Conductivity studies on oxygen-deficient Ruddlesden-Popper phases

✍ Scribed by Carlos Navas; Hans-Conrad zur Loye

• Book ID: 104296399
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 562 KB
• Volume: 93
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(96)00515-2

✦ Synopsis

A new series of doped-Ruddlesden-Popper phases, of general formula Sr,M,_.rM:O,m, (M = Ti, Zr; M' = Al, Ga, In) were synthesized and their conductivity was investigated as a function of temperature and oxygen partial pressure. The highest total conductivity in air is 1.6 X 10e3 S/cm at 950°C for both Sr,Ti,.,,Ga, 2506,875 and Sr,Ti, ,In,, ,O, L)5. Measurements of the conductivity as a function of oxygen partial pressure indicate that p-type electronic conductivity predominates at high ~(0~). while a p(O,)-independent region at intermediate ~(0~) values indicates ionic conductivity. The magnitude of the ionic conductivity at 700°C is approximately IO-' S/cm.