Crystal Structure of Orthorhombic Zirconia in Partially Stabilized Zirconia |
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Authors: | Erich H Kisi Christopher J Howard Roderick J Hill† |
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Affiliation: | Australian Nuclear Science and Technology Organization, Menai, New South Wales 2234, Australia;Mineralogisches Institut, Universität Würzburg, Am Hubland, D-8700 Würzburg, Federal Republic of Germany |
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Abstract: | A neutron powder diffraction investigation confirms that, in tough magnesiapartially-stabilized zirconia cooled to 30 K, most of the tetragonal zirconia transforms to an orthorhombic phase. This phase is retained on heating to room temperature; the lattice parameters at 295 K are a = 0.5068, b = 0.5260, and c = 0.5077 nm. The room-temperature crystal structure (space group Pbc21) is determined by multiphase Rietveld refinement from the neutron diffraction pattern. This orthorhombic structure is compared with the parent tetragonal structure and with the structure of monoclinic zirconia, which it closely resembles. |
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Keywords: | orthorhombic zirconia crystal structure partially stabilized zirconia neutron diffraction phase transformation |
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