Ashok Kumar
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Ashok Kumar has a total of 10 co-authors. Here are the top co-authors by number of shared publications:
- Shashank Priya
Department of Materials Science and Engineering Pennsylvania State University University Park Pennsylvania USA
2 shared publications - Amnah Eltahir
Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA
1 shared publication - Deepam Maurya
Bio-inspired Materials and Devices Laboratory (BMDL), Center for Energy Harvesting Materials and Systems (CEHMS), Virginia Tech, 24061 USA
1 shared publication - Giti A. Khodaparast
Department of Physics, Virginia Tech, Blacksburg, USA
1 shared publication - Hsin Wang
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
1 shared publication - James R. Heflin
Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA
1 shared publication
Latest Publications
- 1 March 2018
- Published by Walter de Gruyter GmbH
Opto-electrical Behavior of Pb(Zn1/3Nb2/3)O3–Pb0.97La0.03(Zr,Ti)O3 Transparent Ceramics with Varying Defect Structure
We report correlation between the electro-mechanical, ferroelectric, optical and opto-electric behavior in Pb(Zn1/3Nb2/3)O3–Pb0.97La0.03(Zr,Ti)O3 transparent ceramics. Optical interaction during current–voltage (I–V) measurements enhanced the current output and revealed its strong dependence on wavelength and power of the impinging radiation. Piezoresponse force microscopy revealed that the improved characteristics at low stoichiometric excess of various elements were related to nano-sized stripe domains. Raman analysis indicated the presence of short-range clusters with rhombohedral–tetragonal phase distributed at much above the Curie temperature. The results reveal the potential of these ceramics in wireless opto-electric devices operating over a wide-range of wavelengths and temperatures. These classes of ceramics have successfully demonstrated in literature for use in pyroelectric generators and UV light energy harvesting, piezoelectric transformers.
- 1 March 2018
- Published by Walter de Gruyter GmbH
Opto-electrical Behavior of Pb(Zn1/3Nb2/3)O3–Pb0.97La0.03(Zr,Ti)O3 Transparent Ceramics with Varying Defect Structure
We report correlation between the electro-mechanical, ferroelectric, optical and opto-electric behavior in Pb(Zn1/3Nb2/3)O3–Pb0.97La0.03(Zr,Ti)O3 transparent ceramics. Optical interaction during current–voltage (I–V) measurements enhanced the current output and revealed its strong dependence on wavelength and power of the impinging radiation. Piezoresponse force microscopy revealed that the improved characteristics at low stoichiometric excess of various elements were related to nano-sized stripe domains. Raman analysis indicated the presence of short-range clusters with rhombohedral–tetragonal phase distributed at much above the Curie temperature. The results reveal the potential of these ceramics in wireless opto-electric devices operating over a wide-range of wavelengths and temperatures. These classes of ceramics have successfully demonstrated in literature for use in pyroelectric generators and UV light energy harvesting, piezoelectric transformers.