Microstructural and anomalous resistivity behavior of modified ferroelectric Ba6Ti2Nb8O30

• Published in: Ferroelectrics Vol. 215; no. 1; pp. 95 - 102
• Main Authors: Rao, K. Sambasiva, Subrahmanyam, A. S. V., Viswarupachary, P.
• Format: Journal Article
• Language: English
• Published: London Taylor & Francis Group 01-07-1998; Taylor and Francis
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; curie point; Defects and impurities in crystals; microstructure; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Ferroelectricity; Ferroelectricity and antiferroelectricity; microstructure; Niobates, titanates, tantalates, pzt ceramics, etc; Physics; PTCR; Structure of solids and liquids; crystallography; Inorganic compounds; Electrical conductivity; Curie point; Transition element compounds; Ferroelectric ceramics; XRD; Experimental study; Titanium oxides; Ferroelectricity; Barium oxides; Niobium oxides; Anomaly; SEM; Microstructure; Quaternary compounds; Permittivity
• ISSN: 0015-0193; 1563-5112
• DOI: 10.1080/00150199808229553

The present communication describes the preparation and characterisation of Ba
6-3x
R
2
xTi
2
Nb
8
O
30
(where x = 0.0 and 0.05, R = La, Pr, Nd, Sm and Gd) Ceramics. Tetragonal symmetry has been noticed from XRD studies. Microstructural studies using SEM revealed, substitution of rare-earth ion in BTN inhibits the grain growth of BTN. DC resistivity measurements in these compositions indicated PTCR anomalous behaviour. This type of behaviour is explained on the basis of Heywang's model. Curie temperature of rare-earth substituted BTN found to decrease from the value of BTN.