MECHANISMS OF INCIPIENT CHEMICAL REACTION BETWEEN CA(OH)(2) AND SIO2 UNDER MODERATE MECHANICAL STRESSING .1. A SOLID STATE ACID-BASE REACTION AND CHARGE TRANSFER DUE TO COMPLEX FORMATION

摘要

Mechanisms of an incipient reaction between Ca(OH)(2) and SiO2 under mechanical stressing are studied mainly by detailed infrared (IR), X-ray photoelectron (XPS), and solid state H-1-NMR spectroscopies. Pretreatments by H-D exchange, adsorption of pyridine or ammonia were carried out prior to IR spectroscopy. From the comparison between the separate and mixed-milling, a solid state acid-base reaction and simultaneous dehydration are revealed. Subsequent charge transfer, confirmed by XPS, leads to the formation of a precursor of complex oxides involving Ca-O-Si bonding. (C) 1996 Academic Press, Inc. [References: 25]