Strength of magnesium oxide under high pressure:13; evidence for the grain-size dependence

Singh, AK and Liermann, HP and Saxena, SK (2004) Strength of magnesium oxide under high pressure:13; evidence for the grain-size dependence. Solid State Communications, 132. pp. 795-798.

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X-ray diffraction patterns from magnesium oxide compressed in a diamond anvil cell up to 55 GPa have been recorded and13; the differential stress (a measure of compressive Strength) and grain-size (crystallite size) determined as a function of pressure from the line-width analysis. The strength agrees well with the uniaxial stress component (another measure of compressive strength) derived earlier from the line-shift data. The strength increases while the crystallite size decreases steeply as the pressure is raised from ambient to w10 GPa. The increase in strength is much smaller at higher pressures. The strength-pressure13; data are explained by combining the grain-size dependence of strength and the shear-modulus scaling law. The dependence of strength on grain-size has not been considered in the past in the discussion of high-pressure strength data.

Item Type: Article
Additional Information: Copyright belongs to Elsevier Science Ltd.,
Uncontrolled Keywords: A.Magnesium oxide;D.Compressive strength;D.Elasticity;D.X-ray diffraction;E.High pressure
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Mr. N A
Date Deposited: 24 Jun 2006
Last Modified: 03 May 2012 05:21

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