Synthesis and Structures of Reduced Niobates with Four Perovskite-like Layers and Their Semiconducting Properties

W. Sugimoto; H. Ohkawa; M. Naito; Y. Sugahara; K. Kuroda

doi:10.1006/jssc.1999.8488

Synthesis and Structures of Reduced Niobates with Four Perovskite-like Layers and Their Semiconducting Properties

W. Sugimoto, H. Ohkawa, M. Naito, Y. Sugahara, K. Kuroda

School of Advanced Science and Engineering

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

7 Citations (Scopus)

Abstract

Carriers were successfully doped into RbCa₂NaNb₄O₁₃ by the substitution of Sr²⁺ for Na⁺, yielding electroconducting niobates with a layered structure consisting of four perovskite-like layers. Single-phase products of polycrystalline RbCa₂Na_1-xSr_xNb₄O₁₃ (x = 0.2 and 0.4) were synthesized by the solid-state reaction of RbCa₂Nb₃O₁₀, Sr₅Nb₄O₁₅, Nb₂O₅, and Nb metal. The solid solutions were indexed based on a tetragonal structure, corresponding to the end-member RbCa₂NaNb₄O₁₃. With the increase in the amount of strontium substitution, an expansion of the c-axis was observed while the a-axis was essentially constant. The products showed semiconducting properties.

Original language	English
Pages (from-to)	508-512
Number of pages	5
Journal	Journal of Solid State Chemistry
Volume	148
Issue number	2
DOIs	https://doi.org/10.1006/jssc.1999.8488
Publication status	Published - 1999 Dec

Keywords

Electrical conduction
Layered perovskite
Niobate
Reduced oxidation state
Rietveld analysis
Solid-state reaction

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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title = "Synthesis and Structures of Reduced Niobates with Four Perovskite-like Layers and Their Semiconducting Properties",

abstract = "Carriers were successfully doped into RbCa2NaNb4O13 by the substitution of Sr2+ for Na+, yielding electroconducting niobates with a layered structure consisting of four perovskite-like layers. Single-phase products of polycrystalline RbCa2Na1-xSrxNb4O13 (x = 0.2 and 0.4) were synthesized by the solid-state reaction of RbCa2Nb3O10, Sr5Nb4O15, Nb2O5, and Nb metal. The solid solutions were indexed based on a tetragonal structure, corresponding to the end-member RbCa2NaNb4O13. With the increase in the amount of strontium substitution, an expansion of the c-axis was observed while the a-axis was essentially constant. The products showed semiconducting properties.",

keywords = "Electrical conduction, Layered perovskite, Niobate, Reduced oxidation state, Rietveld analysis, Solid-state reaction",

author = "W. Sugimoto and H. Ohkawa and M. Naito and Y. Sugahara and K. Kuroda",

note = "Funding Information: Y.S. thanks the Advanced Research Center for Science and Engineering at Waseda University for {"}nancial support as Individual Research. This work was {"}nancially supported in part by a Grant-in-Aid for JSPS Fellows (5727) from the Ministry of Education, Science, Sports, and Culture, Japan.",

year = "1999",

month = dec,

doi = "10.1006/jssc.1999.8488",

language = "English",

volume = "148",

pages = "508--512",

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AU - Sugimoto, W.

AU - Ohkawa, H.

AU - Naito, M.

AU - Sugahara, Y.

AU - Kuroda, K.

N1 - Funding Information: Y.S. thanks the Advanced Research Center for Science and Engineering at Waseda University for "nancial support as Individual Research. This work was "nancially supported in part by a Grant-in-Aid for JSPS Fellows (5727) from the Ministry of Education, Science, Sports, and Culture, Japan.

PY - 1999/12

Y1 - 1999/12

N2 - Carriers were successfully doped into RbCa2NaNb4O13 by the substitution of Sr2+ for Na+, yielding electroconducting niobates with a layered structure consisting of four perovskite-like layers. Single-phase products of polycrystalline RbCa2Na1-xSrxNb4O13 (x = 0.2 and 0.4) were synthesized by the solid-state reaction of RbCa2Nb3O10, Sr5Nb4O15, Nb2O5, and Nb metal. The solid solutions were indexed based on a tetragonal structure, corresponding to the end-member RbCa2NaNb4O13. With the increase in the amount of strontium substitution, an expansion of the c-axis was observed while the a-axis was essentially constant. The products showed semiconducting properties.

AB - Carriers were successfully doped into RbCa2NaNb4O13 by the substitution of Sr2+ for Na+, yielding electroconducting niobates with a layered structure consisting of four perovskite-like layers. Single-phase products of polycrystalline RbCa2Na1-xSrxNb4O13 (x = 0.2 and 0.4) were synthesized by the solid-state reaction of RbCa2Nb3O10, Sr5Nb4O15, Nb2O5, and Nb metal. The solid solutions were indexed based on a tetragonal structure, corresponding to the end-member RbCa2NaNb4O13. With the increase in the amount of strontium substitution, an expansion of the c-axis was observed while the a-axis was essentially constant. The products showed semiconducting properties.

KW - Electrical conduction

KW - Layered perovskite

KW - Niobate

KW - Reduced oxidation state

KW - Rietveld analysis

KW - Solid-state reaction

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Synthesis and Structures of Reduced Niobates with Four Perovskite-like Layers and Their Semiconducting Properties

Abstract

Keywords

ASJC Scopus subject areas

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