Characterization by X ray diffraction of mechanically alloyed tripotassium sodium sulfate

AUTOR(ES)

Miranda, Marcus Aurélio Ribeiro, Sasaki, José Marcos, Sombra, Antônio Sérgio Bezerra, Silva, Cléber Costa, Remédios, Cláudio Márcio Rocha

FONTE

Materials Research

DATA DE PUBLICAÇÃO

2006-06

RESUMO

Nanocrystalline powder of tripotassium sodium sulfate (K3Na(SO4)2 - KNS) was successfully obtained by mechanical alloying a mixture of potassium sulfate (K2SO4) and sodium sulfate (Na2SO4) with a proportion of 3:1 in a planetary mill. X ray powder diffraction (XRPD) was used to characterize this material. Powders produced with high milling times: 15, 30, 45 and 60 hours, have shown a single phase. For 60 hours of milling time, the powder was formed with very small grains (60 nm in average). We also prepared several samples with low milling times: 30, 60, 120, 150 and 180 minutes. The results for this series show that 120 minutes of milling is enough to produce a single crystalline phase of KNS. Therefore, we showed that a nanocrystalline powder of tripotassium sodium sulfate is easily obtained by mechanical alloying and that the grain size can be controlled by the amount of milling time.

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