Doping Effect on Ferroelectric Microstructure in YMn1 −xTixO3

Autor:	Takuro Katsufuji, Yoichi Horibe, Shigeo Mori, T. Asada, J. Tokunaga, Yasumasa Koyama
Rok vydání:	2007
Předmět:	Crystallography Materials science Structural change Transmission electron microscopy Phase (matter) Doping Magnetocapacitance Trigonal crystal system Condensed Matter Physics Microstructure Ferroelectricity Electronic Optical and Magnetic Materials
Zdroj:	Ferroelectrics. 348:170-176
ISSN:	1563-5112 0015-0193
DOI:	10.1080/00150190701196393
Popis:	We have investigated microstructures related to anomalous ferroelectric properties such as the magnetocapacitance effect in magnetic ferroelectric compounds YMn 1 − x Ti x O 3 and (Y,A)Mn 0.825 Ti 0.175 O 3 (A = La, Ca, Zr) mainly by the transmission electron microscopy. It is found that the size of the ferroelectric domains in YMn 1 − x Ti x O 3 depends strongly on the Ti concentration (x) and the size is estimated to be about 10–20 nm in the x = 0.175 compound. In addition, structural change from the ferroelectric P6 3 cm phase to the rhombohedral one was found in the x = 0.40 compound. On the other hand, characteristic diffuse scattering elongating along both the [001] and [110] direction was found in (Y,Zr)Mn 0.825 Ti 0.175 O 3 , which is similar to that found in the x = 0.175 compound. It is revealed that the partial substitution in YMnO 3 breaks the long-ranged FE ordering and structural fluctuation is induced, which should be responsible for the anomalous FE behaviors in these compounds.
Databáze:	OpenAIRE
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