Diffusion controlled formation of β type phases in the system ZrO2Zr3N4

✍ Scribed by M. Lerch; F. Krumeich; R. Hock

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 569 KB
• Volume: 95
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(96)00549-8

✦ Synopsis

6 type phases, formed by a diffusive process during cooling ZrO_,,N,z,, down below lOOO"C, have been investigated structurally by XRD and TEM methods. They show trigonally distorted fluorite structures with anion vacancies ordered along the unique axis. The individual p type phases (p, j3', p") can be described by arrangements of Bevan clusters (Zr,O,N,) and Zr,O,, units stacked along this direction. For the oxygen rich p' phase, prepared by quenching the high temperature phase in water, an average sequence of one Bevan cluster and one Zr,O,, unit is detected. An average modulation length corresponding to cp,, = 4.1~~ is observed in the case of the p" phase. The basic building unit to form the structure of the p phase is only the Bevan cluster.