Investigation of setting reaction in magnesium potassium phosphate ceramics with time resolved infrared spectroscopy
Investigation of setting reaction in magnesium potassium phosphate ceramics with time resolved infrared spectroscopy
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DOI：
10.1016/j.matlet.2017.06.063
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发表时间：
2017-10
影响因子：
3
通讯作者：
P. Mácová;A. Viani
中科院分区：
文献类型：
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作者：
P. Mácová;A. Viani
缺乏对材料设计至关重要的磷酸镁钾陶瓷反应产物的关键信息。凝固反应通过时间分辨红外光谱进行跟踪，并得到二维相关光谱的支持。我们发现了第一个无定形正磷酸盐前体（可能是 MgKPO4·H2O）早期形成的证据，以及第二个中间无定形相（结构上与 MgKPO4·6H2O 更相似）形成较晚的证据。 MgKPO4·6H2O 的结晶从最后一个阶段开始。排除了被鉴定为来自稀释悬浮液的沉淀物的无定形 Mg(OH)2 和磷酸镁的存在。这组复杂的平行反应与磷酸锌水泥的反应类似，并且与最近的核磁共振结果一致。
Crucial information on reaction products in magnesium potassium phosphate ceramics, essential for material design, is lacking. Setting reaction has been followed with time resolved infrared spectroscopy, supported by 2D correlation spectroscopy. We found evidence of a first amorphous orthophosphate precursor, possibly MgKPO4·H2O, forming early, and of a second intermediate amorphous phase, more structurally similar to MgKPO4·6H2O, forming later. Crystallization of MgKPO4·6H2O occurs from this last phase. Presence of amorphous Mg(OH)2and magnesium phosphates identified as precipitates from diluted suspensions, was excluded. This complex set of parallel reactions, bears analogies with reaction of zinc phosphate cements and is consistent with recent NMR results.