Synthesis of non-stoichiometric Bi2O4-x by oxidative precipitation

被引：32

作者：

Prakash, A. S.

Shivakumara, C.

Hegde, M. S. ^{[1
]}

Dupont, L.

Tarascon, J. -M.

机构：

[1] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India

[2] Univ Picardie, Lab React & Chim Solides, Amiens, France

来源：

MATERIALS RESEARCH BULLETIN | 2007年 / 42卷 / 04期

关键词：

inorganic compounds; chemical synthesis; X-ray diffraction; optical properties;

D O I：

10.1016/j.materresbull.2006.07.019

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Bi2O4-x, a Bi mixed-valence phase was prepared at 95 degrees C, by a precipitation process, in a basic medium with a highly oxidizing K2S2O8/Na2S2O8. This phase has a low thermal stability as it decomposes below 400 degrees C in a multiple step process by some O-2 losses prior to finally transforming into gamma-Bi2O3. The as-prepared powders are 50-60 nm in size with a narrow size distribution. Optical spectra of Bi2O4-x exhibit a broad absorption band with a band gap of similar to 1.4 eV as compared to 2.61 eV for Bi2O3. The composition of this non-stoichiometric phase, which crystallizes in cubic fluorite related structure with a cell parameter of 5 538(3) angstrom, is Bi2O3.65 +/- 0.10. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：707 / 712

页数：6

共 17 条

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