Electrical properties of ZrO₂ in nano- and polycrystalline states at high pressure

• Main Authors: Korionov, I.V., Trefilova, A.N., Babushkin, A.N., Korionova, I.G., Shumina, U.N., Lojkowski, W., Opalinska, A.
• Format: Article
• Language: English
• Published: Донецький фізико-технічний інститут ім. О.О. Галкіна НАН України 2007
• Series: Физика и техника высоких давлений
• Online Access: http://dspace.nbuv.gov.ua/handle/123456789/70292

We present the results of the research work devoted to the problem: how the crystallites influence the electrical properties of stabilized zirconia at pressures of 22−50 GPa and in the temperature range of 77−450 K. The measurements were conducted in the highpressure chamber under direct current on nanocrystalline powders of ZrO₂ stabilized by Pr (0.5%) and on compact powder samples of «partially stabilized» ZrO₂ including 5% Y₃P₃. The nanocrystallite size equals 10, 12 and 56 nm. The change of electronic properties of stabilized zirconia at 31.5–37.5 GPa, 40–44 GPa and 45.5–48.5 GPa in nano- and polycrystalline states has been discovered. It gives us a possibility to verify the phase diagram of ZrO₂ at those intervals of pressure. Besides, it has been revealed that stabilization as nanocrystallinity leads to appearance of additional mechanisms of conductivity in ZrO₂.