Ca9Al(PO4)7 based sintered glass-ceramic for high dielectric breakdown strength
Source abstract
Abstract
A novel Ca 9Al(PO 4) 7 (CAP) based sintered glass-ceramic has been synthesized via the glass melting process and temperature controlled crystallization. The mechanisms of high dielectric breakdown strength (DBS) of the glass-ceramic were analyzed by X-ray diffraction (XRD), field emission scanning electron microscopy, crystal structure and high temperature complex impedance spectroscopy. CAP has a crystal structure similar to β-Ca 3(PO 4) 2 (β-TCP) and a higher band gap (E gap), which makes it difficult for valence electrons to break away from binding and become free charges. At the same time, the isolated vacancy formed by Al replacing Ca becomes a capture site to prevent the transmission of free charge. Furthermore, CAP based glass-ceramic have a high activation energy of grain and grain boundary, which impedes the movement of free charges. All these endow this CAP based sintered glass-ceramic with a high DBS of 110.5 ± 5.3 kV/mm.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Microwave Dielectric Ceramics Synthesis · Semiconductor materials and devices · Electromagnetic wave absorption materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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