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    • Keywords


      Resonators; complex perovskites; X-ray diffraction; dielectric properties; high $Q$.

    • Abstract


      The effect of Ba(Mg$_{1/8}$Nb$_{3/4}$)O$_3$ phase on structure and dielectric properties of Ba(Mg$_{1/3}$Nb$_{2/3})O$_3$ was studied by synthesizing $(1−x)$Ba(Mg$_{1/3}$Nb$_{2/3}$)O$_{3}$−$x$Ba(Mg$_{1/8}$Nb$_{3/4}$)O$_3$ ($x = 0,$ 0.005, 0.01 and 0.02) ceramics. Superlattice reflections due to 1:2 ordering appear as low as 1000$^{\circ}$C. Ba(Mg$_{1/3}$Nb$_2/3}$)O$_3$ forms solid solution with Ba(Mg$_{1/8}$Nb$_{3/4}$)O$_3$for all ‘$$x’ values studied until 1350$^{\circ}$C. Ordering as confirmed by powder X-ray diffraction pattern, Raman study andHRTEM. Ceramic pucks can be sintered to density $>$92% of theoretical density. Temperature and frequency-stable dielectricconstant and nearly zero dielectric loss ($\tan \delta$) were observed at low frequencies (20 MHz). The sintered samples exhibit dielectric constant ($\epsilon_\tau$) between 30 and 32, high quality factor between 37000 and 74000 GHz and temperature coefficient of resonant frequency ($\tau_f$ ) between 21 and 24 ppm$^{\circ}$C$^{−1}$.

    • Author Affiliations



      1. Department of Chemistry, University of Delhi, Delhi 110007, India
      2. Materials Science and Technology Division, National Institute for Interdisciplinary Science and Technology (NIIST-CSIR), Industrial Estate, Trivandrum 695019, India
    • Dates

  • Bulletin of Materials Science | News

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      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

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