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Shear induced phase transition in PbO under high pressure |
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| Authors: | Hubertus Giefers Felix Porsch |
| Affiliation: | aDepartment of Physics and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, USA bMineralogisch-Petrologisches Institut, Universität Bonn, 53115 Bonn, Germany |
| Abstract: | We have studied the structural behavior of lead monoxide (PbO) as a function of pressure via angular dispersive X-ray diffraction employing two different pressure transmitting media that were quasi-hydrostatic (N2) and non-hydrostatic (MgO), respectively. Besides litharge (-PbO) and massicot (β-PbO), which are both stable at ambient pressure, there is an orthorhombic γ-PbO phase which appears upon application of pressure to -PbO. We have found that the orthorhombic γ-PbO phase is favored by shear stress under non-hydrostatic conditions. -PbO shows strong anisotropy in compressibility. The a-axis is rather incompressible with a linear stiffness coefficient of Ka0=540(30) GPa whereas the c-axis stiffness is Kc0=25(1) GPa. The bulk modulus of -PbO is K0=23.1(3) GPa and its derivative . |
| Keywords: | Lead monoxide High pressure X-ray powder diffraction Equation of state Shear stress favored phase transition |
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