Elastic moduli of η‐Ta2N3, a tough self‐healing material,via laser ultrasonics |
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| Authors: | Andreas Zerr Nikolay Chigarev Ovidiu Brinza Sergey M Nikitin Alexey M Lomonosov Vitalyi Gusev |
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| Institution: | 1. LSPM‐CNRS, Université Paris Nord, 99 Av. J. B. Clement, 93430 Villetaneuse, France;2. LAUM, CNRS, Université du Maine, Av. Olivier Messiaen, 72085 Le Mans, France;3. LPEC, CNRS, Université du Maine, Av. Olivier Messiaen, 72085 Le Mans, France;4. General Physics Institute, Russian Academy of Sciences, 38, Vavilov street, 119991 Moscow, Russia |
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| Abstract: | The elastic moduli of the dense polycrystalline oxygen‐bearing η‐Ta2N3, a novel hard and tough high‐pressure (HP) material, were measured using the laser ultrasonic technique. The bulk modulus was determined to be B0 = 281(15) GPa which is only ～11% below that from HP compression measurements. Our value of the shear modulus G0 = 123(2) GPa is below those ones predicted theoretically for model structures. The discrepancies in G0 could be due to a substitution of an‐ ions and the formation of cation vacancies in η‐Ta2N3. Self‐healing behaviour of η‐Ta2N3 by mechanical polishing was observed and confirmed by two independent experimental methods. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
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| Keywords: | bulk modulus shear modulus sound velocity acoustic waves Ta2N3 self‐healing |
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