Structure and properties of the La2–<i>x</i>Sr<i>x</i>CuO4–<i>y</i> phase formed during oxidation of the metallic precursor
V. P. NaberezhnykhPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskВ. І. ТкачPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskA. I. LimanovskiiPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskV. Yu. KamenevaPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskO. N. BeloshovPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskI. A. GainaPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskT. I. Pan’koPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Donetsk
ABI
Abstract
Ductile ribbons of the alloy La2–xSrxCu (x = 0.1–0.2) having a partially crystalline structure were prepared by quenching the melt on a rotating disk. It was found that oxidation of the ribbons during continuous heating up to 1173 K or isothermal holding in the temperature interval 1153–1373 K leads to the formation of the equilibrium oxide La2–xSrx CuO4–y with an orthorhombic structure. The oxide was found to be oxygen-deficient, and this accounts for the semiconductor nature of the temperature dependence of resistivity down to 4.2 K.
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