Effects of sintering temperature on physical properties of (K0.5Na0.5)NbO3 ceramics
Vol. 129 No. 1A (2020), Hue University Journal of Science: Natural Science
Vol. 129 No. 1A (2020)

Effects of sintering temperature on physical properties of (K0.5Na0.5)NbO3 ceramics

Hue University Journal of Science: Natural Science
https://doi.org/10.26459/hueuni-jns.v129i1A.5663
Published 2020-03-20
Dung Thi Hoai Trang
Physics Department, University of Sciences, Hue University, 77 Nguyen Hue St., Hue, Vietnam
Hoang Ngoc An
Physics Department, University of Sciences, Hue University, 77 Nguyen Hue St., Hue, Vietnam
Le Thi Lien Huong
Physics Department, University of Sciences, Hue University, 77 Nguyen Hue St., Hue, Vietnam
Le Tran Uyen Tu
Physics Department, University of Sciences, Hue University, 77 Nguyen Hue St., Hue, Vietnam
Vo Thanh Tung
Physics Department, University of Sciences, Hue University, 77 Nguyen Hue St., Hue, Vietnam
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Keywords

lead-free ceramics
KNN
sintering temperature gốm không chì
KNN
nhiệt độ thiêu kết

How to Cite

1.
Hoài Trang DT, An HN, Liên Hương LT, Tú LTU, Tùng VT. Effects of sintering temperature on physical properties of (K0.5Na0.5)NbO3 ceramics. hueuni-jns [Internet]. 2020Mar.20 [cited 2024Nov.14];129(1A):125-30. Available from: http://222.255.146.83/index.php/hujos-ns/article/view/5663
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Abstract

This paper reports the synthesis of K0.5Na0.5NbO3 (KNN) ceramics by using an improved conventional method. The influence of sintering temperatures of the fabricated ceramics on the piezoelectric and dielectric properties was studied. It was found that density increases greatly within a narrow temperature range, and reaches the highest value of 4.2 g/cm3 at 1090 °C, corresponding to a dense microstructure with the tetragonal grain shape. However, when sintering temperature slightly exceeds the optimal one, the density tends to decrease, accompanied by the appearance of abnormal grain growth, which is considered to be due to the intensified volatilization of alkali metal oxides. At a sintering temperature of 1090 °C, the highest values of electromechanical coupling factor (kp) and the piezoelectric coefficient (d33) of the ceramics being 0.22 and 61 pC/N, respectively, may be related to homogenous grains size of orthorhombic phase.

https://doi.org/10.26459/hueuni-jns.v129i1A.5663
PDF (Vietnamese)

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