RESrAlO_4 (RE=Nd and La): a new type of perovskite ceramic substrate for Bi-Sr-Ca-Cu-O superconducting thick films

摘要

A suitable new type of substrate RESrAlO_4 (RE=Nd and La) for making Bi2212 thick films has been synthesized by solid state reaction. X-ray diffraction indicated that both compounds are single phase when synthesized at 1350-1500 deg C The compounds are both of tetragonal structure and have high melting points together with low dielectric constants and energy loss. They are chemically compatible with Bi2212. Strongly c-axis oriented Bi2212 thick films with a T_(co) of 85 K were successfully grown on the polycrystalline substrates. RESrAlO_4 is suitable for use as a substrate material for growing Bi-Sr-Ca-Cu-O (BSCCO) thick films for microwave devices.