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The synthesis of a series of side-chain liquid crystalline siloxane copolymers is reported, and comparative studies of physical properties of members of the series with different side-chain length have been attempted. All the five members show smectic C * and smectic A phases. Measurements of ferroelectricity, relaxation times and electroclinic properties have been carried out, aiming at...
Phase pure bismuth titanate was prepared at 750°C from the corresponding hydroxide precursors. Sintering behavior of this powder was evaluated in comparison with powder obtained from a sol-gel process. A maximum of about 87% of the theoretical density was achieved for sintered ceramics processed from powders prepared by the above two methods. Microstructural studies revealed large grains as well as...
Lead, zirconium and titanium were coprecipitated from their aqueous salt solutions using oxalic acid. The precipitate on heating to 850°C gave phase pure PZT powder which showed good sinterability. The average grain size in the pellets sintered at 900°C for 6 h was about 1 μm. Barium and strontium were found to coprecipitate with lead facilitating partial substitution. Barium modified samples showed...
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