Phys. Rev. B 77, 134303 (2008) [7 pages]Infrared properties of ferropericlase Mg1−xFexO: Experiment and theoryReceived 19 April 2007; revised 15 January 2008; published 4 April 2008 The temperature dependence of the reflectance spectra of magnesium oxide (MgO) and ferropericlase (Mg1−xFexO, for x=0.06 and x=0.27) have been measured over a wide frequency range (≈50−32 000 cm−1) at 295 and 6 K. The complex dielectric function has been determined from a Kramers-Kronig analysis of the reflectance. The spectra of the doped materials resemble pure MgO in the infrared region, but with much broader resonances. We use a shell model to calculate the dielectric function of ferropericlase, including both anharmonic phonon-phonon interactions and disorder scattering. These data are useful in understanding the vibrational properties of ferropericlase. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.77.134303
DOI:
10.1103/PhysRevB.77.134303
PACS:
63.20.K−, 63.20.kp, 74.25.Kc, 78.30.−j
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