The ferroelectric phase transition in tridymite type BaAL2O4 studied by electron microscopy
作者： A. M. Abakumov , O. I. Lebedev , L. Nistor , G. Van Tendeloo , S. Amelinckx
DOI: 10.1080/01411590008224545
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摘要: Abstract The paraelectric-ferroelectric (PE-FE) phase transition in stuffed tridymite BaAl2O4 was studied situ by transmission electron microscopy. Electron diffraction revealed that the PE and FE phases have hexagonal symmetry. PE-FE is accompanied a doubling of cell dimensions a-b plane. reversible, takes place over wide temperature range (400–670 K.) interfaces related to fluctuating character. crystal structure high determined resolution structures (space group P6322, a≈ 5.22 A, c ≈ 8.8 A) P63, a= 10.4469(1)A, = 8.7927(1)A) differ mainly configuration Al-O strings oriented along c-axis. In all are equivalent whereas straight corrugated alternate an ordered manner resulting b parameters. Translat...
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