TY - JOUR
T1 - Diffraction Studies of a Highly Metastable Form of Amorphous Silica
AU - KONNERT, JOHN
AU - D'ANTONIO, PETER
AU - HUFFMAN, MARIA
AU - NAVROTSKY, ALEXANDRA
N1 - Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 1987/3
Y1 - 1987/3
N2 - An amorphous powder of SiO2 that calorimetric studies indicated to be energetically metastable by 46.9 ± 0.8 kj/mol relative to fused silica was studied by X‐ray diffraction. A calculation of the energetic instability, based on the bond length and bond angle distributions derived from the diffraction data and utilizing the force constants for bond stretching and bending, indicated that 41.3 ± 7.9 kj/mol of the instability may be associated with distortions of the Si‐O bonds, the O‐Si‐O bond angles, and the Si‐O‐Si angles. Analyses of the extensive small‐angle scattering from the porous material suggested that only a small portion of the instability is associated with surface structures.
AB - An amorphous powder of SiO2 that calorimetric studies indicated to be energetically metastable by 46.9 ± 0.8 kj/mol relative to fused silica was studied by X‐ray diffraction. A calculation of the energetic instability, based on the bond length and bond angle distributions derived from the diffraction data and utilizing the force constants for bond stretching and bending, indicated that 41.3 ± 7.9 kj/mol of the instability may be associated with distortions of the Si‐O bonds, the O‐Si‐O bond angles, and the Si‐O‐Si angles. Analyses of the extensive small‐angle scattering from the porous material suggested that only a small portion of the instability is associated with surface structures.
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U2 - 10.1111/j.1151-2916.1987.tb04956.x
DO - 10.1111/j.1151-2916.1987.tb04956.x
M3 - Article
AN - SCOPUS:0023306987
SN - 0002-7820
VL - 70
SP - 192
EP - 196
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 3
ER -