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The effect of uniaxial pressure up to 1 kbar applied perpendicular and parallel to c-axis, on the Curie temperature and electric permittivity ec of Ba-doped Pb5Ge3O11 single crystals was investigated. The Curie temperature decreases with uniaxial pressure and the coefficient γi (γi ≡ δT c/δXi) is determined as –7 and –11 K kbar−1 for the band 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.

Effect of Uniaxial Pressure on the Ferroelectric Phase Transition in Pb5Ge3O11:Ba Crystals

Effect of Uniaxial Pressure on the Ferroelectric Phase Transition in Pb₅Ge₃O₁₁:Ba Crystals