Thermally-Driven Unequal Cation Vacancy Formation and Its Effect on the Dielectric Properties in K0.5Na0.5NbO3 Ceramics

다국어 초록 (Multilingual Abstract)

The formation of cation vacancies can be useful for electro-chemical devices. In this regard, an understanding of vacancy formation is an important subject for enhancing current electrochemical devices and for developing next generation energy devices. In this work, we chose the well-known lead-free ferroelectric (K0.5Na0.5)NbO3 (KNN) as a model system to understand both the formation of cation vacancies and the relationship between cation vacancies and the physical properties. We studied sintering-duration dependence of the dielectric properties and the cation contents of KNN ceramics at the temperatures near the melting point of KNN. The difference in sintering duration led to a drastic change in the dielectric property, as well as to the creation of cation vacancies.
Interestingly, we observed unequal evaporation of cations during the sintering process, which was confirmed by the data obtained from laser-induced breakdown spectroscopy. In addition, we found more drastic changes in the imaginary dielectric constant, which were likely due to a decrease in ionic conducting species, such as K and Na, in KNN.

참고문헌 (Reference)

1 M. Li, 92 : 115435-, 2015

2 Y-J. Dai, 94 : 042905-, 2009

3 N. Paunovi´c, 4 : 5469-, 2012

4 P. Chin Goh, 99 : 092902-, 2011

5 S. Dasgupta, 26 : 7507-, 2016

6 J. Shi, 5 : 4860-, 2014

7 H. Jeen, 12 : 1057-, 2013

8 K. A. Stoerzinger, 6 : 487-, 2015

9 J. R. Petrie, 26 : 1564-, 2016

10 J. Jeong, 339 : 1402-, 2013

11 J. F. Li, 96 : 3677-, 2013

12 L. Liu, 117 : 138-, 2009

13 B. Maliˇc, 8 : 8117-, 2015

14 R. Guo, 84 : 5423-, 2000

15 T. Furukawa, 50 : 4904-, 1979

16 W. Li, 8 : 126-, 2012

17 S. Huo, 95 : 1383-, 2012

18 H. E. Mgbemere, 32 : 4341-, 2012

19 E. Ringgaard, 25 : 2701-, 2005

20 T. R. Shrout, 19 : 113-, 2007

21 G. Ray, 142 : 619-, 2013

22 S. Zhang, 19 : 251-, 2007

23 Y-H. Lee, 47 : 4620-, 2008

24 P. Mahesh, 73 : 012-, 2015

25 R. Sumang, 41 : S136-, 2015

26 J. Acker, 93 : 1270-, 2010

27 K. Wang, 1 : 24-, 2012

28 Z-Y. Shen, 97 : 911-, 2009

29 Y. Zhen, 89 : 3669-, 2006

30 D. Jenko, 11 : 572-, 2005

31 D. Rusak, 27 : 257-, 1997

32 D. W. Hahn, 66 : 347-, 2012

33 N. Wei, 41 : 9555-, 2015

34 H. Rietveld, 2 : 65-, 1969

35 B. Orayech, 48 : 318-, 2015

36 K. Wang, 93 : 1101-, 2010

37 H. Du, 131 : 83-, 2006

38 J. G. Fisher, 29 : 2581-, 2009

39 C. Fabre, 66 : 1401-, 2002

40 T. Kim, 102 : 4284-, 1998

41 A. Popoviˇc, 5 : 76249-, 2015

42 A. B. Haugen, 35 : 1449-, 2015

43 B. Malic, 91 : 1916-, 2008

44 M. W. Chase, 4 : 1-, 1975

45 B. Jaffe, "Piezoelectric ceramics" Academic Press 185-, 1971

46 Yongjie Zhao, "Low-temperature sintering of KNN with excess alkaline elements and the study of its ferroelectric domain structure" 한국물리학회 13 (13): 2082-2086, 2013

47 S. Priya, "Lead-free piezoelectrics" Springer-Verlag 87-, 2011

48 R. L´opez-Ju´arez, "Ferroelectrics-Material Aspects" InTech 2011