Zirconia-13 mol % calcia solid solution synthesis by the polymerized complex and coprecipitation routes

Yashima, Masatomo; Ohtake, Katsuya; Kakihana, Masato; Yoshimura, Masahiro

doi:10.1007/bf00626510

Cited by 21 publications

(10 citation statements)

References 9 publications

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“…The CZ nanopowders were prepared using via a modified reverse‐strike co‐precipitation synthesis route . Calcium nitrate tetrahydrate (99%; Alfa Aesar, Ward Hill, MA) and Zirconium nitrate hydrate (Sigma‐Aldrich, Technical Grade, St. Louis, MO) were dissolved in deionized water to produce a dilute and clear solution.…”

Section: Experimental Methodsmentioning

confidence: 99%

Phase Stability in Calcia‐Doped Zirconia Nanocrystals

Drazin

Castro

2016

J. Am. Ceram. Soc.

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Calcia-doped zirconia exhibits all of the polymorphism seen in the yttria-doped zirconia ceramics, but can be produced at lowered costs and in greater abundance due to the accessibility of Calcium precursors in comparison to Yttrium. Although with great challenges, there exists an opportunity to replace yttria with calcia in applications such as ionic conductors where phase stability is critical. There is a dearth of surface characterization to enable design and prediction of the polymorphism in nanoparticulate calcia-zirconia. With recent advances in water adsorption microcalorimetry, one can accurately probe surface energies of the four zirconia polymorphs: monoclinic, tetragonal, cubic, and amorphous. The surface energies can then be coupled with bulk enthalpies extracted from oxide melt drop solution calorimetry to create a nanocrystalline phase stability diagram similar to its bulk counterpart. We report here the surface and bulk thermodynamic data on polymorphs of calcia-zirconia with composition ranging from 0 to 20 mol% calcia and use it to build a nanophase diagram for this system. The effect of the humidity in the phase stability diagram trends is also addressed and demonstrated to minimize the effect of the surface energies in the overall polymorphism trends.

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Section: Experimental Methodsmentioning

confidence: 99%

Phase Stability in Calcia‐Doped Zirconia Nanocrystals

Drazin

Castro

2016

J. Am. Ceram. Soc.

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“…10,18,26 It is important to notice the doublets around 1500 cm 21 in both Raman and FT-IR spectra, which could be assigned to acetate ligands. [22][23][24] The 110 -150 cm 21 separation in frequency between the v asym (COO) at 1560 cm 21 and v sym (COO) at 1410-1450 cm 21 suggests that CH 3 COO acts as bidentate ligands:…”

Section: A Structure Of Precursors (Hafnia and Zirconia Gels)mentioning

confidence: 97%

Crystallization of hafnia and zirconia during the pyrolysis of acetate gels

et al. 1997

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Hafnia and zirconia gels were prepared by drying hafnyl or zirconyl acetate solutions. Hafnia and zirconia gels contain both hydroxyl group and bidentate acetates which are directly bonded to the metal ions. Thermal decomposition and crystallization behavior of the gels were investigated through XRD, FT-IR, and TEM. Hafnium-containing gels crystallized directly into stable monoclinic hafnia around 500-540 ± C, while zirconium-containing gels first formed metastable tetragonal zirconia around 450 ± C. The dissimilar crystallization behavior of the gels into metastable, tetragonal zirconia or into stable, monoclinic hafnia can be explained through the difference in free-energy changes of the tetragonal-to-monoclinic phase transformation.

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“…Preparing a fine and an agglomerate free zirconia powder is the first and perhaps the most important step in obtaining a sintered zirconia ceramic of desirable microstructure and therefore mechanical properties. Various chemistry-based novel approaches have been taken for the preparation of zirconia powders including co-precipitation, hydrothermal, sol gel, sonochemical method, microemulsion and thermal decomposition processing (Ma et al, 2004;Wu et al, 2003;Lee et al, 1999;Tai et al, 2001;Djuricic et al, 1995;Bourell and Kaysser, 1993;Ward and Ko, 1993;Huang and Guo, 1992;Fang et al, 1997;Li et al, 1989;Juarez et al, 2000;Yashima et al, 1996;Yashima et al, 1994;Caruso et al, 1997;Chatterjee et al, 1992;Dodd and McCormick, 2002;Roy and Ghose, 2000;Kolen'ko et al, 2003;Noh et al, 2003;Somiya and Akiba, 1999;Piticescu et al, 2001). The chemical precipitation (CP) method is a suitable low cost technique for the mass production compared with the other mentioned technique.…”

Section: Introductionmentioning

confidence: 97%