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HomeKey Engineering MaterialsKey Engineering Materials Vol. 726Domain Walls and Thermal Aging Stability of...

Domain Walls and Thermal Aging Stability of (K,Na)NbO₃-Based Ceramics in Tetragonal Phase

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Abstract:

Thermal depoling behaviors of (K_0.50Na_0.50)_0.94Li_0.06NbO₃ and (K_0.50Na_0.50)_0.96Li_0.04(Nb_0.85Ta_0.15)O₃ ceramics possessing tetragonal crystalline structure at room temperature have been studied. By comparing the difference in these two compositions during annealing treatment, we provide visual evidence that different types of ferroelectric domain walls play different roles in the thermal depoling. The study results show that the drop in piezoelectric properties can be mainly attributed to the motion of 180^o domain walls below the Curie temperature. When the thermal aging temperature is close to the Curie temperature, the reduction of piezoelectric properties is caused by the movement of 90^o domain walls. The (K_0.50Na_0.50)_0.96Li_0.04(Nb_0.85Ta_0.15)O₃ ceramic with fewer 180^o domains shows very good thermal ageing stability from the low experimental temperature limit of −60 °C up to high temperatures close to T_C.

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Periodical:

Key Engineering Materials (Volume 726)

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225-229

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.726.225

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Online since:

January 2017

Authors:

Yong Gao*, Hong Yi Zhao, Fu Tian Liu, Xiao Bo Zhao, Kong Zan Zhu, Nan Jing Song

Keywords:

Domain Walls, Piezoelectric Ceramics, Thermal Aging Stability

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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