Journal
FERROELECTRICS
Volume 509, Issue 1, Pages 64-73Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00150193.2017.1293452
Keywords
Compositional ordering; lead iron niobate; PFN; Neel temperature; resistivity; PTCR; Mossbauer spectra
Funding
- Ministry of Education and Science of the Russian Federation [3.5346.2017/BP]
- Research Committee of the University of Macau [RDG007/FST-CHD/2012]
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Neel temperature of Pb(Fe1/2Nb1/2)O-3 ceramics sintered at 1120 degrees C and quenched to room temperature was revealed to be 25K higher than that of the same ceramics slowly cooled at a rate of 50K/h. A small singlet component, typical for compositionally ordered perovskites, is present in the room-temperature Mossbauer spectrum of the slowly cooled sample. It proves that the quenched sample is more compositionally disordered than the slowly-cooled one. Substantially higher room-temperature resistivity values and positive temperature coefficient of resistivity of the slowly cooled sample are attributed to the formation of the grain-boundary potential barriers due to oxidation during slow cooling.
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