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|Type:||Artigo de periódico|
|Title:||The Effect Of The Conditions Of The Treatment Of Gel On The Crystallinity Of The Layered Compound Zirconium (iv) Bis(phosphite)|
|Abstract:||The conditions of treatment of gels obtained by the reaction of Zr4+ and H3PO3 with the formation of layered compound Zr(HPO3)2. nH2O are analyzed. An increase of the degree of crystallinity with the molar ratio H3PO3/Zr4+ was observed. For conditions where the ratio is < 5:1 the X-ray patterns indicate that a non-crystalline material is formed. The FTIR spectra show that the P-H stretching mode (∼2460 cm-) is very sensitive to the organization of the layers. The temperature and time of gel treatment also increases the degree of crystallinity. The combination of these parameters allows us to modulate the crystallinity of this material. © 1990.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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