Crystal chemistry and structure of the orthorhombic (Fe,Mn)(Ta,Nb)2O6 family of compounds

被引：22

作者：

dos Santos, CA ^{[1
]}

Zawislak, LI ^{[1
]}

Kinast, EJ ^{[1
]}

Antonietti, V ^{[1
]}

da Cunha, JBM ^{[1
]}

机构：

[1] Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil

来源：

BRAZILIAN JOURNAL OF PHYSICS | 2001年 / 31卷 / 04期

关键词：

D O I：

10.1590/S0103-97332001000400012

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this paper we review the crystal chemistry and structure data front the literature and our results reported in the last decade for natural and synthetic samples of the tantalite-columbite series. Order-disorder transitions and oxidation reactions on the ixiolite-columbite-wodginite system are reported for one Brazilian sample. It is shown that reports on these subjects art, sometimes dubious and incomplete. In addition to the reaction atmosphere (air or vacuum), order-disorder and oxidation are strongly dependent on the physical state of the samples (powdered or crystal). Structure and chemical composition have been investigated in our laboratory using X-ray diffraction (XRD), electron probe microanalysis (EPMA) and Mossbauer spectroscopy (MS).

引用

页码：616 / 631

页数：16

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