Oxidation of bismuth tellurite, Bi2TeO5 I. Thermoanalytical and optical microscopic studies

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Abstract

Deatailed thermoanalytical experiments were carried out to reveal the oxidative and reductive processes in the Bi2TeO5/Bi2TeO6 system. The oxidation of Bi2TeO5 starts at about 450°C but completed oxidation can only be achieved in oxygen ambient with a 670°C isothermal treatment. The decomposition of Bi2TeO6 stars at 663°C. Above 790°C the loss of TeO2 is evident. The oxidation rate of Bi2TeO5 single crystals is extremly low and develops a very complicated reaction interface changing in the course of reaction.

Original languageEnglish
Pages (from-to)365-372
Number of pages8
JournalJournal of Solid State Chemistry
Volume161
Issue number2
DOIs
Publication statusPublished - Nov 1 2001

Fingerprint

Bismuth
bismuth
Oxidation
oxidation
Stars
Single crystals
Oxygen
Decomposition
decomposition
stars
single crystals
oxygen
tellurous acid
Experiments

Keywords

  • BiTeO
  • Bismuth tellurite
  • DSC
  • Optical materials
  • Oxidation
  • TG
  • TG-MS

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

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abstract = "Deatailed thermoanalytical experiments were carried out to reveal the oxidative and reductive processes in the Bi2TeO5/Bi2TeO6 system. The oxidation of Bi2TeO5 starts at about 450°C but completed oxidation can only be achieved in oxygen ambient with a 670°C isothermal treatment. The decomposition of Bi2TeO6 stars at 663°C. Above 790°C the loss of TeO2 is evident. The oxidation rate of Bi2TeO5 single crystals is extremly low and develops a very complicated reaction interface changing in the course of reaction.",
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T1 - Oxidation of bismuth tellurite, Bi2TeO5 I. Thermoanalytical and optical microscopic studies

AU - Pöppl, L.

AU - Földvári, I.

AU - Várhegyi, G.

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AB - Deatailed thermoanalytical experiments were carried out to reveal the oxidative and reductive processes in the Bi2TeO5/Bi2TeO6 system. The oxidation of Bi2TeO5 starts at about 450°C but completed oxidation can only be achieved in oxygen ambient with a 670°C isothermal treatment. The decomposition of Bi2TeO6 stars at 663°C. Above 790°C the loss of TeO2 is evident. The oxidation rate of Bi2TeO5 single crystals is extremly low and develops a very complicated reaction interface changing in the course of reaction.

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KW - DSC

KW - Optical materials

KW - Oxidation

KW - TG

KW - TG-MS

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