Ang Chen


Ang Chen

Title: Associate Professor
Department: Physics
Office: Ayer 229
Phone: (330)-972-6657
Fax: (330)-972-6918
Email: ang(at)uakron.edu
Website: http://nebula.physics.uakron.edu/dept/faculty/angchen/index.htm


Biography

  • Faculty Member, Department of Physics, The University of Akron, Akron, Ohio, USA. 7/2002 - present

  • Researcher, Materials Research Laboratory, The Pennsylvania State University, PA, USA. 10/1998 – 6/2002
  • Guest Physicist, Institut für Physik, Universität Augsburg, Germany. 12/1997 - 9/1998
  • Faculty Member, Department of Physics, Zhejiang University, China. 1/1989 - 11/1997 (During 10/1994 - 11/1997, carrying out the cooperative research and teaching in both of Zhejiang University and University of Aveiro, Portugal).
  • Doctor of Science, Physics, Zhejiang University, Hangzhou, China, 1994

Research Interests

 ( see Research WebPage for details )

  •      ·    Experimental Condensed Matter Physics

    • Understanding of the physical mechanisms of ferroelectric/dielectric/ piezoelectric and transportation behavior in electronic ceramics, single crystals and polymers, as well as composite materials.  

    • Characterization of ferroelectric / dielectric / piezoelectric and transportation behavior of ceramics, single crystals, thin films, and functional polymers in wide temperature range (1.5 K - 1000 K) and frequency range (10^-3 Hz - 10^9 Hz), and with and without dc electric-field  

         ·    Theory and Modeling

         ·    Materials Science and Electronic Devices

    • Processing of electronic materials (ceramics, single crystals, and thin films)

    • Ferroelectric, piezoelectric, dielectric and electrostrictive ceramics, single crystals, thin films, polymers, and composite materials, as well as their applications as devices (capacitors, transformers, and actuators, etc.)

    • Conducting/Superconducting ceramics/thin-films

    • Microwave ceramics

    • Photonic single crystals & devices

Selected Publications

CHEN Ang and ZHI Yu, Dielectric behavior and “core-shell” microstructure in (Sr,Bi,Na)TiO3  solid solutions, Journal of Applied Physics, accepted, tentatively scheduled to be published in, 107[10],  May, 2010.

CHEN Ang and ZHI Yu, High remnant polarization in (Sr0.7Bi0.2)TiO3 - (Na0.5Bi0.5)TiO3 solid solutions, Applied Physics Letters, 95, 232908 (2009).

CHEN Ang and ZHI Yu, High capacitance-temperature sensitivity and “giant” dielectric constant in SrTiO3, Applied Physics Letters, 90, 202903 (2007).

CHEN Ang and ZHI Yu, Effect of annealing on dielectric properties and electrical transportation of doped SrTiO3, Applied Physics Letters, 88, 162902 (2006).

CHEN Ang and ZHI Yu, High purely electrostrictive strain in lead-free dielectrics, Advanced Materials, 18, 103-106 (2006).

CHEN Ang and ZHI Yu, “Dielectric relaxor” behavior of electroactive fluorinated polymers, Applied Physics Letters, 86, 26-2903 (2005).

"Dielectric relaxation of fluorinate-based terpolymers",

CHEN Ang and ZHI Yu,  Applied Physics Letters, 84[12], 2145-7 (2004).

"Ferroelectric, Electroactive and dielectric relaxation behavior of fluoro-polymers",

CHEN Ang and ZHI Yu,  Advanced Materials, 16[12], 795-8 (2004). 

"DC electric-field dependence of the dielectric constant in polar dielectrics: multipolarization-mechanism model",

CHEN Ang and ZHI Yu,  Physics Review B, Vol. 69, 174109 (2004).

"Calculation of dielectric constant and loss of two-phase composites",

CHEN Ang, ZHI Yu, Ruyan Guo, and A. S. Bhalla, Journal of Applied Physics, 93[6], 3475-80 (2003).

 

"Dielectric properties of Bi2O3-ZnO-Ta2O5 pyrochlore and zirconolite structure ceramics",

CHEN Ang, ZHI Yu, H. J. Youn, C. A. Randall, A. S. Bhalla, L. E. Cross, J. Nino, and M. Lanagan, Applied Physics Letters, 82[21], 3734-6 (2003).

 

"Dielectric relaxor and ferroelectric relaxor: doped paraelectric SrTiO3",
CHEN Ang and ZHI Yu, Journal of Applied Physics, 91[3], 1487-94 (2002).

