Articles written in Bulletin of Materials Science

    • Structural, vibrational and microwave properties of $x$La(Mg$_{1/2}$Ti$_{1/2}$)O$_3$–($1 - x$)Ba(Mg$_{1/3}$Nb$_{2/3}$)O$_3$


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      Vibrational and microwave dielectric properties of $x$La(Mg$_{1/2}$Ti$_{1/2}$)O$_3$–($1 - x$)Ba(Mg$_{1/3}$Nb$_{2/3}$)O$_3$ ($x = 0.0, 0.1,0.3, 0.5, 0.7, 0.9$ and 1.0) synthesized by the solid-state reaction technique are investigated. The Rietveld refinement of the X-ray diffraction (XRD) data confirms that Ba(Mg$_{1/3}$Nb$_{2/3}$)O$_3$ ($x = 0.0$) adopts the 1:2-ordered structure with trigonal P-3$m$1 space group, whereas La(Mg$_{1/2}$Ti$_{1/2}$)O$_3$ ($x = 1$) has monoclinic $P2_1/n$ crystal structure. Both the materials have single phase crystal structure. For $x = 0.1$, the sample is found to have double phase. Further, with the increase in the value of $x$, the crystal structure becomes monoclinic $P2_1/n$. The vibrational properties of the materials are studied by the Raman spectroscopy and are correlated with the structural parameters. All the materials show high dielectric constant ($\epsilon_r$ > 35) at microwave range. The factors affecting the microwave dielectric properties are discussed based on the vibrational andstructural data.

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