 |
 |
 |
|
|
|
|
Dr. Ang Chen's Lab
Ferroelectric/Piezoelectric Properties under strong dc electric-field
Dielectric response in polar dielectrics with respect to external temperature, frequency, electric field, and pressure is an important issue in dielectric/ferroelectric physics. In the literature, the dielectric spectra as a function of frequency or temperature have been extensively studied both experimentally and theoretically. However, the dielectric response as a function of electric-field, especially up to high field levels has been studied less.
In fact, the electric-field dependence of the dielectric response can provide very useful information on the basic physics of dielectric polarization. In some cases, such information is critical in understanding the dielectric/ferroelectric behavior in polar dielectrics. In addition, a new type of electronic device making use of the variation of the dielectric constant of polar dielectrics under dc bias have been recently developed for allocations in the next generation radar and microwave communication systems. Therefore, a study of the dielectric nonlinear behavior under dc bias is also technologically important.
Other papers related this topic are also shown below.
CHEN Ang and ZHI Yu, DC electric-field dependence of the dielectric constant in polar dielectrics: “multi-polarization-mechanism” model, Physical Review B69, 174109 (2004) (8 pages).
CHEN Ang and ZHI Yu, Dielectric behavior of PbZr0.52Ti0.48O3 thin films: intrinsic and extrinsic dielectric response, Applied Physics Letters, 85[17], 3821-23 (2004).
CHEN Ang and ZHI Yu, Phase transition temperature and character of Cd2Nb2O7, Physics Review B70, 134103 (2004) (4 pages).
ZHI Yu, CHEN Ang, Ruyan Guo, and A.S. Bhalla, Dielectric properties and high tunability of Ba(Ti0.7Zr0.3)O3 ceramics under dc bias, Applied Physics Letters, 81[7], 1285-87 (2002).
CHEN Ang, A. S. Bhalla, and L. E. Cross, Dielectric behavior of paraelectric KTaO3, CaTiO3 and (Ln1/2Na1/2)TiO3 under dc electric-field, Physical Review B64, 18 4104 (2001) (6 pages).
CHEN Ang, ZHI Yu, L. E. Cross, Ruyan Guo, and A. S. Bhalla, Dielectric relaxation and conduction in SrTiO3 thin films under dc bias, Applied Physics Letters, 79[6], 818-20 (2001).
CHEN Ang, L.E. Cross, ZHI Yu, Ruyan Guo, and A.S. Bhalla, Dielectric loss and defect mode of SrTiO3 thin film under direct-current bias, Applied Physics Letters, 78[18], 2754-56 (2001).
CHEN Ang, A.S. Bhalla, Ruyan Guo, and L.E. Cross, Effect of dc bias on dielectric properties of Cd2Nb2O7 ceramics, Journal of Applied Physics, 90[5], 2465-68 (2001).
CHEN Ang, A.S. Bhalla, Ruyan Guo, and L.E. Cross, Dielectric loss of SrTiO3 single crystal under direct current bias, Applied Physics Letters, 76[14], 1929-1931(2000).
CHEN Ang, L.E. Cross, Ruyan Guo, and A.S. Bhalla, Clusters polarization in Cd2Nb2O7 compound, Applied Physics Letters, 77[5], 732-734(2000).
CHEN Ang, Ruyan Guo, A.S. Bhalla, and L. E. Cross, Dielectric Behavior and High Tunability in Cd2Nb2O7, Integrated Ferroelectrics, 42, 419-431 (2002).