Institute of Material Science, University of Silesia, 75 Pułku Piechoty 1a, 41-500, Chorzow, Poland.
Silesian Center for Education and Interdisciplinary Research, 75 Pułku Piechoty 1a, 41-500, Chorzow, Poland.
Sci Rep. 2017 Aug 22;7(1):9046. doi: 10.1038/s41598-017-08152-1.
Chlormayenite CaAlO[♦Cl] (♦-vacancy) is partially hydrated micro porouss mineral with hydroxide groups situated at various crystallographic sites. There are few mechanisms describing its hydration. The first one assumes Cl substitution by OH at the center of the structural cages (W-site). The second one determines the converting a T1O tetrahedron to a T1O(OH) octahedron due to the replacement of oxygen at the O2 site by three OH-groups according to the scheme: (O + Cl) → 3 × OH. The third mechanism, not considered so far in the case of zeolite-like minerals, includes the hydroxide incorporation in form of hydrogarnet defect due to the arrangement of tetrahedral (OH) in vacant cages. This yields a strong hydrated phase containing even up to 35% of water more than in any currently known mineral applicable to Portland cement. Moreover, water molecules present in different structural cages are stable up to 355 K while dehydroxylation linked to the gradual loss of only 8% of OH groups according to 3 OH → O + OH + HO occurs at temperature range from 355 K to 598 K.
氯镁钙石 CaAlO[♦Cl]（♦-空位）是一种部分水合的微孔矿物质，其羟基基团位于不同的晶体位置。有几种机制描述了它的水合作用。第一种机制假设 Cl 在结构笼（W 位）的中心被 OH 取代。第二种机制决定了由于 O2 位的氧被三个 OH 基团取代，T1O 四面体转化为 T1O(OH)八面体，根据该方案：（O + Cl）→ 3 × OH。第三种机制，迄今为止在沸石状矿物中尚未考虑，包括由于四面体（OH）在空位笼中的排列，以水榴石缺陷的形式掺入羟基。这产生了一个强水合相，其中甚至含有多达 35%的水，比任何目前已知适用于波特兰水泥的矿物都多。此外，存在于不同结构笼中的水分子在高达 355 K 的温度下稳定，而与羟基逐渐损失仅 8%相关的脱羟作用，根据 3 OH → O + OH + HO，在 355 K 至 598 K 的温度范围内发生。
