Synthesis, Crystal Structure and Physical Properties of LixMg0.857−xCu2.143O3−y

✍ Scribed by Y. Tsuchiya; K. Oh-ishi

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 261 KB
• Volume: 168
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2002.9690

✦ Synopsis

Solid solutions of Li-doped Mg 0.857 Cu 2.143 O 3 (Li x Mg 0.857Àx Cu 2.143 O 3Ày ) were prepared at 9501C for 12 h in air by the solidstate method using Li 2 CO 3 , MgO and CuO powders. The solid solutions were obtained as the single a phase with the g. uggenite structure in 0%x%0.06 region. With the increasing of the Li content x, the lattice parameters a, b and unit cell volume V decreased, while c increased. On the basis of the charge neutrality, hole carrier estimated by the oxygen content increased with the Li substitution. The Seebeck coefficient at room temperature of x = 0.03 sample was +400 lV/K. The electrical resistivity q at room temperature drastically decreased with the increasing x. Temperature dependences of q for x = 0.01, 0.03 and 0.06 samples were semi-conductive behavior from room temperature to about 12 K. Interaction between Cu 2+ and Cu 2+ through O 2À seems to be somewhat large antiferromagnetic one. Sperconducting transition was not detected in the temperature range.