Effect of Syntesis and Frequency on Electrical Properties on Dielectric Ceramics MgCO3-TiO2

Vera V. Petrovic; Hranislav Milosevic

doi:10.4028/www.scientific.net/AMR.875-877.1554

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 875-877Effect of Syntesis and Frequency on Electrical...

Effect of Syntesis and Frequency on Electrical Properties on Dielectric Ceramics MgCO₃-TiO₂

Abstract:

Magnesium titanate based dielectric materials are used for producing type-I capacitors. A common way of obtaining this material is a solid-state reaction. The process of sintering can be enhanced if mechanical activation preceedes. In this work starting powders of magnesium carbonate (MgCO₃) and titanium dioxide (TiO₂) with a rutile crystal modification were weighed to attain a 1:1 molar MgCO₃:TiO₂. Mechanical activation of the starting mixture was performed by high energy ball milling using ZrO balls and vessels with ball to powder mass ratio 40:1. The observed grinding times were 15, 30, 60 and 120 minutes. The isothermal sintering of compacted powders was conducted at 1100°C during 30, 60 and 180 minutes. For specimens synthesized in such a manner, microwave dielectric properties were measured, quality factor Q and the dielectric constant (ε_r) in function of frequency. The measurements of electrical resistivity, capacitance and loss tangent of samples were measured in the frequency range from 500 Hz to 5 MHz frequencies with a HIOKI 3532-50 LCR HiTESTER device at a constant voltage mode (amplitude 0.5 V of sinusoidal signal applied to the specimens).

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Periodical:

Advanced Materials Research (Volumes 875-877)

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1554-1559

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.875-877.1554

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February 2014

Authors:

Vera V. Petrovic, Hranislav Milosevic

Keywords:

Dielectric Constant, Mechanical Activation, Quality Factor, Sintering

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