A structure, conductivity and dielectric properties investigation of A3CoNb2O9 (A=Ca2+, Sr2+, Ba2+) triple perovskites
- 1. Research School of Chemistry, Australian National University, Solid State Structural Chemistry, Canberra, ACT 0200 (Australia)
- 2. Research School of Chemistry, The Australian National University, Solid State Structural Chemistry, Canberra, ACT 0200 (Australia)
- 3. Bragg Institute, Australian Nuclear Science and Technology Organisation, PMB 1, Menai NSW 2234 (Australia)
- 4. Institute of Environmental Science and Engineering, Nanyang Technological University (NTU), Innovation Centre Block 2, Unit 247, 18 Nanyang Drive, Singapore 637723 (Singapore)
Description
The room temperature structures as well as the temperature-dependent conductivity and dielectric properties of the A3CoNb2O9 (A=Ca2+, Sr2+ and Ba2+) triple perovskites have been carefully investigated. A constrained modulation wave approach to Rietveld structure refinement is used to determine their room temperature crystal structures. Correlations between these crystal structures and their physical properties are found. All three compounds undergo insulator to semiconductor phase transitions as a function of increasing temperature. The hexagonal Ba3CoNb2O9 compound acts as an insulator at room temperature, while the monoclinic Ca3CoNb2O9 compound is already a semiconductor at room temperature. The measured dielectric frequency characteristics of the A=Ba compound are excellent
Additional details
Identifiers
- DOI
- 10.1016/j.jssc.2004.09.016;
- PII
- S0022-4596(04)00514-6;
Publishing Information
- Journal Title
- Journal of Solid State Chemistry
- Journal Volume
- 177
- Journal Issue
- 12
- Journal Page Range
- p. 4428-4442
- ISSN
- 0022-4596
- CODEN
- JSSCBI
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 36096997
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Descriptors DEI
- BARIUM COMPOUNDS; BARIUM IONS; CALCIUM COMPOUNDS; CALCIUM IONS; DIELECTRIC MATERIALS; DIELECTRIC PROPERTIES; MONOCLINIC LATTICES; NIOBIUM COMPOUNDS; OXIDES; PEROVSKITES; PHASE TRANSFORMATIONS; SEMICONDUCTOR MATERIALS; STRONTIUM COMPOUNDS; STRONTIUM IONS; TEMPERATURE DEPENDENCE
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; CHARGED PARTICLES; CRYSTAL LATTICES; CRYSTAL STRUCTURE; ELECTRICAL PROPERTIES; IONS; MATERIALS; MINERALS; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; REFRACTORY METAL COMPOUNDS; TRANSITION ELEMENT COMPOUNDS
Optional Information
- Copyright
- Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.