CRYSTAL-GROWTH, CRYSTAL-STRUCTURE AND CHEMICAL-COMPOSITION OF A PYROCHLORE TYPE COMPOUND IN LEAD-MAGNESIUM-NIOBIUM-OXYGEN SYSTEM

被引：39

作者：

WAKIYA, N

SAIKI, A

ISHIZAWA, N

SHINOZAKI, K

MIZUTANI, N

机构：

[1] TOKYO INST TECHNOL,FAC ENGN,DEPT INORGAN MAT,2-12-1 O OKAYAMA,MEGURO KU,TOKYO 152,JAPAN

[2] TOKYO INST TECHNOL,ENGN MAT RES LAB,MIDORI KU,YOKOHAMA,KANAGAWA 227,JAPAN

来源：

MATERIALS RESEARCH BULLETIN | 1993年 / 28卷 / 02期

关键词：

PYROCHLORE; LEAD; MAGNESIUM; NIOBIUM;

D O I：

10.1016/0025-5408(93)90082-O

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The single crystal of pyrochlore type compound in Pb-Mg-Nb-0 system (Pb1.86Mg0.24Nb1.76O6.5) was grown by using a PbO flux. The space group is Fd3m with a=1.06029(2)nm, V=1.19200(1)nm3, Z=8, Dx=7.34gcm-3 and mu(MoK(alpha))=547.28cm-1. Both oxygen vacancies and cations arc not ordered. Refined final R and Rw are 3.08% and 2.83% respectively for 213 independent reflection data collected on a four-circle X-ray diffractometer. The crystal is characterized by the pyrochlore structure having deficient Pb at the A(8d) site and deficient 0 al the 0(2)(8B) site. Mg and Nb statistically occupy the B(8c) site. The oxygen content 6.5 seems common in this type of compounds.

引用

页码：137 / 143

页数：7

共 23 条

[11] NEW OXIDE PYROCHLORES - A2[B2-XAX]O7-Y (A = PB, BI-B = RU, IR) [J].