Synthesis of non-stoichiometric Bi2O4-x by oxidative precipitation

Prakash, A. S. ; Shivakumara, C. ; Hegde, M. S. ; Dupont, L. ; Tarascon, J. -M. (2007) Synthesis of non-stoichiometric Bi2O4-x by oxidative precipitation Materials Research Bulletin, 42 (4). pp. 707-712. ISSN 0025-5408

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Bi2O4-x, a Bi mixed-valence phase was prepared at 95 °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 °C in a multiple step process by some O2 losses prior to finally transforming into γ-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 ~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) Å, is Bi2O3.65± 0.10.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:A. Inorganic Compounds; B. Chemical Synthesis; C. X-ray Diffraction; D. Optical Properties
ID Code:16161
Deposited On:15 Nov 2010 14:06
Last Modified:03 Jun 2011 07:21

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