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- W1565173622 abstract "We report here the results of Raman scattering measurements to 30 GPa on polycrystalline end-member Mj 100 tetragonal majorite and two majorite-garnet solid solutions, Mj 50 Py 50 and Mj 80 Py 20 (where Mj = Mg 4 Si 4 O 12 and Py = Mg 3 Al 2 Si 3 O 12 ), synthesized at 17.7 GPa and 2000°C. The results are discussed in light of previous Raman, X ray, and elasticity studies. At ambient pressure, variations in the Raman spectra indicate changes in the structure and disorder with increasing Py content. For example, the spectra of Mj 100 confirm its tetragonal structure, and the two bands in Mj 100 at ∼885 cm -1 and ∼928 cm -1 merge in the case of Mj 80 Py 20 and Mj 50 Py 50 . The spectra of Mj 50 Py 50 and Mj 80 Py 20 show similarity to those of Py 100 (cubic garnet structure) and (Mg 79 Fe 21 ) 4 Si 4 O 12 majorite from the Catherwood meteorite, which also has cubic structure. The pressure dependencies of the Raman frequencies for all the modes are found to be linear, without discontinuities, throughout the pressure range of this study, implying no major structural changes. Using the pressure shift of the Raman bands, (∂v i /∂P), the mode Gruneisen parameters, γ l , are calculated using the bulk modulus values measured by Brillouin spectroscopy. The averaged values of mode γ l for the three Mj-Py samples lie in the range 0.81-1.13, lower than those of pyrope garnet (1.5) but close to γ th ∼1.1 calculated for Mj 58 Py 42 ." @default.
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- W1565173622 date "1998-01-01" @default.
- W1565173622 modified "2023-09-24" @default.
- W1565173622 title "High-pressure raman scattering study of majorite-garnet solid solutions in the system Mg4Si4O12—Mg3Al2Si3O12" @default.
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- W1565173622 doi "https://doi.org/10.1029/gm101p0129" @default.
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