Details

Autor(en) / Beteiligte

• Manotham, Supalak
• Butnoi, Pichitchai
• Rujijanagul, Gobwute

Titel

Electrical and mechanical properties of bismuth sodium potassium titanate doped with a modified barium titanate lead-free ceramics

Ist Teil von

• Ferroelectrics, 2019-11, Vol.552 (1), p.23-31

Ort / Verlag

Philadelphia: Taylor & Francis

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Taylor & Francis

Beschreibungen/Notizen

• Piezoelectric ceramics of bismuth sodium potassium titanate doped with a modified barium titanate (BNKT-xBTNb, x = 0.00-0.06) were prepared via the solid-state reaction process. The effect of BTNb on the phase formation, mechanical, dielectric, ferroelectric, and piezoelectric properties was investigated and discussed. All ceramics have a single perovskite phase. The data also revealed that there was a transformation from rhombohedral (x = 0.00) to mixed tetragonal/rhombohedral phases (0.02 ≤ x ≤ 0.04.), then to tetragonal-rich phases at x = 0.06. Microstructure analysis also indicated that the BTNb affected the morphology of the microstructure, where the average grain size decreased with increasing BTNb content. The BTNb doping produced an enhancement of mechanical properties, HV and HK increased with increasing BTNb content and reached the maximum values of 6.28 GPa, 5.51 GPa for x = 0.04 sample, respectively. The improvement of the properties was related to the change in microstructure. Furthermore, dielectric enhanced with increasing BTNb content, which reached a maximum value of 5439 for the x = 0.06 sample. However, the BTNb doping produced slimmer P-E loops which decreasing of P r and E c values. Meanwhile, the undoped BNKT displayed a highest piezoelectric coefficient, d 33 of 198 pC/N.