Volume 77, Number 4, February 2007
|Number of page(s)||4|
|Section||Atomic, Molecular and Optical Physics|
|Published online||09 February 2007|
Structural characterization of the and compounds by means of hyperfine interaction studies
IFJ PAN, 31-342 Krakow, Poland
2 II. Physikalisches Institut, Universität Göttingen - Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
3 Instituut vor Kern- en Stralingsfisica, K. U. Leuven - Celestijnenlaan 200 D, B-3001 Leuven, Belgium
4 Instituto di Fisica, Universidade de Sao Paulo - CP 66318, 05315-970, Sao Paulo, SP, Brazil
Accepted: 20 December 2006
Electric-field gradients have been measured in the isostructural intermetallic compounds and , using radioactive Ta hyperfine probes. In both compounds, two well-defined electric-field gradients have been observed, whose temperature dependence follows the rule in the temperature range 301170 K. Using the full-potential augmented plane-wave + local-orbitals formalism, the electric-field gradients have been calculated. On the basis of the 181Ta hyperfine interaction parameters, the possible Hf/Zr lattice sites have been assigned. In this way the controversy concerning the lattice structure of these compounds deduced from X-ray diffraction has been solved.
PACS: 31.30.Gs – Hyperfine interactions and isotope effects, Jahn-Teller effect / 61.18.-j – Other methods of structure determination / 61.72.-y – Defects and impurities in crystals; microstructure
© Europhysics Letters Association, 2007
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