Crystal structure refinement of Ba5Nb4O15-x and Ba5Nb4O15-x by rietveld analysis of neutron and X-ray diffraction data

被引：25
|
作者：
Pagola, S
Polla, G
Leyva, G
Casais, MT
Alonso, JA
Rasines, I
Carbonio, RE
机构：
[1] COMIS NACL ENERGIA ATOM,DIV FIS SOLIDO,RA-1429 BUENOS AIRES,DF,ARGENTINA
[2] INST CIENCIA MAT,E-28006 MADRID,SPAIN
来源：
EUROPEAN POWDER DIFFRACTION: EPDIC IV, PTS 1 AND 2 | 1996年 / 228卷
关键词：
Ba5Nb4O15; Rietveld analysis; X-ray diffraction; neutron diffraction;
D O I：
10.4028/www.scientific.net/MSF.228-231.819
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Both X-ray and neutron diffraction data were analyzed by the Rietveld method, taking as starting structural model that of the Ba5Ta4O15 structure, The results of such an analysis show that the progressive elimination of oxygen ions produce only small changes in the structure. A decrease in the unit-cell parameters as the number of oxygen vacancies increases has been observed, which can be correlated with a gradual loss of oxygen ions in the close-packed layers. No ordering of the oxygen vacancies was found even in the sample with the highest x value, x = 0.56.
引用
收藏
页码：819 / 824
页数：6
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