Piezoelectric and Ferroelectric Properties of KNbO3 Added Bi0.5Na0.5TiO3 Ceramics

Puripat Kantha; Phathaitep Raksa; Muangjai Unruan; Tawee Tunkasiri; Panupong Jaiban; Nuttapon Pisitpipathsin

doi:10.4028/www.scientific.net/KEM.751.384

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 751Piezoelectric and Ferroelectric Properties of...

Piezoelectric and Ferroelectric Properties of KNbO₃ Added Bi_0.5Na_0.5TiO₃ Ceramics

Abstract:

The fabrication of lead-free (1-x)Bi_0.5Na_0.5TiO₃ - xKNbO₃ or (1-x)BNT-xKN ceramics where x = 0.00, 0.05, 0.10, and 0.15 was carried out by the modified two-step mixed oxide method. The effects of KNbO₃ on structure, piezoelectric and ferroelectric properties were systematically investigated. XRD results revealed that the (1-x)BNT-xKN ceramics with low KN content of x less than 0.05 contained ferroelectric phase with a rhombohedral symmetry while the ceramics with x = 0.05 possessed pseudocubic structure. The higher KN content (x ≥ 0.10) ceramics had symmetries rhombohedral structure. At room temperature, the highest P_r and low E_c were obtained when the composition of x = 0.05. Moreover, the results showed the moderate KN addition could enhance the piezoelectric response. The d₃₃ of 0.95BNT-0.05KN reached as high as 125 pC/N.

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Key Engineering Materials (Volume 751)

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384-389

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.751.384

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Online since:

August 2017

Authors:

Puripat Kantha, Phathaitep Raksa, Muangjai Unruan, Tawee Tunkasiri, Panupong Jaiban, Nuttapon Pisitpipathsin*

Keywords:

BNT-KN, Ferroelectric Properties, Lead-Free Piezoelectric Ceramics

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