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Issue 11, 2010
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A versatile route for the convenient synthesis of rare-earth and alkaline-earth hexaborides at mild temperatures

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Abstract

In this study, a versatile route is reported for the convenient synthesis of rare-earth hexaborides (RB6, R = La, Ce, Pr, Nd, Sm, Eu) and alkaline-earth hexaborides (AB6, A = Ca, Sr, Ba). The single crystalline cube-like RB6 (R = La, Ce, Pr, Sm, Eu) with mean sizes ranging from 450 to 700 nm were prepared through the co-reduction of rare-earth oxides and boric acid by Mg powder with the assistance of I2 at 170–250 °C. Similarly, NdB6 as well as AB6 (A = Ca, Sr, Ba) can be produced at 350 °C. It is found that CaB6 nanorods with a proportion above 20% and lengths up to several micrometres were produced using CaO as calcium source. When CaCO3 was used instead of CaO, single crystalline hollow CaB6 cages were obtained at 400 °C. The cube-like LaB6 was taken as an example for the synthesis of a series of hexaborides by adjusting the experimental parameters.

Graphical abstract: A versatile route for the convenient synthesis of rare-earth and alkaline-earth hexaborides at mild temperatures

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Article information


Submitted
19 Jan 2010
Accepted
11 May 2010
First published
27 Jul 2010

CrystEngComm, 2010,12, 3923-3928
Article type
Paper

A versatile route for the convenient synthesis of rare-earth and alkaline-earth hexaborides at mild temperatures

L. Wang, L. Xu, Z. Ju and Y. Qian, CrystEngComm, 2010, 12, 3923
DOI: 10.1039/C001167C

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