Low Firing Temperatures and High Ferroelectric Properties of (Ba0.85Ca0.15)(Ti0.90Zr0.10)O-3 Lead-Free Ceramics Synthesized by the Combustion Technique

作者：Kornphom Chittakorn; Vittayakorn Naratip; Bongkarn Theerachai^*

来源：Ferroelectrics, 2016, 491(1): 44-53.

DOI：10.1080/00150193.2015.1070239

• BCTZ
• crystal structure
• microstructure
• combustion technique
• ferroelectric properties
• dielectric properties

This work studied the effect of firing conditions on phase formation, microstructure and electrical properties of (Ba0.85Ca0.15)(Ti0.90Zr0.10)O-3;(abbreviated as BCTZ) ceramics, which were synthesized through the combustion technique. To reduce the reaction temperature, glycine was used as fuel with a ratio of raw material: glycine (1: 1.11). BCTZ samples were calcined at 900-1200 degrees C for 2 h and sintered at 1350 -1550 degrees C for 2 h. Ultrafine BCTZ powder and single peroveskite phase were achieved from the sample calcined at 1050 degrees C for 2 h. These results were obtained at a lower temperature and with shorter dwell time than those obtained using the solid state reaction method by similar to 150 degrees C and 1 h, respectively. The BCTZ ceramics exhibited a coexistence of rhombohedral and orthorhombic phase in all samples. The average particle size and the average grain size increased from 172 to 295 nm and 0.82 to 2.57 mu m, respectively, when firing temperatures increased. The highest density (5.76 g/cm 3), highest dielectric constant (epsilon(r) congruent to 4485 and epsilon(max) congruent to 14897) and best ferroelectric properties (P-r congruent to 18.47 mu C/cm(2) and E-C congruent to 4.52 kV/cm) were obtained from the sample sintered at 1450 degrees C for 2 h.

• 出版日期2016-1-26