Growth and dielectric properties of congruently melting Ba1-xCaxTiO3 crystals

Autor(en): Kuper, C
Pankrath, R
Hesse, H
Stichwörter: BATIO3; Materials Science; Materials Science, Multidisciplinary; Physics; Physics, Applied; TITANATE
Erscheinungsdatum: 1997
Herausgeber: SPRINGER VERLAG
Journal: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volumen: 65
Ausgabe: 3
Startseite: 301
Seitenende: 305
Zusammenfassung: 
The phase diagram of the system BaTiO3-CaTiO3 is investigated with regard to a congruently melting composition. The liquidus curve is determined from x = 0.0 to 0.3, where x is the mole fraction of CaTiO3. It shows a minimum melting point near x = 0.23. Ba1-xCaxTiO3 crystals are grown by the Czochralski technique from melts close to this composition. X-ray fluorescence analyses of the crystals indicate a congruently melting composition at x = 0.227, corresponding to the observed minimum melting point. At the growth temperature the crystals possess a cubic perovskite-type structure. They undergo a structure change to the ferroelectric tetragonal phase at 98 /- 3 degrees C, indicated by a sharp peak of the dielectric constant. Down to -120 degrees C no further phase transition is observed.
ISSN: 09478396
DOI: 10.1007/s003390050583

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