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|Type:||Artigo de periódico|
|Title:||Non-crystalline aluminum polyphosphates: Preparation and properties|
|Abstract:||Simultaneous admixture of aluminum nitrate, sodium polyphosphate and ammonium hydroxide yields aluminum polyphosphate powders. Preparations were performed following a two-level factorial plan in which the variables were the reagent concentrations. Eight different powders were obtained and characterized by elemental analysis, X-ray diffraction, infrared spectrophotometry, scanning electron microscopy, and thermalconductimetric analysis. The properties of the powders are strongly dependent on their chemical compositions, specially on the P/Al mol ratio. A higher thermal stability is observed when P/Al less than or equal to 1. In the case of P/Al greater than or equal to 1 powder particles sinter at ca. 500 degrees C, and they soften and expand at ca. 700 degrees C yielding closed cell monoliths and powders. Softening temperatures are easily detected by thermalconductimetric analysis.|
non crystalline solids
|Editor:||Soc Brasileira Quimica|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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