Various bonding forms of OH groups in hydrogen-treated silica

Abstract
The bonding state of OH groups in silica glasses is studied by examining infrared absorption spectra and thermal annealing characteristics of γ‐induced paramagnetic detect centers. When an oxygen‐rich silica is treated by hydrogen, OH groups exist in the form of those hydrogen‐bonded with nonbridging oxygen (≡Si–O‐‐‐ –H–O–Si≡) besides the forms of H2O and ≡Si–O–H.