The effect of crystallite size and stress condition on the equation of state of nanocrystalline MgO

We performed high-pressure synchrotron x-ray diffraction experiments on nanocrystalline (nc-) MgO compressed both under quasi-hydrostatic and non-hydrostatic conditions in a diamond-anvil cell. Data obtained under hydrostatic conditions show that nc-MgO (average crystallite size of 20nm) is 8-9% mor...

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Bibliographic Details
Published in:Journal of applied physics 2011-12, Vol.110 (11), p.113512-113512-5
Main Authors: Marquardt, H., Speziale, S., Marquardt, K., Reichmann, H. J., Konôpková, Z., Morgenroth, W., Liermann, H.-P.
Format: Article
Language:English
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Summary:We performed high-pressure synchrotron x-ray diffraction experiments on nanocrystalline (nc-) MgO compressed both under quasi-hydrostatic and non-hydrostatic conditions in a diamond-anvil cell. Data obtained under hydrostatic conditions show that nc-MgO (average crystallite size of 20nm) is 8-9% more compressible than "bulk" MgO. Analysis of our results collected under non-hydrostatic conditions yields a bulk modulus that is about 27% larger than the one derived from the quasi-hydrostatic compression experiments. Thus, the apparent bulk modulus strongly depends on the experimental stress conditions.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3662491