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

Qureshi A., Mergen A., Singh N. L.

JOURNAL OF ALLOYS AND COMPOUNDS, cilt.504, sa.2, ss.407-412, 2010 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 504 Sayı: 2
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.jallcom.2010.05.130
  • Dergi Adı: JOURNAL OF ALLOYS AND COMPOUNDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.407-412
  • Anahtar Kelimeler: Ion irradiation, BaTi4O9, Citrate-gel processing, Dielectric properties, BARIUM-TITANATE, POLYMERIC PRECURSOR, IRRADIATION, TEMPERATURE, OXIDES
  • Marmara Üniversitesi Adresli: Evet

Özet

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. (C) 2010 Elsevier B.V. All rights reserved.