July 17, 2015
Thermochimica Acta, 419 (2004), pg. 135–141
Authors: Yi He
Ceramic material acts most generally as a dielectric. It is composed of two or more alternating layers of ceramic material and a metal layer acting as the electrodes. Most commonly the composition of the ceramic material defines the electrical potential. The material is broken up into classes based on composition and the applications.
“When dielectrics are placed in an electric field, practically no current flows in them because, unlike metals, they have no loosely bound, or free, electrons that may drift through the material.” – Encyclopedia Britannica
Article Summary: Barium titanate (BaTiO3) ceramics are most frequently used in the electronics industry as dielectric layers in manufacturing multilayer ceramic capacitors (MLCCs). Heat capacities of two different barium titanate ceramic materials were determined as a function of temperature using differential scanning calorimetry (DSC). With the use of Archimedes` principle, they were also able to determine the densities of the materials at room temp. From here they were able to determine the thermal conductivities and thermal diffusivities of the materials using a TPS sensor. These sensors are from the transient plane source technique for thermal measurements. Lastly, they determined the thermal expansion coefficients of the materials using thermomechanical analysis (TMA) from -50 to 250°C.
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