The Effect of Excess PbO on Crystal Structure, Microstructure and Dielectric Properties of (Pb0.50Sr0.50)TiO3 Ceramics

作者：Sumang Rattiphorn; Vittayakorn Naratip; Bongkarn Theerachai^*

来源：Ferroelectrics, 2013, 456(1): 98-106.

DOI：10.1080/00150193.2013.846651

• Excess PbO
• tetragonality
• lead strontium titanate
• dielectric properties

Lead strontium titanate [(Pb50Sr50)TiO3; PST] ceramics were fabricated by the conventional solid state reaction method using calcination and sintering temperatures of 950 degrees C and 1250 degrees C. To prevent PbO evaporation during the firing processes, excess PbO was added to the samples in varying amounts from 0-10wt.%. It was found that PST powders indexed in a tetragonal structure. Impurity phases were detected in the calcined powders which had excess PbO higher than 3wt%. A pure perovskite phase was obtained from all ceramic samples. The lattice parameters a, c and the c/a ratio decreased with an increasing excess of PbO. The average particle size and the average grain size increased with the increase of PbO. The porous microstructure slightly decreased with an increasing amount of PbO, up to 1wt.%, then slightly increased with higher excess PbO. The density can be improved by adding 1wt.% of excess PbO. The dielectric constant increased from 7500 for the 0wt.% sample to 8300 for the 1wt%. This was followed by reductions for 3, 5 and 10wt.%. The Curie temperature and transition enthalpy slightly increased with an increase amount of PbO until 1wt.%, then slightly decreased, for the higher excess PbO.

• 出版日期2013-1-1