Published 2010 | Version v1
Miscellaneous Open

Effect of Sr2+ addition on electrical properties of BaTiO3 PTCR ceramics

Creators

  • 1. Universidade Federal de Sao Carlos (UFSCar), SP (Brazil). Dept. de Engenharia de Materiais

Description

Semiconducting PTCR (Positive Temperature Coefficient of Resistivity) ceramics based in BaTiO3, Ba0,8Sr0,2TiO3 e Ba0,6Sr0,4TiO3 compositions with 0.3at% La-doped have been investigated. The substitution of Ba2+ by Sr2+ in the lattice resulted in a decrease of tetragonal to cubic transition temperature (Tc) observed by X-ray diffraction. The results have shown a strong dependence of structure with the resistivity measured in d.c. mode. Using impedance spectroscopy technique was possible to attribute the PTC effect entirely to grain boundary region resistance. AFM and EFM images have shown potential barriers on the grain boundaries of evaluated samples below and above Tc.(author)

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Additional details

Additional titles

Original title (Portuguese)
Efeito da adicao de Sr

Publishing Information

Imprint Pagination
8 p.
Report number
INIS-BR--8974

Conference

Title
Brazilian congress on engineering and materials science
Original Conference Title
19. CBECIMAT: Congresso brasileiro de engenharia e ciencia dos materiais
Acronym
19. CBECIMAT
Dates
21-25 Nov 2010
Place
Campos do Jordao, SP (Brazil)

INIS

Country of Publication
Brazil
Country of Input or Organization
Brazil
INIS RN
42044027
Subject category
S36: MATERIALS SCIENCE; S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Resource subtype / Literary indicator
Conference
Descriptors DEI
ATOMIC FORCE MICROSCOPY; BARIUM; CRYSTALLOGRAPHY; CUBIC LATTICES; DIFFUSE SCATTERING; DISLOCATION PINNING; GRAIN BOUNDARIES; GRAIN GROWTH; IMPEDANCE; SCANNING TUNNELING MICROSCOPY; STRONTIUM; STRONTIUM TITANATES; STRUCTURAL CHEMICAL ANALYSIS; TETRAGONAL LATTICES; X RADIATION; X-RAY DIFFRACTION
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; ALKALINE EARTH METALS; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIFFRACTION; ELECTROMAGNETIC RADIATION; ELEMENTS; IONIZING RADIATIONS; METALS; MICROSCOPY; MICROSTRUCTURE; OXYGEN COMPOUNDS; RADIATIONS; SCATTERING; STRONTIUM COMPOUNDS; TITANATES; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS

Optional Information

Notes
Code: 110-020.pdf