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

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-...

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Bibliographic Details
Published inJournal of solid state chemistry Vol. 148; no. 2; pp. 508 - 512
Main Authors Sugimoto, W., Ohkawa, H., Naito, M., Sugahara, Y., Kuroda, K.
Format Journal Article
LanguageEnglish
Published San Diego, CA Elsevier Inc 01.12.1999
Elsevier
Subjects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Conductivity phenomena in semiconductors and insulators
electrical conduction
Electronic transport in condensed matter
Exact sciences and technology
Inorganic compounds
layered perovskite
Low-field transport and mobility; piezoresistance
niobate
Physics
reduced oxidation state
Rietveld analysis
Salts
solid-state reaction
Structure of solids and liquids; crystallography
Structure of specific crystalline solids
niobate
electrical conduction
solid-state reaction
reduced oxidation state
Rietveld analysis
layered perovskite
Inorganic compounds
Electrical conductivity
Semiconductor materials
Layered crystals
Sodium niobates
Calcium Niobates
Perovskites
XRD
Experimental study
Ion substitution
Chemical preparation
Solid state reaction
Strontium niobates
Chemical composition
Rubidium Niobates
Crystal structure
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Summary: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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.1999.8488