ESR STUDY OF C-13-ENRICHED CARBONATED CALCIUMAPATITES PRECIPITATED FROM AQUEOUS-SOLUTIONS

被引：11
作者：
CALLENS, FJ
VERBEECK, RMH
NAESSENS, DE
MATTHYS, PFA
BOESMAN, ER
机构：
[1] STATE UNIV GHENT,CRYSTALLOG & STUDY SOLID STATE LAB,KRIJGSLAAN 281-S12,B-9000 GHENT,BELGIUM
[2] STATE UNIV GHENT,ANALYT CHEM LAB,B-9000 GHENT,BELGIUM
来源：
CALCIFIED TISSUE INTERNATIONAL | 1993年 / 52卷 / 05期
关键词：
CARBONATE APATITE; ESR SPECTRUM;
D O I：
10.1007/BF00310204
中图分类号：
R5 [内科学];
学科分类号：
1002 ; 100201 ;
摘要：
The ESR spectrum of X-irradiated carbonated apatites precipitated from aqueous solutions was studied at carbonate contents ranging from approximately 5.4 up to 12.4 wt%. C-12- as well as C-13-enriched samples were prepared and examined with ESR after drying until constant weight at 25-degrees-C and 400-degrees-C. In these carbonated apatites, two CO33- radicals were detected, one of which is derived from B-type carbonate situated at a phosphate lattice site. The other CO33- most probably arises from CO32- ions situated at OH- lattice sites. In contradistinction to the B-type contribution, the A-type contribution to the overall ESR signal decreases in absolute terms with increasing carbonate concentration. In addition, the line shape and the complete set of principal g-values of the Al-signal found in previous studies could be determined. corroborating the assignment of Al to a surface O- ion.
引用
收藏
页码：386 / 391
页数：6
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