Dielectric properties of nanocomposite ceramics Al2O3 / graphene processed by spark plasma sintering
Source abstract
Abstract
Abstract Al2O3/graphene nanocomposites with graphene contents of 1 and 2 wt % were obtained by the SPS method and were characterized by means of electron microscopy and Raman spectroscopy. The aim of this work was to study the effect of graphene content on the temperature and frequency dependences of the electrical resistivity in nanocomposite ceramics. Using the impedance method with alternating current, the ceramic materials were studied over a wide temperature range, 23–530 °C and over a frequency range of 10−1 – 106 Hz. More than a half decrease in the porosity of the sintered composite with an increase in the graphene content was observed. Raman spectroscopy indicated the absence of graphene degradation during the SPS. The range of frequencies (100–103 Hz) and temperatures (23–130 °C) in which the dielectric can exhibit electron or ionic conductivity were determined.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Graphene research and applications · Electromagnetic wave absorption materials · Dielectric materials and actuators
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