Tailorable Dielectric Performance of Niobium‐Modified Poly(hydridomethylsiloxane) Precursor‐Derived Ceramic Nanocompositesстатья
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Дата последнего поиска статьи во внешних источниках: 16 декабря 2020 г.
Аннотация:The low-frequency dielectric behavior of in situ crystallized and stabilizednanocrystalline t-NbO2 in amorphous silicon oxycarbide (SiOC) ceramic nanocompositesderived from niobium-modified poly(hydridomethylsiloxane) (PHMS)is reported. Commercially available PHMS is modified using Nb(OC2H5)5 viachemical and mechanical mixing route. It is observed that the synthesis route andheat-treatment temperatures significantly affect the crystallization of the ceramicphases, where c-NbC and t-NbO2 in amorphous SiOC are formed throughchemical and mechanical modification route, respectively. The variation indielectric permittivity and loss at room temperature with respect to ceramicphases is comprehensively investigated. In contrast to amorphous SiOCceramics derived from PHMS (ε 0 ¼ 100.0 at 1 Hz), t-NbO2 in amorphous SiOCceramic exhibits colossal dielectric permittivity (ε 0 ¼ 5.0 105 at 1 Hz) with lowloss (tan δ <3.0). This is attributed to an interfacial charge polarization andin situ growth of insulator/semiconductor/insulator ceramic phases in amorphousSiOC ceramic nanocomposites.