Browsing Exact and Earth Sciences by Author "Leger, Jean Michel"

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    • Hardness and elasticity in cubic ruthenium dioxide 

      Leger, Jean Michel; Djemia, P.; Ganot, F.; Haines, Julian; Pereira, Altair Soria; Jornada, Joao Alziro Herz da (2001) [Journal article]
      The Knoop hardness of the highly incompressible cubic phase of ruthenium dioxide was found to be 19–20 GPa from indentation tests. This value scales well with the shear modulus approximated by the elastic constant C44 of ...

    • Pressure-induced phase transitions and volume changes in Hf02 up to Gpa 

      Leger, Jean Michel; Atouf, A.; Tomaszewski, P.E.; Pereira, Altair Soria (1993) [Journal article]
      The phase transformations and pressure-volume dependence of Hf02 have been investigated at room temperature by angle-dispersive powder x-ray diffraction under high pressure to 50 GPa in a diamond anvil cell. The phase ...

    • Pressure-induced structural phase transitions in zirconia under high pressure 

      Leger, Jean Michel; Tomaszewski, P.E.; Atouf, A.; Pereira, Altair Soria (1993) [Journal article]
      Angular-dispersive x-ray in situ powder-diffraction experiments have been performed on pure zirconia, Zr02, at room temperature under high pressure up to 50 GPa. Under increasing pressure four phases were successively ...