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Global Journal of Physical Chemistry. Volume 2, Issue 2 (2011) pp. 170-175
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Research Article
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Free Article
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Plastic deformation and nonstoichiometry in rutile TiO2
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A. Mebarek, A. Lemmoui, M. Beccouche
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Laboratoire de métallurgie physique et propriétés des matériauxUniversité de Annaba-Département de Métallurgie et Génie des Matériaux, Sidi Amar, 23000 Annaba, Algérie
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Abstract |
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The aim of this work is to study plastic deformation of sub-stoichiometric rutile TiO2-x (x ? [ 0 ; 34×10-4 ] and at a temperature of 1050°C). For this purpose, a rig allowing deformation under compression at high temperature and controlled reducing atmosphere, has been used. In order to preserve to ambiant temperature, the obtained samples microstructures at high temperature, a quenching system under secondary vacuum, was set up. Observation of TiO2-x quenched samples under transmission electronic microscope, has confirmed the efficiency of our quenching system and that these structures can be analysed as solid solution of intrinsic punctual defects. Precipitates of Fe2Tin-202n-2 type in the shape of plates perpendicular to [1 0 0 ] directions and appearing at low temperature could be observed in these compounds. Plastic deformation of TiO2-x monocrystals have given: - For a compression with compression axis at 45° from the [001] direction, it has been noted an important hardening for increasing x values. In this case the deformation is controlled by the majority specific defect interstitial titanium. The activated slip system is of {101} < i 01> type. - For a compression according to [111] direction, it has been observed an important softening of sub-stoechiometric rutile compared to TiO2. The activated slip system is of {110} <001> type. Observation of reduced then deformed samples under transmission electronic microscope has shown plans defects presence of {132} type. These defects appear during the cooling of the sample and are supported by the presence of network dislocations introduced by plastic deformation.
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Keywords |
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Rutile; Deformation; Stoichiometry; Defects; Compression
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