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Thermal and X-Ray Diffraction Studies of Doped and Undoped Single Crystal and Polycrystalline BaTiO3

Published online by Cambridge University Press:  16 February 2011

L.G. Carreiro ,
J.V. Marzik  and
K.K Deb
L.G. Carreiro
Affiliation:
US Army Research Laboratory, Materials Directorate, Watertown, MA 02172
J.V. Marzik
Affiliation:
US Army Research Laboratory, Materials Directorate, Watertown, MA 02172
K.K Deb
Affiliation:
US Army Research Laboratory, Infrared/Optics Technology Office, Fort Belvoir, VA 22060
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Abstract

Calorimetric changes in a series of pure and doped single crystal and polycrystalline BaTiO3 were studied using differential scanning calorimetry over the temperature range of-110°C to 200°BC. The dopants, oxides of niobium and iron were varied from 0.5 to 8 mole percent, and strontium was varied from 5 to 35 mole percent. Endotherms were observed corresponding to three crystallographic transitions. The highest observed thermal transition corresponds to a tetragonal to cubic crystallographic transition and is also associated with the Curie temperature in these materals. Two additional endothermic transitions were also observed, an intermediatetemperature orthorhombic to tetragonal transition, and a low-temperature rhombohedral to orthorhombic transition. The three dopants decreased the crystallographic transition temperatures and Curie temperature as the dopant concentration was increased. X-ray diffraction was used to identify phases present and to determine the extent of solid solution. It is expected that these materials will display improved infrared detection as well as opto-electronic properties.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 360 , 1994 , 543
Copyright
Copyright © Materials Research Society 1995

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