| Autor: |
Ronald K. Sundfors, T. H. Wang, D. G. Westlake, D. I. Bolef, Peter A. Fedders |
| Rok vydání: |
1975 |
| Předmět: |
|
| Zdroj: |
Physical Review B. 12:26-30 |
| ISSN: |
0556-2805 |
| DOI: |
10.1103/physrevb.12.26 |
| Popis: |
Nuclear-acoustic-resonance studies have been made of single-crystal 99.99% pure tantalum metal from which all hydrogen has been removed (hydrogen concentration much less than 7 at. ppm or 0.04 wt ppm). The shapes and widths of the $^{181}\mathrm{Ta}$ $\ensuremath{\Delta}m=\ifmmode\pm\else\textpm\fi{}1 \mathrm{and} \ifmmode\pm\else\textpm\fi{}2$ absorption lines can be explained as due to quadrupole broadening caused by a random distribution of charged impurities. Unlike hydrogenated Ta, the $\ensuremath{\Delta}m=\ifmmode\pm\else\textpm\fi{}2$ line shape and linewidth for the hydrogen-free specimen are independent of magnet angle and temperature between 78 and 300 K. The measured $^{181}\mathrm{Ta}$ Knight shift is (1.14 \ifmmode\pm\else\textpm\fi{} 0.02)% relative to $^{181}\mathrm{Ta}$ in KTa${\mathrm{O}}_{3}$. The magnitudes and relative signs of the components of the tensor relating electric field gradient to elastic strain are ${S}_{11}=\ifmmode\pm\else\textpm\fi{}26\ifmmode\times\else\texttimes\fi{}{10}^{15}$ statcoulomb ${\mathrm{cm}}^{\ensuremath{-}3}$ and ${S}_{44}=\ensuremath{\mp}29\ifmmode\times\else\texttimes\fi{}{10}^{15}$ statcoulomb ${\mathrm{cm}}^{\ensuremath{-}3}$. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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