Details

Autor(en) / Beteiligte

• Li, Ming‐Ding
• Tang, Xin‐Gui
• Zeng, Si‐Ming
• Liu, Qiu‐Xiang
• Jiang, Yan‐Ping
• Zhang, Tian‐Fu
• Li, Wen‐Hua

Titel

Phase structure analysis and pyroelectric energy harvesting performance of Ba(HfxTi1‐x)O3 ceramics

Ist Teil von

• Journal of the American Ceramic Society, 2019-06, Vol.102 (6), p.3623-3629

Ort / Verlag

Columbus: Wiley Subscription Services, Inc

Erscheinungsjahr

2019

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• Ba(Ti1‐xHfx)O3 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(Ti1‐xHfx)O3 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 ND = 491.30 kJ/m3 (ΔT = 120°C, EH = 50 kV/cm) was achieved in the Ba(Hf0.05Ti0.95)O3 ceramic. Compared with those of BT, the values of ND more than doubled in the temperature range from ΔT = 60°C to ΔT = 100°C in the Ba(Hf0.05Ti0.95)O3 ceramic and even increased 3.2 times at ΔT = 80°C near the Curie temperature (TC) of the Ba(Hf0.05Ti0.95)O3 sample. In addition, a larger pyroelectric energy harvesting density value of ND = 367.10 kJ/m3 (ΔT = 120°C, EH = 50 kV/cm) was acquired in the Ba(Hf0.12Ti0.88)O3 ceramic. Values of ND‐BHT5/ND‐BT and ND‐BHT12/ND‐BT were analyzed in the Ba(Ti1‐xHfx)O3 ceramics. The optimal pyroelectric properties can be obtained in the vicinity of the ferroelectric to paraelectric phase‐transition region. The phase structure design of Ba(HfxTi1‐x)O3 ceramics to achieve large pyroelectric energy harvesting performance (ND = 491.30 kJ/cm3 at ΔT = 120 °C, EH = 50 kV/cm) at near TC was reported for the first time.