Abstract
This study reports on impulse excitation technique (IET) measurements up to 900 °C in air performed on various grades of ZnO ceramics, containing bismuth and antimony oxides as dopants. The IET provides dynamic elastic (E-modulus) and damping properties as a function of temperature. In order to correlate the IET behaviour with the microstructure and phase evolution, SEM and high temperature XRD (HT-XRD) analysis were carried out. Damping peaks related to phase transitions were observed in the samples containing Bi 2O 3 intergranular phase. Three other peaks are tentatively interpreted as point defect relaxations.
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