Analytical and structural analysis of the lanthanum-deficient lanthanum hexaboride
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.
- Research Organization:
- Arizona State Univ., Tempe
- OSTI ID:
- 6567013
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:9; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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BORIDES
BORON COMPOUNDS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DIAGRAMS
DIFFRACTION
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
INFORMATION
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LANTHANUM COMPOUNDS
MICROSCOPY
MOLECULAR STRUCTURE
NMR SPECTRA
NUMERICAL DATA
PHASE DIAGRAMS
RARE EARTH COMPOUNDS
SCATTERING
SPECTRA
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION