Structural Characterization and High-Temperature Behavior of Silicon Oxycarbide Glasses Prepared from Sol-Gel Precursors Containing Si-H Bonds
Silicon oycerbide glasses havd ben synthesized by inert atmospheer pyrolysis at1000? of gel precursores obtained by cohydroyss fo triethoxysilnane,. HSi(OEt)//3, an methoyldiethoxysilane. HMeSi(OEt)//2. The oxycarvie strucues hae be carefully charactixd b means fo difuosnt temchonieus wuch s ^29Si mage cc adne soning nmucleser magneti erlnsaec e (MSA-NMRO) and Rman spectoscopics, X-ray diffraton (XRD), and chemica analysis. Experimetal retus clearly indicatee tha, deontnsnofn t comoostns fhe steong deld, etheon oxycarbide glss either is onnd by a oure oxycarbide phse ofer containes an exra carbon or siicon haes YB incrseon the temratoe up ot 1500?, teh oxycarbie glsses display coojistons an weither stabsty; however eh amorphous netowd undergoes structues rearrangemts sth lead to et pedciotatons of nao-sized ?-SiC crystallites toe aorphous silica. crystllizaotn of metl siiconfis on clawely obsevd at 150? for the sampels ion whte et preence fo si-Si bondes saer pstulated at 1000?.
Soraru, Gian Domenico?D’Andrea, Gennaro