セルシアンへの結晶化に及ぼす前駆体Ba交換ゼオライトAの粉砕の効果

抄録

Ba-exchanged zeolite A (Ba-A) as a precursor of celsian, by grinding with various time, was investigated the changes of particle size and crystallinity, then thermal transformation processes of those ground specimens. The particle size and the crystallinity of Ba-A decreased with grinding time. Consequently, Ba-A became almost amorphous with grinding for 20 h. Ba-A, no-grinding sample, became an amorphous material at 300℃ with dehydration, and then generates a small amount of monocelsian in the amorphous material at 600℃, furthermore, hexacelsian formed in addition to the previously produced monocelsian at 1000℃. In contrast, in the amorphous sample ground for 20 h, mainly hexacelsian formed at temperatures above 1000℃. These results suggested that the structure in the amorphous induced by grinding was different from that in the thermal induced amorphous.