[1] Park S E and Shrout T R 1997 J. Appl. Phys. 82
1804

[2] Zhang S, Randall C A and Shrout T R 2003 Appl. Phys.
Lett. 83 3150

[3] Noheda B, Cox D E, Shirane G, Gonzalo J A, Cross L E and
Park S E 1999 Appl. Phys. Lett. 74 2059

[4] Noheda B, Gonzalo J A, Cross L E, Guo R, Park S E, Cox D E
and Shirane G 2000 Phys. Rev. B 61 8687

[5] Guo R, Cross L E, Park S E, Noheda B, Cox D E and Shirane
G 2000 Phys. Rev. Lett. 84 5423

[6] Saito Y, Takao H, Tani T, Nonoyama T, Takatori K, Homma T,
Nagaya T and Nakamura M 2004 Nature 432 84

[7] Cross E 2004 Nature 432 24

[8] Guo Y, Kakimoto K I and Ohsato H 2004 Appl. Phys.
Lett. 85 4121

[9] de Araujo C A P, Cuchiaro J D, McMillan L D, Scott M C and
Scott J F 1995 Nature 374 627

[10] Park B H, Kang B S, Bu S D, Noh T W, Lee J and Jo W 1999
Nature 401 682

[11] Wang C M and Wang J F 2007 Scripta Mater. 57
789

[12] Wang C M and Wang J F 2006 Appl. Phys. Lett.
89 202905

[13] Yan H, Li C G, Zhou J G, Zhu W M, He L X and Song Y X
2000 Jpn. J. Appl. Phys. 39 6339

[14] Yan H, Zhang H, Reece M J and Dong X 2005 Appl.
Phys. Lett. 87 082911

[15] Turner R C, Fuierer P A, Newnham R E and Shrout T R 1994
Appl. Acoust. 41 299

[16] Liu J, Shen Z, Yan H, Reece M J, Kan Y and Wang P 2007
J. Appl. Phys. 102 104107

[17] Zhou Z, Dong X, Chen H and Yan H 2006 J. Am. Ceram.
Soc. 89 1756

[18] Zhang Z, Yan H, Xiang P, Dong X and Wang Y 2004 J.
Am. Ceram. Soc. 87 602

[19] Wang C M, Wang J F, Gai Z G and Zhao M L 2008 Mater.
Chem. Phys. 110 402

[20] Wang C M and Wang J F 2008 J. Am. Ceram. Soc.
91 918

[21] Miyayama M and Noguchi Y 2005 J. Eur. Ceram. Soc.
25 2477