx}0.4{r_brace} have been synthesized from carbonate-rich melts at 1350-1000 deg. C and 1.0 GPa, and investigated by single-crystal X-ray structure and FTIR spectroscopy. Typical crystal and compositional data are: a=9.5321(4) A, c=6.8448(3) A, space group P6{sub 3}/m, R=0.027, R{sub w}=0.025, x=0.37(3), y=0.57(2). Crystal-chemical features and FTIR spectra are similar to Na-bearing type A-B carbonate hydroxyapatites (CHAP) and fluorapatites (CFAP) reported recently. The molar amounts of Na and channel (type A) carbonate maintain a near 1:1 ratio in all three composition series, confirming that the Na cation and A and B carbonate ion substituents exist as a defect cluster within the apatite matrix, to facilitate charge compensation and spatial accommodation. Uptake of carbonate is significantly lower in CCLAP than in CHAP for similar conditions of crystal synthesis. - Graphical abstract: Defect cluster (blue) of A carbonate ion in apatite channel, Na{sup +} cation, and B carbonate ion replacing phosphate group, in carbonate chlorapatite synthesized at high pressure.},
doi = {10.1016/j.jssc.2008.06.016},
journal = {Journal of Solid State Chemistry},
number = 9,
volume = 181,
place = {United States},
year = {Mon Sep 15 00:00:00 EDT 2008},
month = {Mon Sep 15 00:00:00 EDT 2008}
}