Phase structure analysis and pyroelectric energy harvesting performance of Ba(Hf x Ti 1 ‐x )O 3 ceramics

• Published in: Journal of the American Ceramic Society Vol. 102; no. 6; pp. 3623 - 3629
• Main Authors: Li, Ming‐Ding, Tang, Xin‐Gui, Zeng, Si‐Ming, Liu, Qiu‐Xiang, Jiang, Yan‐Ping, Zhang, Tian‐Fu, Li, Wen‐Hua
• Format: Journal Article
• Language: English
• Published: 01.06.2019
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/jace.16237

Ba(Ti 1‐ x H f x )O 3 ceramics were synthesized by a solid‐state reaction process. The evolution of the phase structure was identified by XRD spectrum, dielectric spectroscopy, and temperature‐dependent Raman spectroscopy for the Ba(Ti 1‐ x H f x )O 3 ceramics. In addition, pyroelectric energy harvesting properties based on the Olsen cycle were investigated for the first time. A maximum pyroelectric energy harvesting density value of N D   = 491.30 kJ /m 3 (Δ T  = 120°C, E H   = 50 kV /cm) was achieved in the Ba(Hf 0.05 Ti 0.95 )O 3 ceramic. Compared with those of BT , the values of N D more than doubled in the temperature range from Δ T  = 60°C to Δ T  = 100°C in the Ba(Hf 0.05 Ti 0.95 )O 3 ceramic and even increased 3.2 times at Δ T  = 80°C near the Curie temperature ( T C ) of the Ba(Hf 0.05 Ti 0.95 )O 3 sample. In addition, a larger pyroelectric energy harvesting density value of N D   = 367.10 kJ /m 3 (Δ T  = 120°C, E H   = 50 kV /cm) was acquired in the Ba(Hf 0.12 Ti 0.88 )O 3 ceramic. Values of N D ‐ BHT 5 / N D ‐ BT and N D ‐ BHT 12 / N D ‐ BT were analyzed in the Ba(Ti 1‐ x H f x )O 3 ceramics. The optimal pyroelectric properties can be obtained in the vicinity of the ferroelectric to paraelectric phase‐transition region.