Abstract
Forsterite single crystals were grown by the Czochralski technique in air. The lattice parameters were determined by X-ray power diffraction. The IR and Raman spectra of pure and doped (V3+, V5+, and Ni4+) Mg2SiO4 single crystals were measured at room temperature. We studied the phonon properties and discussed the influence of dopants.
Highlights
The most abundant mineral in the lower part of the transition zone of the earth, αMg2SiO4 has extremely low electrical conductivity, low dielectric-constant εr, and low dielectric-losses
Aside from exploring optical properties in the visible range, special attention has been paid to vibrational spectra, to the local A1 mode which plays an important role in the mechanism for non-radiative deexcitation in the 3T1 crystal field (CF) state [3]
Our calculated results for the lattice parameters of doped forsterite are a = 0.4752 (2) nm, b = 1.0191 (1) nm, c = 0.5977 (1) nm for V2O3 dopant, a = 0.475037 (2)nm, b = 1.01896 (5) nm, c = 0.59744 (1) nm for V2O5 dopant, and a = 0.4453 (2) nm, b = 1.0187 (1) nm, c = 0.5976 (1) nm for NiO2 dopant, which are in good agreement with the published data
Summary
The most abundant mineral in the lower part of the transition zone of the earth, αMg2SiO4 (forsterite) has extremely low electrical conductivity, low dielectric-constant εr, and low dielectric-losses. Aside from exploring optical properties in the visible range, special attention has been paid to vibrational spectra, to the local A1 mode which plays an important role in the mechanism for non-radiative deexcitation in the 3T1 crystal field (CF) state [3]. This mode is the only local one involved in the vibrational progression observed in the low temperature optical spectra [4]. The laser spot size on the sample surface was obtained by a microscope setup with 10x objective magnification
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