Synthesis of novel cation-ordered compounds with fluorite-related structure prepared by oxidation of Sn-Ta-O pyrochlore

Masao Kita; Takahisa Omata; Shinya Otsuka-Yao-Matsuo; Motomi Katada

doi:10.1016/j.jssc.2005.01.029

Synthesis of novel cation-ordered compounds with fluorite-related structure prepared by oxidation of Sn-Ta-O pyrochlore

Masao Kita, Takahisa Omata, Shinya Otsuka-Yao-Matsuo, Motomi Katada

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Pyrochlore-type oxide, Sn^II_1.64(Ta _1.88Sn^IV_0.12)O_6.58 was oxidized for exploring novel metastable phases. Two novel Sn^IV _0.82(Ta_0.94Sn^IV_0.06)O _4.11 phases with a fluorite-related structure, which was obtained as a pure phase, and with a rutile-related structure appearing as an impurity for the fluorite-related phase were successfully obtained similar to the previous Sn-Nb-O system. The ordered arrangement of respective cations of Sn and (0.94Ta+0.06Sn) in the precursor Sn^II_1.64(Ta _1.88Sn^IV_0.12)O_6.58 was left in the both oxidized Sn^IV_0.82(Ta_0.94Sn ^IV_0.06)O_4.11 phases. In contrast to the previous Sn-Nb-O system, the cation-ordered α-PbO₂-related Sn^IV_0.82(Ta_0.94Sn^IV _0.06)O_4.11 could not be obtained in the present conditions. Such a difference between the Sn-Ta-O and Sn-Nb-O systems was interpreted by larger energy barrier of the transformation from the fluorite-related phase to α-PbO₂-related phase in Sn-Ta-O system than in Sn-Nb-O system.

Original language	English
Pages (from-to)	1254-1261
Number of pages	8
Journal	Journal of Solid State Chemistry
Volume	178
Issue number	4
DOIs	https://doi.org/10.1016/j.jssc.2005.01.029
Publication status	Published - 2005 Apr
Externally published	Yes

Keywords

Cation-ordered structure
Fluorite structure
Metastable phase
Oxygen intercalation
Phase transformation
Pyrochlore structure
Tantalum oxide
Tin oxide

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/j.jssc.2005.01.029

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@article{30898a7c47824a8eafb5f404db83633c,

title = "Synthesis of novel cation-ordered compounds with fluorite-related structure prepared by oxidation of Sn-Ta-O pyrochlore",

abstract = "Pyrochlore-type oxide, SnII1.64(Ta 1.88SnIV0.12)O6.58 was oxidized for exploring novel metastable phases. Two novel SnIV 0.82(Ta0.94SnIV0.06)O 4.11 phases with a fluorite-related structure, which was obtained as a pure phase, and with a rutile-related structure appearing as an impurity for the fluorite-related phase were successfully obtained similar to the previous Sn-Nb-O system. The ordered arrangement of respective cations of Sn and (0.94Ta+0.06Sn) in the precursor SnII1.64(Ta 1.88SnIV0.12)O6.58 was left in the both oxidized SnIV0.82(Ta0.94Sn IV0.06)O4.11 phases. In contrast to the previous Sn-Nb-O system, the cation-ordered α-PbO2-related SnIV0.82(Ta0.94SnIV 0.06)O4.11 could not be obtained in the present conditions. Such a difference between the Sn-Ta-O and Sn-Nb-O systems was interpreted by larger energy barrier of the transformation from the fluorite-related phase to α-PbO2-related phase in Sn-Ta-O system than in Sn-Nb-O system.",

keywords = "Cation-ordered structure, Fluorite structure, Metastable phase, Oxygen intercalation, Phase transformation, Pyrochlore structure, Tantalum oxide, Tin oxide",

author = "Masao Kita and Takahisa Omata and Shinya Otsuka-Yao-Matsuo and Motomi Katada",

note = "Funding Information: This work was supported in part by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (Grant No. 15360346) and a Grant-in-Aid from Research Foundation for Materials Science (Tokyo).",

year = "2005",

month = apr,

doi = "10.1016/j.jssc.2005.01.029",

language = "English",

volume = "178",

pages = "1254--1261",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

number = "4",

}

TY - JOUR

T1 - Synthesis of novel cation-ordered compounds with fluorite-related structure prepared by oxidation of Sn-Ta-O pyrochlore

AU - Kita, Masao

AU - Omata, Takahisa

AU - Otsuka-Yao-Matsuo, Shinya

AU - Katada, Motomi

N1 - Funding Information: This work was supported in part by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (Grant No. 15360346) and a Grant-in-Aid from Research Foundation for Materials Science (Tokyo).

PY - 2005/4

Y1 - 2005/4

N2 - Pyrochlore-type oxide, SnII1.64(Ta 1.88SnIV0.12)O6.58 was oxidized for exploring novel metastable phases. Two novel SnIV 0.82(Ta0.94SnIV0.06)O 4.11 phases with a fluorite-related structure, which was obtained as a pure phase, and with a rutile-related structure appearing as an impurity for the fluorite-related phase were successfully obtained similar to the previous Sn-Nb-O system. The ordered arrangement of respective cations of Sn and (0.94Ta+0.06Sn) in the precursor SnII1.64(Ta 1.88SnIV0.12)O6.58 was left in the both oxidized SnIV0.82(Ta0.94Sn IV0.06)O4.11 phases. In contrast to the previous Sn-Nb-O system, the cation-ordered α-PbO2-related SnIV0.82(Ta0.94SnIV 0.06)O4.11 could not be obtained in the present conditions. Such a difference between the Sn-Ta-O and Sn-Nb-O systems was interpreted by larger energy barrier of the transformation from the fluorite-related phase to α-PbO2-related phase in Sn-Ta-O system than in Sn-Nb-O system.

AB - Pyrochlore-type oxide, SnII1.64(Ta 1.88SnIV0.12)O6.58 was oxidized for exploring novel metastable phases. Two novel SnIV 0.82(Ta0.94SnIV0.06)O 4.11 phases with a fluorite-related structure, which was obtained as a pure phase, and with a rutile-related structure appearing as an impurity for the fluorite-related phase were successfully obtained similar to the previous Sn-Nb-O system. The ordered arrangement of respective cations of Sn and (0.94Ta+0.06Sn) in the precursor SnII1.64(Ta 1.88SnIV0.12)O6.58 was left in the both oxidized SnIV0.82(Ta0.94Sn IV0.06)O4.11 phases. In contrast to the previous Sn-Nb-O system, the cation-ordered α-PbO2-related SnIV0.82(Ta0.94SnIV 0.06)O4.11 could not be obtained in the present conditions. Such a difference between the Sn-Ta-O and Sn-Nb-O systems was interpreted by larger energy barrier of the transformation from the fluorite-related phase to α-PbO2-related phase in Sn-Ta-O system than in Sn-Nb-O system.

KW - Cation-ordered structure

KW - Fluorite structure

KW - Metastable phase

KW - Oxygen intercalation

KW - Phase transformation

KW - Pyrochlore structure

KW - Tantalum oxide

KW - Tin oxide

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U2 - 10.1016/j.jssc.2005.01.029

DO - 10.1016/j.jssc.2005.01.029

M3 - Article

AN - SCOPUS:15844381190

VL - 178

SP - 1254

EP - 1261

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

SN - 0022-4596

IS - 4

ER -

Synthesis of novel cation-ordered compounds with fluorite-related structure prepared by oxidation of Sn-Ta-O pyrochlore

Abstract

Keywords

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