 |
 |
 |
|
|
|
|
Dr. Ang Chen's Lab
Dielectric Relaxor Behavior
A terminology “Dielectric Relaxor” was introduced to describe a type of dielectric relaxation process, which displays the following characteristics:
(1) The dielectric relaxation behavior follows the Cole – Cole equation.
(2) Relaxation rates follow the Arrhenius law.
(3) The permittivity maximum temperature (Tm) is independent of doping concentration.
(4) Tm is also independent of dc electric fields.The terminology “Dielectric Relaxor” was for first time introduced by CHEN Ang and ZHI Yu to describe the dielectric relaxation behavior observed in Bi doped SrTiO3, see, CHEN Ang and ZHI Yu, Dielectric relaxor and ferroelectric relaxor: doped paraelectric SrTiO3, Journal of Applied Physics, 91[3], 1487-94 (2002). This behavior has been also found in a series of polar-dielectrics, such as, polymers and other ferroelectrics.
Other papers related this topic are also shown below.
ZHI Yu, and CHEN Ang, Dielectric relaxor behavior of Cd2Nb2O7, Applied Physics Letters, 85[5], 801-3 (2004).
ZHI Yu, and CHEN Ang, Dielectric behavior of electroactive fluorinate-based polymers under dc bias, Applied Physics Letters, 85[17], 3827-29 (2004).
CHEN Ang, J. F. Scott, ZHI Yu, H. Ledbetter, and J.L. Baptista, Dielectric and Ultrasonic Anomalies at 22K, 37K and 65K in SrTiO3, Physical Review B59, 6661-64(1999).
CHEN Ang, ZHI Yu, J. Hemberger, P. Lunkhemer, and A. Loidl, Dielectric anomalies in bismuth doped SrTiO3; Defect modes at low impurity concentrations, Physical Review B59, 6665-69(1999).
ZHI Yu, CHEN Ang, Ruyan Guo, Amar S. Bhalla, and L. E. Cross, Oxygen vacancy related dielectric relaxation in (Sr1-1.5xBix)TiO3, Ferroelectrics, 262, 219-225 (2001).
CHEN Ang and ZHI Yu, Phonon-coupled impurity dielectric modes in Bi:SrTiO3, Physical Review B61, 11363-66(2000).
CHEN Ang, ZHI Yu, P. M. Vilarinho and J. L. Baptista, Bi:SrTiO3: A quantum ferroelectric and a relaxor, Physical Review B57, 7403-06(1998).