Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1594605 | Solid State Communications | 2009 | 4 Pages |
Abstract
The isothermal compressibility of nitrogen doped hafnia (βⲠhafnium oxonitride, Hf7O11N2) has been measured at room temperature up to 28 GPa in a hydrostatic pressure medium, using a diamond anvil cell and X-ray powder diffraction. From a least squares fit to the third-order Birch-Murnaghan Equation of State the values for the bulk modulus and its first pressure derivative were determined to B0=269.4GPa and B0â²=14.9. The exceptionally high value for B0â² arises as consequence of vacancy ordering and subsequently the almost one-dimensional compression of Hf7O11N2 up to pressures of about 12 GPa. The thermal expansion was investigated using temperature dependent X-ray powder diffraction. The coefficient of thermal expansion was calculated according to αv=1/VâδV/δT=a0+a1âT. The parameters were determined to a0=10.389±2.296â10â6Kâ1 and a1=7.34±1.89â10â9Kâ2.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
T. Locherer, L. Dubrovinsky, H. Fuess,