Synthesis of layered sodium lanthanum selenide through ion exchange reactions

被引：5

作者：

Butts, Laura J. ^{[1
]}

Strickland, Nicholas ^{[1
]}

Martin, Benjamin R. ^{[1
]}

机构：

[1] Texas State Univ San Marcos, Dept Chem, San Marcos, TX 78666 USA

来源：

MATERIALS RESEARCH BULLETIN | 2009年 / 44卷 / 04期

关键词：

Layered compounds; Chemical synthesis; Intercalation reactions; X-ray diffraction; SULFIDES; CHALCOGENIDES; CHEMISTRY; NALNS2;

D O I：

10.1016/j.materresbull.2008.09.012

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Layered hexagonal KLaSe2 (alpha-NaFeO2-type) was synthesized using the reactive flux method and analyzed by powder XRD to determine its lattice constants (space group R-3m, a = 4.40508(5) angstrom, c = 22.7838(5) angstrom). NaLaSe2, which normally crystallizes as a disordered rock salt structure with mixed Na+/La + 3 sites. was synthesized through a solid state ion exchange reaction at 585 degrees C from a 1:3 molar ratio mixture of KLaSe2:Nal. The product of this reaction was hexagonally layered NaLaSe2 (space group R-3m, a = 4.3497(3) angstrom, c = 20.808(2) angstrom) isostructural to KLaSe2. This product was analyzed by comparison with members of the set of solid solutions Na(1-x)K(x)LaSe2 to confirm that the extent ion exchange in this reaction was complete. Cubic (disordered) NaLaSe2 was also reacted with KI to yield the poorly crystalline hexagonally layered product with the approximate formula Na0.79K0.21LaSe2. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：854 / 859

页数：6

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