Abstract
AbstractTantalum deuterides in the composition range TaD0.43–TaD0.76 were investigated by means of deuteron nuclear magnetic resonance over the temperature range from 4.2 to 400 K. The β‐α phase transition, in the temperature range 320–370 K for these compounds, is sharply defined by the extinction of the deuteron quadrupole interaction when the cubic α phase is reached. These results are discussed in relation to other determinations of the β‐α transition temperature. No other significant changes in the NMR spectrum are observed, down to 4.2 K, at which temperature the quadrupole coupling constants are equal, within the experimental uncertainty, having the value, e2qQ/h = 33.9 ± 0.7 kHz, independent of composition. The asymmetry parameter values, however, tend toward zero with increasing deuterium content. It is noted that the thermal width of the β‐α transition is increased by high oxygen content of the tantalum metal.
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