title   
  

Swift heavy ion induced modifications in nano-crystalline microwave dielectric BaTi4O9 ceramics

Qureshi, Anjum and Mergen, Ayhan and Singh, N. L. (2010) Swift heavy ion induced modifications in nano-crystalline microwave dielectric BaTi4O9 ceramics. Journal of Alloys and Compounds, 504 (2). pp. 407-412. ISSN 0925-8388

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Official URL: http://dx.doi.org/10.1016/j.jallcom.2010.05.130

Abstract

The pellets of BaTi4O9 were synthesized via a polymerized complex method and irradiated with 50 MeV Li3+ ions for two different fluences. The dielectric constant (epsilon(r)), and dielectric loss (tan delta) as a function of frequency (1 kHz-2 MHz) and temperature (40-200 degrees C) were measured for unirradiated and irradiated samples. The values of epsilon(r) for unirradiated and irradiated samples decreased with frequency at room temperature which is explained by Koops' model. The increase in dielectric constant after the irradiation shows that the damage occurs during irradiation and produces defects due to electronic processes and/or inelastic collisions. Micro-structural properties revealed that the size of pores/holes and their number increased with irradiation fluence giving rise to volume expansion porous defects.

Item Type:Article
Uncontrolled Keywords:Ion irradiation; BaTi4O9; Citrate-gel processing; Dielectric properties
Subjects:Q Science > QD Chemistry > QD450-801 Physical and theoretical chemistry
T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
T Technology > TN Mining engineering. Metallurgy > TN600-799 Metallurgy
ID Code:14327
Deposited By:Anjum Qureshi
Deposited On:07 Sep 2010 12:33
Last Modified:25 May 2011 14:17

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