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Microwave dielectric properties of MgTi11x(Zn1/3B2/3)xO3 (B = Nb5+, Ta5+, 0.025 ̄ x ̄ 0.125) were investigated based on their structural characteristics and the electronegativity difference of the constituent ions. For the specimens of MgTi11x(Zn1/3Nb2/3)xO3, a single phase of the rhombohedral ilmenite structure appeared for the entire range of compositions (0.025 ̄ x ̄ 0.125), while MgTi11x(Zn1/3Ta2/3)xO3 showed a single phase of ilmenite structure up to x = 0.075, and then MgTi2O5 was detected as a secondary phase on further substitution of (Zn1/3Ta2/3) at Ti4+-site of MgTiO3. Quality factor value increased with the electronegativity difference up to an electronegativity difference of 2.015 and was dependent on the degree of covalent character of the bond. Temperature coefficient of resonant frequency decreased with an increase in oxygen octahedral distortion. Dielectric constant of the specimens did not exhibit any remarkable change with the substitution of (Zn1/3B2/3) at Ti4+-site of MgTiO3. ©2018 The Ceramic Society of Japan. All rights reserved.

journal of the ceramic society of japan

Dielectric properties of MgTi&lt;sub&gt;1−&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;(Zn&lt;sub&gt;1/3&lt;/sub&gt;B&lt;sub&gt;2/3&lt;/sub&gt;)&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;O&lt;sub&gt;3&lt;/sub&gt; (B = Nb&lt;sup&gt;5+&lt;/sup&gt;, Ta&lt;sup&gt;5+&lt;/sup&gt;) ceramics at microwave frequencies