"Low temperature dielectric relaxation in pyrochlore (Bi3/4Zn1/4)2(Zn1/4Ta3/4)2O7 compounds",

CHEN Ang, ZHI Yu, H. J. Youn, C. A. Randall, A. S. Bhalla, L. E. Cross, J. Nino, and M. Lanagan, Applied Physics Letters, 80[25], 4807-09 (2002). Pdfreprint

"Piezoelectric and Electrostrictive strain behavior of Ce-doped BaTiO3 ceramics", 

CHEN Ang, ZHI Yu, ZHI Jing, Ruyan Guo, A.S. Bhalla, and L. E. Cross, Applied Physics Letters, 80[18], 3424-26 (2002). 

"Dielectric relaxation and conduction in SrTiO3 thin films under dc bias", 

CHEN Ang, ZHI Yu, L. E. Cross, Ruyan Guo, and A. S. Bhalla, Applied Physics Letters, 79[6], 818-20 (2001). 

"Dielectric loss and defect mode of SrTiO3 thin film under dc bias", 

CHEN Ang, L.E. Cross, ZHI Yu, Ruyan Guo, A.S. Bhalla, and Jianhua Hao, Applied Physics Letters, 78[18], 2754-56 (2001). 

"Effect of dc bias on dielectric properties of Cd2Nb2O7 ceramics", 

CHEN Ang, A.S. Bhalla, Ruyan Guo, and L.E. Cross, Journal of Applied Physics, 88[9], 2546-49 (2001). 

"Dielectric behavior of paraelectric KTaO3,CaTiO3and (Ln1/2Na1/2)TiO3under dc field", 

CHEN Ang , A. S. Bhalla, and L. E. Cross, Physical Review B64, [18], 4104 (2001).

"Oxygen-vacancies-related low-frequency dielectric relaxation and electrical conduction in Bi:SrTiO3", 

CHEN Ang, ZHI Yu, and L. E. Cross, Physical Review B62, 228-236(2000). 

"Phonon-coupled impurity dielectric modes in Bi:SrTiO3", 

CHEN Ang and ZHI Yu, Physical Review B61, 11363-66(2000). 

"Dielectric spectra and electrical conduction in Fe doped SrTiO3", 

CHEN Ang, ZHI Yu, ZHI Jing, P. Lunkenheimer and A. Loidl, Physical Review B61, 3922-26(2000). 

"Impurity induced ferroelectric relaxor behavior in quantum paraelectric SrTiO3 and ferroelectric BaTiO3", 

CHEN Ang, ZHI Yu, and ZHI Jing, Physical Review B61, 957-961(2000). 

"Dielectric loss of SrTiO3 single crystal under direct current bias", 

CHEN Ang, A.S. Bhalla, Ruyan Guo, and L.E. Cross, Applied Physics Letters, 76[14], 1929-1931(2000). 

"Clusters polarization in Cd2Nb2O7 under dc bias", 

CHEN Ang, L.E. Cross, Ruyan Guo, and A.S. Bhalla, Applied Physics Letters, 77[5], 732-734(2000). 

"Dielectric relaxation processes in Cd2Nb2O7 Compound", 

CHEN Ang, Ruyan Guo, A.S. Bhalla, and L.E. Cross, Journal of Applied Physics, 87[10], 7452-56(2000). 

"Effect of Electrical Field and Post-Treatment on Dielectric Behavior of SrTiO3", 

CHEN Ang, Ruyan Guo, A.S. Bhalla, and L.E. Cross, Journal of Applied Physics, 87[8], 3937-3940(2000). 

"Dielectric and Ultrasonic Anomalies at 22K, 37K and 65K in SrTiO3", 

CHEN Ang, J. F. Scott, ZHI Yu, H. Ledbetter, and J.L. Baptista, Physical Review B59, 6661-64(1999). 

"Dielectric anomalies in bismuth doped SrTiO3; Defect modes at low impurity concentrations",

CHEN Ang, ZHI Yu, J. Hemberger, P. Lunkhemer, and A. Loidl, Physical Review B59, 6665-69(1999). 

"Dielectric relaxation modes in bismuth doped SrTiO3; The Relaxor Behavior", 

CHEN Ang, ZHI Yu, P. Lunkhemer, J. Hemberger, and A. Loidl, Physical Review B59, 6670-74(1999). 

"Bi:SrTiO3: A quantum ferroelectric and a relaxor", 

CHEN Ang, ZHI Yu, P. M. Vilarinho and J. L. Baptista, Physical Review B57, 7403-06(1998). 

"A variable-range hopping conduction and dielectric relaxation in disordered Sr0.97(Ti1-xFex)O3 ",

CHEN Ang, J. R. Jurado, ZHI Yu, M.T. Colomer, J.R. Frade, and J.L. Baptista, Physical Review B57, 11858-61(1998).