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Investigation of the structural, dielectric, and reflective characteristics of thermally stable magnesium titanate ceramics

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Abstract

A series of substituted magnesium titanates with general formula (0.96 CoxMg1-xTiO3—0.04 ySrTiO3); (x = 0.00, 0.05, 0.075; y = 0.00, 1) was synthesized by auto-ignition combustion method. The effects of SrTiO3 addition on structural, dielectric and reflection properties of synthesized ceramics were investigated. A single-phase system with MgTiO3 as the major phase was confirmed by X-ray diffraction (XRD) examination of the generated compositions. In addition, a small amount of SrTiO3 was detected in the compositions y = 1.0. The MgTiO3 phase was found to have trigonal symmetry with space group R¯3 by Rietveld refinements., In contrast, the SrTiO3 phase exhibited cubic symmetry and a space group Pm¯3 m.The existence of 10 Raman active modes in all the compositions was confirmed by Raman Spectroscopy. However, it was observed that as the concentration of Co increased from composition x = 0.00 to x = 0.075 the modes were shifted toward higher wavenumber. The dielectric properties of all the studied samples were evaluated using an impedance analyzer at a frequency of 100 kHz. The composition 95 MCST (0.96 Mg0.95Co0.05 TiO3—0.04 SrTiO3) with (τf = 3.17 ppm/°C, tan δ = 1.97 × 10–3, and εr = 20.77 at a frequency of 100 kHz) had the most desirable set of dielectric characteristics. This composition also possesses more than 90% reflection for a bandwidth of 4.83 GHz and 1.36 GHz in the Ku and K frequency bands respectively. Due to its low-to- medium εr, low tan δ, almost zero τf, and favorable reflection properties, the 0.96 Mg0.95Co0.05TiO3 – 0.04 SrTiO3 composition can be used for 5G applications as well as a microwave absorber or shielder.

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Funding

This work is financially supported by the Ministry of Electronics and Information Technology (MeitY), Government of India. [Grant No.: MEITY-PHD-2742].

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  1. Department of Electronics Technology, Guru Nanak Dev University, Amritsar, Punjab, India

    Komal Sharma, Hardeep Kaur & Shalini Bahel

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  1. Komal Sharma
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KS: Synthesis and Characterization, Software, Data Analysis, Writing. HK and SB: Review, edit, and supervised the whole manuscript.

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Correspondence to Shalini Bahel.

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Sharma, K., Kaur, H. & Bahel, S. Investigation of the structural, dielectric, and reflective characteristics of thermally stable magnesium titanate ceramics. J Mater Sci: Mater Electron 34, 2135 (2023). https://doi.org/10.1007/s10854-023-11466-8

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