Abstract
Hardness and Young's modulus were determined in MgO crystals using a nanoindentation technique. Both nominally pure and hydrogen-doped crystals have a hardness of 9.1 GPa. After thermochemical reduction at 2200 K a hardness value of 10.2 GPa was obtained. Hardness enhancement is associated with oxygen vacancies induced by the thermal treatment. In lithium-doped crystals, the increase to 10.1 GPa after oxidation, and 9.9 GPa after reduction at 1873 K, was attributed to optically active defects absorbing at 1.8 eV and 5.3 eV, respectively. Doping with nickel increases the hardness to 10.1 GPa. Oxidation or reduction of MgO: Ni crystals do not further harden the crystals. In all these crystals, the Young's modulus was 290 GPa, indicating that the elastic properties are not influenced either by impurities or intrinsic defects.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
