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Effect of Uniaxial Pressure on the Ferroelectric Phase Transition in Pb_5Ge_3O_{11}:Ba Crystals

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Molak A., Koralewski M., Saunders G., Juszczyk W.
Acta Physica Polonica A
|
2005
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vol. 108
|
issue 3
513-520
EN
The effect of uniaxial pressure up to 1 kbar applied perpendicular and parallel to c-axis, on the Curie temperature and electric permittivityε_c of Ba-doped Pb_5Ge_3O_{11} single crystals was investigated. The Curie temperature decreases with uniaxial pressure and the coefficientγ_i (γ_i ≡ δ T_{c}/δ X_i) 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.
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