Thisworkaimedtoresearchthestructuremodelsofamorphousmaterials.Fiveamorphousandparacrystallinesamples（naturalorartificial）wereinvestigatedvia29Si/27Alnuclearmagneticresonance（NMR）andfieldemissionscanningelectronmicroscopy/energydispersivespectroscopy（FE-SEM/EDS）.TheresultsofNMRshowedtheresonancesofdifferentspecimens：-93.2ppm,-101.8ppm,-111.8ppmfornaturalpozzolanaopalshale（POS）.ThesepeakswereassignedtotheQ2（2OH）,Q3（OH）/Q4（1Al）andQ4respectively.Theresultsof27AlMASNMRindicatedthatAlsubstitutedforSisiteintetrahedralexistinginthePOS,whiletheAl/Siatomicratioinopalwaslow（around0.04）.Forthealkali-silicate-hydrategel,therewereatleastthreeresolvedsignalsassignedtoQ0andQ1,respectively.Forthefusedsilicaglasspowder,thereweretheprimarysignalscenteredaboutattherangefrom-107to-137ppm,whichwereassignedtoQ4units.Inaddition,thepeaksataround-98and-108ppmwerecorrespondingtoQ3（1OH）andQ4unitsexistinginaerogelsilicastructure.
