The mechanical and electrical properties of modified-BNKT lead-free ceramics

ABSTRACT

This research was conducted to study influence of ferric oxide nanoparticles on the properties of modified BNKT ceramics. The optimum sintering temperature was 1125°C at which all compositions had low porosity (0.12–0.19%). Raman and XRD showed coexisting rhombohedral and tetragonal phases throughout the entire compositional range. The P_r, d₃₃ and g₃₃ were slightly degraded when the additive was added. The maximum room temperature dielectric (ϵ′ = 1689, tan δ = 0.0606) and mechanical properties (HV = 5.6 GPa, HK = 4.9 GPa, E = 93 GPa and K_IC = 1.58 MPa.m^1/2) was obtained for the 2 vol% sample.

KEYWORDS:

• Lead-free piezoelectric ceramics
• mechanical
• electrical properties

Additional information

Funding

This work was supported by The Thailand Research Fund (TRF, BRG 6080002 and IRG5780013), National Research University (NRU) Project under Thailand's Office of the Higher Education Commission, Materials Science Research Center, Chiang Mai University. Department of Physics and Materials Science, Faculty of Science, Graduate School, Science and Technology Research Institute, Chiang Mai University, Thailand is also acknowledged.