Effect of CuO Doping on Electrical Properties of YBCO Ceramics

Based on traditional solid-phase sintering method, three elements, Y1Ba2Cu3O7-x (YBCO) ceramics as functional phase, glass powder as sintering aids and copper(Ⅱ) oxide (CuO) doping as dopant, can be made into the product-the CuO doped YBCO ceramics. Its microstructure, phase composition and electrical properties have been studied by SEM, XRD, EDS, micro ohm instrument and high temperature alternating humidity test chamber. The study has found that doping CuO can reduce the oxygen defects in the crystal structure of YBCO; as the CuO content increases from 0% to 3%, the ceramic density increases gradually while the resistivity decreases obviously; as the content of CuO is more than 3%, the ceramic density decreases gradually while the resistivity increases obviously; with the increase of CuO content, temperature coefficient of resistance (TCR) shifts from negative to positive gradually, and the TCR is becoming smaller and smaller; when the doping amount of CuO is 3%, the sample has the best comprehensive electrical properties-the resistivity is 1.55×10-4 Ω•m and the resistance temperature coefficient is -1 470×10-6 /℃. © 2019,Materials Review Magazine. All right reserved.