The effects of MgO and Mg(OH) 2 on the phase formation and properties of 0.97MgTiO3-0.03SrTiO3 ceramics were investigated. MgTi2O5 formed in pellets added with MgO (MST) and disappeared in pellets added with Mg(OH)2 (MHST). Abnormal grain growth was observed in MHST due to different reactions during the heating process. Values of σr = 20-22.1, Q × f = 16,500-23,000 GHz and τ f =-5.2 to 4.1 ppm/°C and of σr = 17.3-17.7, Q × f = 31,300-48,600 GHz and σr =-9.1 to 0.9 ppm/°C were measured for MST and MHST, respectively. Lower er for MHST was caused by a lower density. Q × f increased and τf shifted to more negative values when Mg(OH)2 was used instead of MgO.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry