Universal hardness and elastic recovery in Vickers nanoindentation of copper phosphate and silicate glasses

T. Miura, Y. Benino, R. Sato, T. Komatsu

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


Load/unload displacement (penetration) curves for yCuOx·(100-y)P2O5 glasses (y=45, 50) with different copper valence states, silica and soda-lime silicate glasses at room temperature (humidity ∼64%) have been measured using a Vickers nanoindentation technique, and universal hardness Hu and elastic recovery ER have been estimated in the load range of 0.1-1 N. Copper phosphate glasses have the values of Hu=1.7-2.5 GPa and ER=0.55=0.65, depending on the Cu+/Cu2+ ratio. The glasses with high Cu+ contents show large densifications (plastic deformation) during loading and small elastic recoveries during unloading compared with the glasses with no Cu+ ions. These deformation behaviors are well explained qualitatively by considering lower coordination number and more covalent bonding of Cu+ compared with Cu2+, which have been confirmed from X-ray photoelecton spectra. Silica glass has ER≒0.77, which is large compared with ER≒0.63 in a soda-lime silicate glass. This large difference leads to the smaller value in Hu of silica glass than that of a soda-lime silica glass. It is confirmed that load displacement curves in nanoindentation tests are well fitted with quadratic equations.

Original languageEnglish
Pages (from-to)409-416
Number of pages8
JournalJournal of the European Ceramic Society
Issue number3
Publication statusPublished - Mar 2003
Externally publishedYes


  • Copper phosphate
  • Glass
  • Hardness
  • Nanoindentation
  • Silicate

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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