Phase equilibria in the Bi2TeO5-Bi2SeO5 system and a high temperature neutron powder diffraction study of Bi2SeO5

OA Dityatyev; P Smidt; S Yu Stefanovich; Philip Lightfoot; VA Dolgikh; H Opperman

doi:10.1016/j.solidstatesciences.2004.05.004

Phase equilibria in the Bi₂TeO₅-Bi₂SeO₅ system and a high temperature neutron powder diffraction study of Bi₂SeO₅

OA Dityatyev, P Smidt, S Yu Stefanovich, Philip Lightfoot, VA Dolgikh, H Opperman

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Abstract

Phase equilibria in the Bi2TeO5-Bi2SeO5 system were studied by X-ray, DTA and second harmonic generation (SHG). The samples were synthesized by solid state reactions of the Bi, Te and Se oxides. The phase diagram is interpreted as a quasibinary peritectic one with wide ranges of solid solutions on the basis of both compounds. The SHG study showed Bi2SeO5 to undergo a phase transition at about 250 degreesC. Neutron diffraction (25-650 degreesC) showed no major changes in the structure of Bi2SeO5 at high temperatures. However, the analysis of the oxygen atom thermal factors and site occupancies suggested that the mechanism of the phase transformation is an order-disorder transition involving reorientation of the SeO3 group. (C) 2004 Elsevier SAS. All rights reserved.

Original language	English
Pages (from-to)	915-922
Number of pages	8
Journal	Solid State Sciences
Volume	6
DOIs	https://doi.org/10.1016/j.solidstatesciences.2004.05.004
Publication status	Published - Sept 2004

Keywords

selenite
tellurite
crystal structure
second harmonic generation
CRYSTAL-STRUCTURE

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10.1016/j.solidstatesciences.2004.05.004

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title = "Phase equilibria in the Bi2TeO5-Bi2SeO5 system and a high temperature neutron powder diffraction study of Bi2SeO5",

abstract = "Phase equilibria in the Bi2TeO5-Bi2SeO5 system were studied by X-ray, DTA and second harmonic generation (SHG). The samples were synthesized by solid state reactions of the Bi, Te and Se oxides. The phase diagram is interpreted as a quasibinary peritectic one with wide ranges of solid solutions on the basis of both compounds. The SHG study showed Bi2SeO5 to undergo a phase transition at about 250 degreesC. Neutron diffraction (25-650 degreesC) showed no major changes in the structure of Bi2SeO5 at high temperatures. However, the analysis of the oxygen atom thermal factors and site occupancies suggested that the mechanism of the phase transformation is an order-disorder transition involving reorientation of the SeO3 group. (C) 2004 Elsevier SAS. All rights reserved.",

keywords = "selenite, tellurite, crystal structure, second harmonic generation, CRYSTAL-STRUCTURE",

author = "OA Dityatyev and P Smidt and {Yu Stefanovich}, S and Philip Lightfoot and VA Dolgikh and H Opperman",

year = "2004",

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doi = "10.1016/j.solidstatesciences.2004.05.004",

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T1 - Phase equilibria in the Bi2TeO5-Bi2SeO5 system and a high temperature neutron powder diffraction study of Bi2SeO5

AU - Dityatyev, OA

AU - Smidt, P

AU - Yu Stefanovich, S

AU - Lightfoot, Philip

AU - Dolgikh, VA

AU - Opperman, H

PY - 2004/9

Y1 - 2004/9

N2 - Phase equilibria in the Bi2TeO5-Bi2SeO5 system were studied by X-ray, DTA and second harmonic generation (SHG). The samples were synthesized by solid state reactions of the Bi, Te and Se oxides. The phase diagram is interpreted as a quasibinary peritectic one with wide ranges of solid solutions on the basis of both compounds. The SHG study showed Bi2SeO5 to undergo a phase transition at about 250 degreesC. Neutron diffraction (25-650 degreesC) showed no major changes in the structure of Bi2SeO5 at high temperatures. However, the analysis of the oxygen atom thermal factors and site occupancies suggested that the mechanism of the phase transformation is an order-disorder transition involving reorientation of the SeO3 group. (C) 2004 Elsevier SAS. All rights reserved.

AB - Phase equilibria in the Bi2TeO5-Bi2SeO5 system were studied by X-ray, DTA and second harmonic generation (SHG). The samples were synthesized by solid state reactions of the Bi, Te and Se oxides. The phase diagram is interpreted as a quasibinary peritectic one with wide ranges of solid solutions on the basis of both compounds. The SHG study showed Bi2SeO5 to undergo a phase transition at about 250 degreesC. Neutron diffraction (25-650 degreesC) showed no major changes in the structure of Bi2SeO5 at high temperatures. However, the analysis of the oxygen atom thermal factors and site occupancies suggested that the mechanism of the phase transformation is an order-disorder transition involving reorientation of the SeO3 group. (C) 2004 Elsevier SAS. All rights reserved.

KW - selenite

KW - tellurite

KW - crystal structure

KW - second harmonic generation

KW - CRYSTAL-STRUCTURE

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U2 - 10.1016/j.solidstatesciences.2004.05.004

DO - 10.1016/j.solidstatesciences.2004.05.004

M3 - Article

SN - 1293-2558

VL - 6

SP - 915

EP - 922

JO - Solid State Sciences

JF - Solid State Sciences

ER -

Phase equilibria in the Bi₂TeO₅-Bi₂SeO₅ system and a high temperature neutron powder diffraction study of Bi₂SeO₅

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Keywords

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