Structural, dielectric and electrical properties of LiBa2X5O15 (X Nb and Ta) ceramics
- 1. P.G.Department of Physics, Sambalpur University, Burla 768 019, Sambalpur (India)
- 2. Department of Physics and Meteorology, IIT, Kharagpur 721 302 (India)
Description
The polycrystalline complex tungsten-bronze (TB) type compounds LiBa2Nb5O15 (LBN) and LiBa2Ta5O15 (LBT) were prepared by a high-temperature solid-state reaction technique. X-ray diffraction (XRD) study confirmed the formation of single-phase orthorhombic compounds in the crystal system at room temperature. Microstructural analysis of the surface of the compounds by scanning electron microscopy (SEM) suggests that small grains are uniformly distributed on the surface of the samples. Detailed studies of the dielectric properties suggest that they have undergone a phase transition well above the room temperature. Measurements of electrical conductivity (dc) as a function of temperature confirm the semiconducting properties of the compounds much above the room temperature with negative temperature coefficient of resistance (NTCR) behaviour
Additional details
Identifiers
- DOI
- 10.1016/j.matchemphys.2005.12.022;
- PII
- S0254-0584(05)00864-3;
Publishing Information
- Journal Title
- Materials Chemistry and Physics
- Journal Volume
- 100
- Journal Issue
- 1
- Journal Page Range
- p. 138-141
- ISSN
- 0254-0584
- CODEN
- MCHPDR
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 38079132
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- BARIUM OXIDES; CERAMICS; DIELECTRIC MATERIALS; DIELECTRIC PROPERTIES; ELECTRIC CONDUCTIVITY; LITHIUM OXIDES; NIOBIUM OXIDES; ORTHORHOMBIC LATTICES; PHASE TRANSFORMATIONS; POLYCRYSTALS; SCANNING ELECTRON MICROSCOPY; TANTALUM OXIDES; TEMPERATURE COEFFICIENT; TEMPERATURE RANGE 0273-0400 K; TUNGSTEN BRONZE; X-RAY DIFFRACTION
- Descriptors DEC
- ALKALI METAL COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; ALLOYS; BARIUM COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; COPPER ALLOYS; COPPER BASE ALLOYS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CRYSTALS; DIFFRACTION; ELECTRICAL PROPERTIES; ELECTRON MICROSCOPY; LITHIUM COMPOUNDS; MATERIALS; MICROSCOPY; NIOBIUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; REACTIVITY COEFFICIENTS; REFRACTORY METAL COMPOUNDS; SCATTERING; TANTALUM COMPOUNDS; TEMPERATURE RANGE; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENT COMPOUNDS; TUNGSTEN ALLOYS
Optional Information
- Copyright
- Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.