Microstructural and Electrical Properties of Sn-Modified BaTiO3 Lead-Free Ceramics by Two-Step Sintering Method. (1st March 2018)

• Record Type: Journal Article
• Authors: Kayaphan, Wichita; Bomlai, Pornsuda
• Other Names: Lee Joon-Hyung Academic Editor.
• Is Part Of: Advances in materials science and engineering. Volume 2018(2018)
• Publication Date: 2018-03-01
• Subjects: Materials science -- Periodicals; Materials science; Periodicals; 620.11
• DOI: 10.1155/2018/9048062
• Languages: English
• ISSNs: 1687-8434

Abstract

Abstract : Ba(Ti0.92 Sn0.08 )O3 lead-free ceramics were prepared using a two-step sintering (TSS) technique. Varying the first sintering temperature T 1 (1400 and 1500°C) and the dwell time t 1 (0, 15, and 30 min), we obtained dense ceramics which were then soaked at a constant temperature of 1000°C ( T 2 ) for 6 h ( t 2 ). The structural and electrical properties were investigated. XRD results indicated that all the ceramics showed a pure perovskite phase with tetragonal symmetry. Density and grain size increased with higher T 1 temperatures and increased t 1 dwell times. Enhanced electrical properties were achieved by sintering at the optimized T 1 sintering temperature and t 1 dwelling time. At the lower T 1 sintering temperature of 1400°C, the dielectric and piezoelectric properties and the Curie temperature of the ceramics were improved significantly by increasing t 1 dwell time. Further, increasing the sintering temperature T 1 to 1500°C, excellent properties were obtained at t 1 = 15 min which then deteriorated when t 1 was increased to 30 min. The electrical properties of the sample sintered under the T 1 / t 1 / T 2 / t 2 condition of "1500/15/1000/6" showed the best values. For this sample the piezoelectric coefficient ( d 33 ), dielectric permittivity ( ε r ), loss factor (tan δ ), and Curie temperature ( T C ) were 490 pC/N, 4385, 0.0272, and 48°C, respectively.