Journal Article

Evolution of the Crystal Structure and the Dielectric Properties of (Pb0.86Sr0.14)5Ge3O11 Single Crystals under High-Energy Electron Irradiation

Bush, A. A., Stash, A. I., Kozlov, V. I., Ivanov, S. A., Boyko, V. M.

2023

Overview

Single crystals of (Pb 0.86 Sr 0.14 ) 5 Ge 3 O 11 are prepared by a slow melt cooling. The effect of high-energy electron irradiation with fluences up to 6.2·10 18  e/cm 2 on the structural and dielectric properties of these crystals is studied; the dependence of crystal structure parameters on the fluences is considered; the structural mechanism of selective substitution of Pb by Sr is established. It is determined that the sites occupied by lead with a lone pair are not substituted by strontium cations. Up to the fluences of 6.2·10 18  e/cm 2 , the (Pb 0.86 Sr 0.14 ) 5 Ge 3 O 11 structure remains perfect. It is shown that the irradiation with these fluences preserves the paraelectric structure at 293 K ( space group) and causes only minor atomic displacements. The temperature dependences of the dielectric permittivity and the dielectric loss (in the ranges of 5-300 K and 1-1000 kHz) show that the irradiation shifts T C from 158 K to 145 K and increases the diffusion of the ferroelectric phase transition.

• Publisher: Pleiades Publishing,Springer Nature B.V
• Subject: Atomic / Atomic/Molecular Structure and Spectra / Chemistry / Chemistry and Materials Science / Crystal structure / Dielectric loss / Dielectric properties / Electron irradiation / Ferroelectricity / Ferroelectrics / High energy electrons / Inorganic Chemistry / Molecular / Neutrons / Optical and Plasma Physics / Phase transitions / Physical Chemistry / Physics / Radiation / Single crystals / Solid solutions / Solid State Physics