Effect of Uniaxial Pressure on the Ferroelectric Phase Transition in Pb5Ge3O11:Ba Crystals
A. Molaka, M. Koralewskib, G.A. Saundersc and W. Juszczyka
aInstitute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
bInstitute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
cDepartment of Physics, University of Bath, Claverton Down, Bath, BA2 7AY England
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Received: 29 03 2005;
The effect of uniaxial pressure up to 1 kbar applied perpendicular and parallel to c-axis, on the Curie temperature and electric permittivity εc of Ba-doped Pb5Ge3O11 single crystals was investigated. The Curie temperature decreases with uniaxial pressure and the coefficient γii ≡ δTc/ δXi) is determined as -7 and -11 K kbar-1 for the b- and c-axes, respectively. It was found that uniaxial pressure increases the phase transition diffuseness and the tricritical point cannot be achieved for this pyroelectric and ferroelectric single crystal.
DOI: 10.12693/APhysPolA.108.513
PACS numbers:77.80.Bh, 77.84.Bw