Ferroelectrics · 2005 · 27 citations · 10 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramic MaterialsCeramicsCrystal StructureDielectric CeramicsDielectricsElectrical Properties Of CeramicsFerroelectric CeramicsFerroelectric MaterialsInorganic MaterialsCeramic DielectricsDielectric ConstantFerroelectric Phase TransitionsNegative Temperature CoefficientNegative Temperature Coefficient Of ResistanceResistivityTemperature Dependence Of Electrical PropertiesX-ray Diffraction Analysis
Polycrystalline samples of Pb 3 R 3 Ti 5 Nb 5 O 30 (R = La and Sm) have been synthesized by a high-temperature solid-state reaction technique. X-ray diffraction (XRD) analysis of the compounds showed the formation of single phase compounds in an orthorhombic crystal structure. Studies of dielectric constant (ϵ) of the above compounds as a function of temperature (25 to 375°C) at 10 kHz exhibit a ferroelectric phase transition of diffuse type. Temperature variation of dc resistivity/conductivity shows that these compounds exhibit negative temperature coefficient of resistance (NTCR).
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The diffuse phase transition in potassium strontium niobate
R. M. Clarke, J C Burfoot · Ferroelectrics · 1974 · 153 citations