Using a synchrotron radiation source and a diamond anvil cell, we measured the pressure dependence of the lattice parameters of a polycrystalline sample up to a pressure of 55 GPa. No phase transformations were observed. As observed in , and , the compressibility of along the axis was larger than along the axis which leads to a decrease in the ratio with increasing pressure. The bulk modulus is , with a pressure derivative of .
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© 2005 American Institute of Physics.
2005
American Institute of Physics
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