A novel metathesis route for the synthesis of L_a2CuO₄ and its superconducting analogues: synthesis of a new lithium-substituted derivative of La₂CuO₄

Abstract

The metathesis reaction, Li₂CuO₂ + 2 LnOCl → Ln₂CuO₄ + 2 LiCl, (Ln = La, Nd), provides a convenient route for the synthesis of La₂CuO₄ and Nd₂CuO₄ at relatively low temperatures (700-800 °C). Use of Sr/Ba-substituted LaOCl in the above reaction enables synthesis of superconducting analogues, La_1.85A_0.15CuO₄ (A = Sr, Ba), as well. A new lithium-substituted derivative of nominal composition La_1.8Li_0.2CuO₄ has also been synthesized in the metathesis reaction between Li₂CuO₂ and La(OH)₃.