Electrical properties of Ln<inf>2</inf>Mo<inf>2</inf>O<inf>7</inf> pyrochlores (Ln=Smî—¸Yb,Y)

Cubic oxide pyrochlores, Ln2Mo2O7, Ln=SmYb,Y, (Nd1−xAx), A=Er and Yb; 0 < x < 1.0, have been synthesized and electrical properties were examined in the range 77-600K. Semiconductor behavior is observed for Ln=EuYb, Y but the resistivity and Ea are low. Sm2Mo2O7 and Nd1−xYbxMo2O7 (0.05 ≤ x ≤ 0.1) exhibit semimetallic or metallic behavior. The mechanism of conduction in these compounds is explained on the basis of band model proposed by Sleight et al. © 1980, All rights reserved.