An oxygen nonstoichiometry study of barium polytitanates with hollandite structure

D. S. Filimonov; Z. K. Liu; C. A. Randall

doi:10.1016/S0025-5408(02)00853-X

An oxygen nonstoichiometry study of barium polytitanates with hollandite structure

D. S. Filimonov, Z. K. Liu, C. A. Randall

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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.

Original language	English (US)
Pages (from-to)	2373-2382
Number of pages	10
Journal	Materials Research Bulletin
Volume	37
Issue number	14
DOIs	https://doi.org/10.1016/S0025-5408(02)00853-X
State	Published - Nov 20 2002

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/S0025-5408(02)00853-X

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title = "An oxygen nonstoichiometry study of barium polytitanates with hollandite structure",

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.",

author = "Filimonov, {D. S.} and Liu, {Z. K.} and Randall, {C. A.}",

note = "Funding Information: The authors are grateful to industrial members of the Center for Dielectric Studies and NSF I/UCRC for financial support of these studies. Z.-K. Liu is supported by the NSF Career Award under grant DMR-9983532.",

year = "2002",

month = nov,

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doi = "10.1016/S0025-5408(02)00853-X",

language = "English (US)",

volume = "37",

pages = "2373--2382",

journal = "Materials Research Bulletin",

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T1 - An oxygen nonstoichiometry study of barium polytitanates with hollandite structure

AU - Filimonov, D. S.

AU - Liu, Z. K.

AU - Randall, C. A.

N1 - Funding Information: The authors are grateful to industrial members of the Center for Dielectric Studies and NSF I/UCRC for financial support of these studies. Z.-K. Liu is supported by the NSF Career Award under grant DMR-9983532.

PY - 2002/11/20

Y1 - 2002/11/20

N2 - 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.

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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U2 - 10.1016/S0025-5408(02)00853-X

DO - 10.1016/S0025-5408(02)00853-X

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SN - 0025-5408

VL - 37

SP - 2373

EP - 2382

JO - Materials Research Bulletin

JF - Materials Research Bulletin

IS - 14

ER -

An oxygen nonstoichiometry study of barium polytitanates with hollandite structure

Abstract

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