Synthesis, Stoichiometry, and Electrical Transport Properties of (Cd1−xMnx)Mn2O4

✍ Scribed by Paolo Ghigna; Giovanni Battista Barbi; Gaetano Chiodelli; Giorgio Spinolo; Lorenzo Malavasi; Giorgio Flor

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 152 KB
• Volume: 153
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2000.8746

✦ Synopsis

This paper describes the synthesis and discusses the thermal stability, oxygen and cation stoichiometry, and electrical transport properties of Cd/Mn spinel materials. It has been found that an e4ective synthesis can be obtained by reacting in the solid state CdO and Mn 2 O 3 in a closed quartz ampoule at 8003C. By following this synthetic procedure it was possible to prepare materials with di4erent Cd/Mn ratios. The as-prepared spinels are slightly understoichiometric in the oxygen content, but at appropriate T and P(O 2 ) they became overstoichiometric. The electrical transport takes place by motion of electron holes that are created by oxygen overstoichiometry at low T. At higher temperatures a di4erent conduction mechanism is active. This mechanism is likely related to the thermal promotion of electrons from the valence into the conduction band.