Structure and Dielectric Behavior of MnxZn1-xTiO3, (x = 0.1, 0.3, & 0.5) Ceramics for Microwave Applications with Enhanced Permittivity.

Authors

  • J. Vijay Kumar Dept. of H&S (Physics), SKU College of Engg. & Tech., S.K. University, Anantapur, A.P.-515003, India
  • L. Obulapathi Dept. of H & S (Physics), Annamacharya University, Rajampet, A.P.-516126, India
  • G.Venkata Ramana Dept. of Physics, SCNR Govt. Degree College, Proddatur-516360, YSR Kadapa Dist., A.P, India
  • G. Prathibha Dept. of Physics, CMR College of Engineering & Technology(A), Kandlakoya, Hyderabad-501401, T.S., India
  • P. Rosaiah Dept. of Physics, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Thandalam, Chennai-602 105, India.
  • P. Siva Kumar Dept. of Physics, Kaveri University, Gowraram-502279, T.S., India.
  • K. Vagdevi Department of Physics, School of Engineering & Technology, Kaveri University, Gowraram, Siddipet-502279, Telangana, India
  • A. Guru Sampath Kumar Department of Physics, School of Engineering & Technology, Kaveri University, Gowraram, Siddipet-502279, Telangana, India
  • U. Mahesh Kumar Dept. of H&S (Physics), Srinivasa Ramanujan Institute of Technology (A), Anantapur, A.P.-515701, India
  • J.V.V.N. Kesava Rao Dept. of Physics, P.S. Govt. Degree College, Penukonda-515110, Sri Satya Sai Dist., A.P., India

Abstract

Europium-doped fluorapatite Ca10-x(PO4)6F2:xEu3+ (x = 0.05, 0.1 and 0.5) nanoparticles were successfully synthesised by a coprecipitation method at room temperature and calcination at 700 ⁰C. Characterisation of samples using XRD, TEM, TGA-DTA, FTIR and photoluminescence spectroscopy showed that the obtained calcium deficient fluorapatite nanoparticles exhibit a high degree of crystalline disorder, i.e. Eu doping leads to a remarkable structural amorphisation of fluorapatite. The crystallinity and crystallite size of the obtained samples decreased with the increase of Eu doping. The lattice parameters of the calcined samples decrease noticeably with the increase in Eu3+ dopant concentration. When excited by UV radiation at 393 nm, all europium-doped fluorapatite samples showed the characteristic 5D0–7F0–4 emission lines of Eu3+ ions. According to the luminescence results, the Eu3+ ions have largely replaced the Ca2+ ions in the Ca(I) position in the crystal lattice of the fluorapatite

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Published

2026-09-12

Issue

Vol. 58 No. 3 (2026)

Section

Articles

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