EXAFS STUDY OF THE LOCAL STRUCTURE OF Ga IN Ga2O3-P2O5 GLASSES
EXAFS STUDY OF THE LOCAL STRUCTURE OF Ga IN Ga2O3-P2O5 GLASSES出 版 物：《Journal of Wuhan University of Technology-Materials Science》 (武汉理工大学学报-材料科学版(英文版))
年 卷 期：1988年第1期
页 面：13-20页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：EXAFS STUDY OF THE LOCAL STRUCTURE OF Ga IN Ga2O3-P2O5 GLASSES Ga RO
摘 要：Room temperature EXAFS spectra of a series ofgallium phosphate glasses have been obtained in alaboratory EXAFS *** transform isemployed for EXAFS data ***-cristobalitetype GaPO4 crystal is used as a standard specimento extract the local structure parameters of Gaatoms in Ga2O3-P2O5 *** Ga-O average bondlength is 1.75-1.86 and Ga atoms can form both[GaO4] tetrahedra and [GaO6] octahedra in some ofthese *** coordination number of Ga atomschanges from six to four with the increase of Ga2O3content,and this change becomes more significantwhen the Ga2O3 content exceeds 30mol%.The anomalouschange of the refractive index at 30mol% Ga2O3 iscaused by the change of the local structure of Gafrom [GaO6] octahedra to [GaO4] tetrahedra.A simpleformula to estimate the concentration of six foldcoordinated Ga atoms in glasses is derived based onaverage bond length measured from the EXAFS.
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