Diffusion of Cobalt Ions into Crystals of Non-Stoichiometric Magnesium-Aluminate Spinel MgO·xAl2O3 |
| O.O. Vovk, S. Nizhankovskyi, Yu. Siryk, S. Skorik, P. Mateichenko
Institute for Single Crystals NAS of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine |
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| Magnesium-aluminate spinel crystals MgO·xAl2O3 have been grown by the horizontal directed crystallization method. The structure, phase and element composition of crystals were investigated using X-ray diffraction and scanning electron microscopy with a microanalysis system. The obtained MgO·xAl2O3 crystals have a spinel structure with 1≤x<2. The temperature stability of the spinel phase for different stoichiometry was established. Diffusion doping of magnesium-aluminate spinel crystals with cobalt ions through the gas phase using cobalt oxide as a diffusion source has been studied under the temperature treatment of 1300-1500°. It was found that the penetration depth of the cobalt ions into the crystal body significantly increases with the increase of x. The diffusion coefficients of cobalt into MgO·xAl2O3 (x=1.00) at 1300-1500° and the efficient activation energy were estimated. |
DOI:10.12693/APhysPolA.141.308 topics: MALO, non-stoichiometric magnesium-aluminate spinel, MgO·xAl2O3, cobalt diffusion |