ISSN(Online) : 2319-8753 ISSN (Print) : 2347-6710 International Journal of Innovative Research in Science, Engineering and Technology (An ISO 3297: 2007 Certified Organization) Vol. 5, Issue 11, November 2016 Copyright to IJIRSET DOI:10.15680/IJIRSET.2016.0511022 18967 Photo Dielectric Effect Study in the Composite of Magnesium Titanate and Zinc Oxide Dr. Sumit Ruhela 1 , Dr. S.K. Srivastava 2 , Manav Srivastava 3 Assistant Professor, Dept. of Applied Sciences, J.P. Institute of Engg. & Technology, Meerut, India 1 Professor, Dept. of Applied Sciences, Dronacharya College of Engg. & Technology, Gr. Noida, India 2 B. Tech student, Dept. of Electrical & Electronics, Dronacharya College of Engg. & Technology, Gr. Noida, India 3 ABSTRACT: An attempt is made to study photo dielectric effect in the composite of magnesium titanate and zinc oxide with different ratio. The mixed composite of magnesium titanate and zinc oxide is prepared by heat treatment method. The sample is prepared by firing the mixture (magnesium titanate and zinc oxide) at temperature 600 0 C – 900 0 C in a cylindrical furnace for 40- 55 minute. The sensitive material is sandwiched in between the parallel plate capacitor. The measurements are carried out in temperature range 30 0 C - 95 0 C in the frequency range (100 Hz -50000 Hz) with illumination intensity up to 5000 lux. The variation of conductance (G), capacitance (C) and loss factor (tan) is observed with illumination intensity. KEYWORDS: MgTiO 3 , ZnO, PDE, Loss factor, Conductance, Capacitance. I. INTRODUCTION Photo dielectric effect is essentially another manifestation of photoconductivity. This was investigated by the Kallman[11,12] result of measurement on CdS, has shown that the decay of the photo induced capacity is change rapidly, even though the presence of deep trap can be demonstrated through measurement of the rise of photoconductivity. Garlick& Gibson propounded the hypotheses that the photoelectric effect is associated with trapped electrons. In electrets made from polar materials the disorientation of dipoles plays a prominent role. This disorientation tends to destroy the persistent dipole polarization by redistribution of all the dipoles at random. The disorientation of dipoles involves the rotation of coupled pair of positive or negative charges and requires certain activation energy per dipole [12]. The space charge is formed nearby electrode, around the boundaries and both in the volume and at the surface of the bulk. The capacitance increases with increasing intensity of illumination. The space charge formed is observed only in the lower frequency region. The variation of the ac conductance with frequency may be due to the variation in the formation of space charge. Many other investigations have been carried out by Kronenberg and Accardo[13] on different material. Their measurement indicated that some material showed photo dielectric effect, which might well be associated simply with photoconductivity [10]. When certain photo conducting material are placed as a dielectric in sandwiched type cell in presence of alternating field ,the radiation absorbed by the photoconductor increases the capacitance and dielectric loss. This phenomenon is known as photo dielectric effect (PDE).