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Integrated Ferroelectrics
An International Journal
Volume 105, 2009 - Issue 1
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Original Articles

DIELECTRIC INVESTIGATIONS OF LANTHANIDES (Ln = Sm, Nd AND Gd) SUBSTITUTED BARIUM TITANATE MICROWAVE CERAMICS

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Pages 87-98 | Received 29 Apr 2009, Published online: 20 Sep 2010
 

ABSTRACT

Dielectric properties have been investigated and compared for three series of ceramic compounds based on complex oxides with molecular formula Ba6 − 3x Ln8 + 2x Ti18O54 with Ln (lanthanide) = Sm, Nd and Gd and x = 0.0 – 0.7. X-Ray diffraction (XRD) was employed to study the crystal structure of the sintered ceramics. Fired densities have been observed to be almost constant up to a certain composition then decreased with an increase in x. Values of dielectric constant (ε′) and loss tangent (tanδ) were decreased with increased composition as well as frequency. The temperature coefficient of resonant frequency (τf) was estimated in the temperature range of 20°C to 80°C.

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