Ceramics-Silikáty 59, (4) 270 - 274 (2015)

Mixed oxide β-ZrWMoO₈-containing composites with monoclinic zirconia (m-ZrO₂) were prepared in search for zero thermal expansion ceramics over a wide temperature range. Thermomechanical analyzer (TMA) results indicate that the thermal expansion coefficients of the β-ZrWMoO₈-containing composites decrease with increasing amount of β-ZrWMoO₈ and that the composite with 50 wt.% β-ZrWMoO₈ and 50 wt.% m-ZrO₂ exhibits near-zero thermal expansion from 30 to about 600°C. However, its relative density is low. The addition of a small amount of Al(NO₃)₃.9H₂O as a sintering aid increases the density (possibly because the Al³⁺ ion promotes sintering and densification) while affecting the structure and thermal expansion only insignificantly.