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A recent announcement [Phys. Rev. Lett. 107, 075503, (2011)], after anomaliesin the thermal expansion, of a previously unknown martensitic transformation inpure Nb, Ta and V is discussed in the light of anelastic measurements on Nbsamples with comparable purities. It results that the effects of the allegedtransformation on the anelastic spectra would be at least three orders ofmagnitude smaller than in typical martensitic transformations. A possiblealternative explanation for the observed anomalies is proposed in terms ofprecipitation of unnoticed residual H.

On the recently proposed martensitic-like structural transformation in V, Nb, and Ta