The lithium- and sodium-enhanced transformation of Ba-exchanged zeolite LTA into celsian phase

被引：16

作者：

Dondur, V. ^{[1
]}

Dimitrijevic, R. ^{[2
]}

Kremenovic, A. ^{[2
]}

Damjanovic, Lj. ^{[1
]}

Romcevic, N. ^{[3
]}

Macura, S. ^{[4
]}

机构：

[1] Univ Belgrade, Fac Phys Chem, Belgrade 11000, Serbia

[2] Univ Belgrade, Dept Crystallog, Fac Min & Geol, Belgrade 11000, Serbia

[3] Inst Phys, Belgrade 11080, Serbia

[4] Mayo Clin, Coll Med, Dept Biochem, Rochester, MN USA

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2008年 / 69卷 / 11期

关键词：

Ceramics; Chemical synthesis; Crystal structure; Phase transitions;

D O I：

10.1016/j.jpcs.2008.07.007

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The Li+- and Na+-doped hexacelsians (HC) synthesized from Ba-LTA synthetic zeolite as precursors were used for preparation of monoclinic celsians (MC). The doped pure MC and mixture HC/MC species were obtained by thermally induced polymorphous transformation at 1200 degrees C. Synthesized-doped MC have been characterized by X-ray powder diffraction and spectroscopic (infrared, Raman and Si-29 magic angle spinning nuclear magnetic resonance) methods. The obtained results Suggest that in all investigated samples Na+ or Li+ dopants were incorporated in MC crystal structures during thermal transformation of a zeolite. It has been shown that HC -> MC transformation depends on molar fractions of alkali cations. These findings combined with used temperature/time conditions could help in optimization of MC synthesis route. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：2827 / 2832

页数：6

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