Abstract
The blue lanthanum boride LaB/sub 6+delta/ previously reported as LaB/sub 9/, was investigated in arc-melted samples of LaB/sub 9/ bulk stoichiometry. The samples were structurally analyzed by high-resolution transmission electron microscopy including comparative computer imaging and analytically studied by using backscattered electron imaging, quantitative characteristic x-ray analysis, nuclear magnetic resonance, and other techniques. The blue boride observed has a composition of LaB/sub 6.13 +- 0.03/ due to random La vacancies in the LaB/sub 6/ structure and is interpreted as belonging to the nonstoichiometric LaB/sub 6/ phase region. The color change from purple to blue occurs for decreasing lanthanum content roughly at a composition LaB/sub 6/ /sub 07/. A modification of the La-B phase diagram is proposed.
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