Crystallization of SrB4O7 in a glass tape and its electrical, dielectric, ferroelectric and nonlinear optical properties

This paper presents the results of an investigation of the electrical, dielectric,ferroelectric, and second-order nonlinear optical properties ofSrB4O7 synthesized by methods of both solid-state reaction (SSR)and crystallization of a glass tape (GT). To obtain GTs of SrB4O7,the melt consisting of appropriate precursors was rapidly cooled using a twin-roller. The preparedGTs were crystallized at 730°C for different durations and analyzed by X-raydiffraction. The formation of “extended” crystals in the central part of GTs due to theapplication of the GT technology is discussed. The investigation of the current-voltagecharacteristic of the sample prepared by SSR showed that its breakdown voltage is higher than 1000 V. The measurements of the dielectric parameters in the frequency range of 1 KHz–1 MHz showed thatthe dielectric constant is about 7.5, and the dielectric loss varies from 0.002 to 0.0008. Theseparameters are sufficiently stable in the temperature range from room temperature to150°C. The ferroelectric properties of the GT crystallized at 730°C for 3 h were also investigated. At 20 kV/cm, a remnant polarization of 0.18 μC/cm2 was measured. Optical measurements showed that the intensity ofsecond-harmonic generation in the GT crystallized at 730°C for 3 h is 5.4 timeshigher than that of KH2PO4 (KDP).