EFFECT OF HIGH-ENERGY ELECTRON IRRADIATION ON THE STRUCTURAL, DIELECTRIC, AND NONLINEAR OPTICAL PROPERTIES OF SINGLE CRYSTALS OF Pb5(Ge1–хSix)3O11 (0 ≤ x ≤ 0.55) SOLID SOLUTIONSстатья
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Аннотация:Stoichiometric single crystals of Pb5(Ge1–хSix)3O11 solid solutions (0 ≤ x ≤ 0.55) are obtained by slow cooling of 5PbO⋅3(1–y)GeO2⋅3ySiO2 melts. The chemical analysis confirms their cation and anion stoichiometry. The effect of their high-energy (10 MeV) electron irradiation with fluences from 0.1⋅1018 e/cm2 to 4.39⋅1018 e/cm2 on the structural, ferroelectric, and nonlinear optical characteristics of the crystals is studied for the first time. The dependence of crystals on concentrations and fluences is detected. According to the date of dielectric spectroscopy and second harmonic generation of laser radiation, the doping with Si causes a systematic shift of Tc to low temperatures, a decrease in the peak value of the dielectric permittivity, and a noticeable phase transition smearing with transforming to the zelaxor ferrollectric state of x = 0.35. According to the structural studies of initial and irradiared, Pb5(Ge1–xSix)3O11 crystals, they retain the structural perfectness without any signs of amorphization. Structural distortions of Pb5(Ge1–xSix)3O11 do not significantly depend on the fluence.
