Elastic moduli and hardness of η-Ta2N3 from nanoindentation measurements Judith Bourguille, Ovidiu Brinza, Florent Tétard, Sergey Nikitin and Andreas Zerr EPL, 111 1 (2015) 18006 Published online: 31 July 2015 DOI: 10.1209/0295-5075/111/18006