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Journal of Materials Science

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16-03-2021 | Electronic materials

Synthesis and characterization of temperature stable low-loss (1−x)Mg(Ti_0.95Sn_0.05)O₃–(x)BaTiO₃ (0 ≤ x ≤ 0.1) ceramics for microwave applications

Authors: Jasdeep Singh, Shalini Bahel

Published in: Journal of Materials Science | Issue 18/2021

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Abstract

In the present work, we prepared (1−x)Mg(Ti_0.95Sn_0.05)O₃–(x)BaTiO₃ (0 ≤ x ≤ 0.1) solid-solutions via traditional solid-state reaction process and investigated their structural, optical, electrical, dielectric, and shielding properties. We report that these (1−x)Mg(Ti_0.95Sn_0.05)O₃–(x)BaTiO₃ compounds experienced structural phase transitions, wherein the tetragonal-structured BaTiO₃ (space group P4mm) got transformed to monoclinic-structured Ba₄Ti₁₁O₂₆ (space group C12/m1), and triclinic-structured Ba₂Ti₉O₂₀ (space group P1). Interestingly, the Mg(Ti_0.95Sn_0.05)O₃ showed no structural phase transition and was crystallized in its purest form without secondary phase formation. Additionally, the prepared compositions showed ten Raman active modes, and the relative density of all the samples exceeded 93.5%. The optical bandgap (E_gap) values and DC conductivities of the samples were in the range of 3.82 eV–3.92 eV and 9.03 × 10⁻¹⁰ Sm⁻¹–2.55 × 10⁻⁹ Sm⁻¹, respectively. The composition 0.925 Mg(Ti_0.95Sn_0.05)O₃–0.075BaTiO₃ exhibited the best dielectric properties having relative permittivity (ɛ_r) of 19.69, loss tangent (tan δ) of 5.1 × 10⁻³, and temperature coefficient of resonant frequency (τ_f) of -8.5 ppm/°C at 1 MHz. In the Ku-band (12.4–18 GHz), this composition showed ɛ_r in the range of 14.62–15.49 and tan δ in the range of 2.85 × 10⁻²–5.89 × 10⁻². An investigation of shielding properties in the Ku-band revealed that the prepared samples delivered average shielding effectiveness in the range of 5.98–6.65 dB. The prepared materials are proposed for microwave applications.

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Title: Synthesis and characterization of temperature stable low-loss (1−x)Mg(Ti0.95Sn0.05)O3–(x)BaTiO3 (0 ≤ x ≤ 0.1) ceramics for microwave applications
Authors: Jasdeep Singh
Shalini Bahel
Publication date: 16-03-2021
Publisher: Springer US
Published in: Journal of Materials Science / Issue 18/2021
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-021-05996-x

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