An oxygen nonstoichiometry study of barium polytitanates with hollandite structure

D. S. Filimonov, Zi-kui Liu, Clive A. Randall

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A series of barium titanium oxides with various Ba/Ti ratios having a hollandite structure were obtained by firing chemical synthesized oxide precursors under reducing atmosphere conditions (H2/N2 gas mixture flow) at temperatures of 1100°C and above. An oxygen nonstoichiometry was determined by a thermogravimetric analysis through oxidizing in air. It was shown that barium titanium hollandites may adopt both oxygen excess and oxygen-deficient stoichiometries within the structure. As a limiting case the barium titanium hollandites with only tetravalent titanium ions were obtained. The influence of oxygen nonstoichiometry on the hollandite monoclinic-tetragonal phase transition and a barium superstructure ordering was investigated and discussed. Distortion scaling rules are considered to compare this work with earlier investigations on hollandites.

Original languageEnglish (US)
Pages (from-to)2373-2382
Number of pages10
JournalMaterials Research Bulletin
Volume37
Issue number14
DOIs
StatePublished - Nov 20 2002

Fingerprint

Barium
barium
Titanium
Oxygen
titanium
oxygen
barium oxides
Titanium oxides
titanium oxides
Gas mixtures
Stoichiometry
Oxides
gas mixtures
Thermogravimetric analysis
stoichiometry
Phase transitions
Ions
scaling
atmospheres
oxides

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "A series of barium titanium oxides with various Ba/Ti ratios having a hollandite structure were obtained by firing chemical synthesized oxide precursors under reducing atmosphere conditions (H2/N2 gas mixture flow) at temperatures of 1100°C and above. An oxygen nonstoichiometry was determined by a thermogravimetric analysis through oxidizing in air. It was shown that barium titanium hollandites may adopt both oxygen excess and oxygen-deficient stoichiometries within the structure. As a limiting case the barium titanium hollandites with only tetravalent titanium ions were obtained. The influence of oxygen nonstoichiometry on the hollandite monoclinic-tetragonal phase transition and a barium superstructure ordering was investigated and discussed. Distortion scaling rules are considered to compare this work with earlier investigations on hollandites.",
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An oxygen nonstoichiometry study of barium polytitanates with hollandite structure. / Filimonov, D. S.; Liu, Zi-kui; Randall, Clive A.

In: Materials Research Bulletin, Vol. 37, No. 14, 20.11.2002, p. 2373-2382.

Research output: Contribution to journalArticle

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AB - A series of barium titanium oxides with various Ba/Ti ratios having a hollandite structure were obtained by firing chemical synthesized oxide precursors under reducing atmosphere conditions (H2/N2 gas mixture flow) at temperatures of 1100°C and above. An oxygen nonstoichiometry was determined by a thermogravimetric analysis through oxidizing in air. It was shown that barium titanium hollandites may adopt both oxygen excess and oxygen-deficient stoichiometries within the structure. As a limiting case the barium titanium hollandites with only tetravalent titanium ions were obtained. The influence of oxygen nonstoichiometry on the hollandite monoclinic-tetragonal phase transition and a barium superstructure ordering was investigated and discussed. Distortion scaling rules are considered to compare this work with earlier investigations on hollandites.

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