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Synthesis of pyrope-knorringite solid solution series

Akimoto, Pyroxene-garnet solid solution equilibria in the systems Mg4Si4O12-Mg3Al2Si3O12 and Fe4Si4O12-Fe3Al2Si3O12 at high pressures and temperatures, Phys.

- defects are introduced into the pyropestructure as a hydrogarnet component where (O_4H_4)

A high-titanium containing garnet, SiO2(40.6), TiO2(6.3), Al2O3(18.8), MgO(14.3), CaO(20.21), (wt%) has been synthesized at 10 GPa and 1500°C. Unit cell parameter of this synthetic garnet is determined to be 11.812 Å by micro-focused X-ray diffractmetry and this value is intermediate between those of pyrope and grossular. These results indicate that pyrope-grossular garnet potentially can accommodate TiO2 up to 6.3 wt% at the high of 10 GPa.

Synthesis of high-TiO 2 pyrope-grossular garnet at 10 GPa

Akimoto, Hydrostatic compression of synthetic garnets pyrope and almandine, J.

()The garnet solid solution series between pyrope Mg 3Al2Si 3O 12 and knorringite Mg3Cr 2Si 3O 12 has beensynthesized from oxide mixtures at pressures of 60-80 kbars and1400-1500°C.

The data obtained clearly reveal that at P=2.5 GPa and T>=1100°C, mixed pyrope - grossular garnets are stable only for end-members rich compositions, the extent of solid solution between grossular and pyrope appearing to be greater on the Mg-rich side in accordance with the experimental data obtained at 3 GPa.

Synthesis of pyrope-knorringite solid solution series, Earth and ..

The compressibility of perovskites synthesized from compositions along the pyrope–almandine join is not strongly sensitive to Fe-content.

T1 - The cubic-tetragonal phase transition in the system majorite (Mg4Si4O12) - Pyrope (Mg3Al2Si3O12), and garnet symmetry in the Earth's transition zone

In the IR spectrum of a V4+-bearing pyrope the samenumber of OH--stretching bands is observed, suggesting that highercharged cations cause additional OH- substitutions and increasedOH- concentrations in garnet.

Akimoto, Pyroxene-garnet transformation: thermochemistry and elasticity of garnet solid solutions, and application to a pyrolite mantle, In: M.
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Regional Centre of Advanced Technologies and Materials

Although extra metallic Ti was included in the synthesis of Ti-bearing pyropes, only Ti4+ and no measurable Ti3+ could be stabilised on the octahedral site.

Researche institute in Czech Republic focuses on nanotechnology

Garnets along the join Mg4Si4O12 (majorite end member) - Mg3Al2Si3O12 (pyrope) synthesized at 2000°C, 19 GPa are, after quench, tetragonal in the compositional range up to 20 mol% pyrope, but cubic at higher Al contents. Lattice constants atet and atet in the tetragonal compositional range converge with increasing pyrope contents towards the lattice constant of the cubic garnets. The elastic strain and the intensity of the (222) reflection as a function of composition indicate a second-order phase transition near 20 mol% pyrope. From the wedge-like shape of pseudomerohedral twins and their interaction near 90° twin-boundary corners, as well as from the absence of growth-induced dislocations, it is concluded that the Al-poor garnets are also cubic at synthesis conditions but invert by (Mg,Si) ordering on the octahedral sites into tetragonal phases of space group I41/a upon quench. This implies that the cubic-to-tetragonal phase transition in Mg4Si4O12 garnet occurs below 2000°C at 19 GPa and at even lower temperatures in more aluminous compositions. A composition-dependent Landau model is consistent with a direct transformation from Ia3d to I41/a. Comparison of the T-X stability field of majorite-pyrope garnets with the chemistry of majorite-rich garnets expected to occur in the Earth's transition zone shows that the latter will be cubic under all conditions. Softening of elastic constants, which commonly accompanies ferroelastic phase transitions, may affect the seismic velocities of garnets in the deeper transition zone where majorite contents are highest.

Masaki Akaogi's Home Page in English - 学習院

The IR spectra of most natural pyrope-richgarnets appear to be different from those of the synthetics, which suggeststhat they are not characterised by the hydrogarnet substitution.

Seventh RISC-V Workshop: Day One · lowRISC

N2 - Garnets along the join Mg4Si4O12 (majorite end member) - Mg3Al2Si3O12 (pyrope) synthesized at 2000°C, 19 GPa are, after quench, tetragonal in the compositional range up to 20 mol% pyrope, but cubic at higher Al contents. Lattice constants atet and atet in the tetragonal compositional range converge with increasing pyrope contents towards the lattice constant of the cubic garnets. The elastic strain and the intensity of the (222) reflection as a function of composition indicate a second-order phase transition near 20 mol% pyrope. From the wedge-like shape of pseudomerohedral twins and their interaction near 90° twin-boundary corners, as well as from the absence of growth-induced dislocations, it is concluded that the Al-poor garnets are also cubic at synthesis conditions but invert by (Mg,Si) ordering on the octahedral sites into tetragonal phases of space group I41/a upon quench. This implies that the cubic-to-tetragonal phase transition in Mg4Si4O12 garnet occurs below 2000°C at 19 GPa and at even lower temperatures in more aluminous compositions. A composition-dependent Landau model is consistent with a direct transformation from Ia3d to I41/a. Comparison of the T-X stability field of majorite-pyrope garnets with the chemistry of majorite-rich garnets expected to occur in the Earth's transition zone shows that the latter will be cubic under all conditions. Softening of elastic constants, which commonly accompanies ferroelastic phase transitions, may affect the seismic velocities of garnets in the deeper transition zone where majorite contents are highest.

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