high pressure corundum

  • High-pressure synthesis and local structure of corundum ...

    The corundum-type In 2-2x Zn x Sn x O 3 solid solution (cor-ZITO, x ≤ 0.7) was synthesized at 1000 °C under a high pressure of 70 kbar. cor-ZITO is a high-pressure polymorph of the transparent conducting oxide bixbyite-In 2-2x Zn x Sn x O 3 (x ≤ 0.4). Analysis of the extended X-ray absorption fine structure suggests that significant face-sharing of Zn and Sn octahedra occurs, as expected ...

  • RUBY & SAPPHIRE

    Ruby and sapphire (known to mineralogists as corundum) are 'aluminum oxides' that have been subjected to very high-pressure and temperature in the geological past equivalent to what geologists refer to as 'amphibolite facies metamorphism'.Sometimes the corundum has beautiful color, other times it may have good transparency to yield ruby and sapphire gemstones.

  • Pbca-Type In O : The High-Pressure Post-Corundum phase .

    On further decrease of pressure, we observed a phase transition to the metastable corundum-type In 2 O 3 near room conditions. Recompression of the metastable corundum-type In 2 O 3 at room temperature leads to a transition to the Rh 2 O 3−III phase, thus showing that the Rh 2 O 3−III phase is the post-corundum phase at room temperature.

  • Ruby under pressure: High Pressure Research: Vol 28, No 2

    The ruby luminescence method is widely used for pressure measurement in the diamond anvil cell and other optically transparent pressure cells. With this application in mind, we briefly review the ground-state physical properties of corundum (α-Al2O3) with some emphasis on its behavior under high pressure, survey the effects of temperature and stress on the R-line luminescence of ruby (Cr ...

  • Neoarchean high-pressure margarite–phengitic muscovite ...

    Neoarchean high-pressure margarite–phengitic muscovite–chlorite corona mantled corundum in quartz-free high-Mg, Al phlogopite–chlorite schists from the Bundelkhand craton, north central India

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  • Origin of peraluminous minerals (corundum, spinel, and ...

    Origin of peraluminous minerals (corundum, spinel, and sapphirine) in a highly calcic anorthosite from the Sittampundi Layered Complex, Tamil Nadu, India ... permeated the rock and the assemblage corundum + amphibole + anorthite + clinozoisite was stabilized during high-pressure (HP) metamorphism (11 ± 2 kbar, 750 ... Zheng JP (2004) Ultrahigh ...

  • Minerals | Free Full-Text | Gem Corundum Deposits of ...

    The solubility of corundum in H 2 O at high pressure and temperature and its implications for Al mobility in the deep crust and upper mantle. Chem. Geol. 2007, 240, 54–60.

  • High-Pressure Synthesis and Local Structure of Corundum ...

    High-Pressure Synthesis and Local Structure of Corundum-Type In 2-2xZn xSn xO 3 (x e 0.7) Cathleen A. Hoel,† Jose´ Manuel Gallardo Amores,‡ Emilio Mora´n,‡ Miguel Angel A´lario-Franco,‡ Jean-Franc¸ois Gaillard,§ and Kenneth R. Poeppelmeier*,† Department of Chemistry and Department of CiVil and EnVironmental Engineering, Northwestern UniVersity, 2145 Sheridan Road, EVanston ...

  • HIGH-PRESSURE TRANSFORMATIONS OF CORUNDUM-TYPE TRANSITION ...

    The majority of trivalent TM oxides crystallizes in the hexagonal corundum structure (Cox 1995). The substances assuming this structure type include Fe2O3, Co2O3, Cr2O3, Rh2O3, and Ti2O3, among others. The behavior of corundum-type oxide structures at higher pressure has attracted a significant deal of attention over the years.

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  • Pbca-Type In O : The High-Pressure Post-Corundum phase .

    On further decrease of pressure, we observed a phase transition to the metastable corundum-type In 2 O 3 near room conditions. Recompression of the metastable corundum-type In 2 O 3 at room temperature leads to a transition to the Rh 2 O 3−III phase, thus showing that the Rh 2 O 3−III phase is the post-corundum phase at room temperature.

  • Synthesis and High-Pressure Study of Corundum-Type In

    ABSTRACT: This work reports the high-pressure and high-temperature (HP-HT) synthesis of pure rhombohedral (corundum-type) phase of indium oxide (In 2 O 3) from its most stable polymorph, cubic bixbyite-type In 2 O 3, using a anvil press. Structural and vibrational properties of corundum-type In 2 O 3 (rh-In 2 O 3) have been

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  • Structural and vibrational properties of corundum-type ...

    Rhombohedral corundum-type (SG R-3c, N.167,Z = 6) In 2O 3 is also known to be a metastable phase at room condi-tions that can be obtained after high pressure (HP)-high temperature (HT) treatment, but also at room pressure [16–40]. Modern calculations of pure and doped rhombohedral In 2O 3 (rh-In 2O 3), suggest that this phase could be even ...

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  • Lab-Created Sapphire vs Natural Sapphire - Difference Between

    Jun 28, 2018 · A lab created sapphire has all the high-quality characteristics of the natural gem and is more flawless with hardly any imperfections. The sapphire is made by simulating the earth's heat and high-pressure effects on corundum. This process creates a very hard and durable gem which does not easily scratch or chip.

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  • Origin of peraluminous minerals (corundum, spinel, and ...

    Origin of peraluminous minerals (corundum, spinel, and sapphirine) in a highly calcic anorthosite from the Sittampundi Layered Complex, Tamil Nadu, India ... permeated the rock and the assemblage corundum + amphibole + anorthite + clinozoisite was stabilized during high-pressure (HP) metamorphism (11 ± 2 kbar, 750 ... Zheng JP (2004) Ultrahigh ...

  • Pressure-volume-temperature behavior of diaspore and ...

    The lattice parameters of synthetic diaspore (AlO(OH)) and synthetic and natural corundum (Al 2 O 3) have been measured at simultaneously elevated pressure and temperature up to 7 GPa and 800°C (1000°C for corundum) using a MAX 80 cubic anvil high-pressure apparatus. Several experimental runs were carried out for both minerals, in which the ...