X-ray diffraction study of compositionally homogeneous, nanocrystalline yttria-doped zirconia powders |
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Authors: | D G Lamas N E Walsöe De Reca |
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Affiliation: | (1) PRINSO (Programa de Investigaciones en Sólidos), CITEFA-CONICET, Zufriategui, 4380, (1603) Villa Martelli, Pcia. de Buenos Aires, Argentina;(2) PRINSO (Programa de Investigaciones en Sólidos), CITEFA-CONICET, Zufriategui, 4380, (1603) Villa Martelli, Pcia. de Buenos Aires, Argentina |
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Abstract: | The crystal structure of compositionally homogeneous, nanocrystalline ZrO2 - X mol% Y2O3 (X = 2.8, 4, 5, 6, 7, 8, 9, 10, 11, and 12) powders synthesized by a nitrate-citrate gel-combustion process has been studied by X-ray diffraction. By applying the Rietveld method, it was found that all the powders presented the tetragonal phase (P4
2/nmc space group). The axial ratio c/a
f
decreased with increasing Y2O3 content and became almost unity at 9 mol% Y2O3. However, powders in the compositional range of ZrO2 - 9 to 12 mol% Y2O3 exhibited the oxygen atoms displaced from their ideal sites of the cubic phase along the c axis, which is known as the t-form of the tetragonal phase. A conjunct analysis of crystallite size and microstrain of all the powders is also presented. |
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