SCANDIA STABIILIZED ZIRCONIA MATERIALS CODOPED WITH Gd, Ho AND Yb. NITRIDATION AND STABILITY
DOI:
https://doi.org/10.5281/zenodo.8217778Abstract
The cubic and rombohedral structures of scandia stabilized-zirconia (ScSZ) co-doped with the rare earth ions Gd, Ho, and Yb were determined. The cubic fluorite structures obtained for Gd<sup>+3</sup> and Ho<sup>+3</sup> co-doped ScSZ have lattice constants of a = 508.88(0.02) pm and a = 508.52(0.01) pm respectively. Due to the ionic radii of Gd<sup>3</sup> (97 pm) and Ho<sup>3</sup> (91 pm), the lattice constant for the Gd compound is slightly larger than the Ho doped compound. For the ytterbium (86.8 pm) co-doped ScSZ, the rhomboedral ( R3) fluorite related superstructure the following cell parameters a = 953.58 (0.03) pm and c = 1747.12(0.06) pm were found: After the nitridation under NH3 for 24 h at 1200<sup>°</sup>C, all 3 compounds exhibit a deficient rock salt structure with cell parameters: a = 454.18(0.03) pm for Gd<sup>+3</sup>, a = 454.59(0.01) pm for Ho<sup>+3</sup> and a = 454.26(0.02) pm for Yb <sup>+3</sup> . The decomposition of all these nitrides was investigated with thermal analysis. It was found that the reoxidation process is diffusion controlled.Downloads
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Published
2017-04-22
How to Cite
Martínez, N. J., Schweda, E., Seijas, C., Mijares, J. J., & Cordero, F. (2017). SCANDIA STABIILIZED ZIRCONIA MATERIALS CODOPED WITH Gd, Ho AND Yb. NITRIDATION AND STABILITY. LatinAmerican Journal of Metallurgy and Materials, 250–257. https://doi.org/10.5281/zenodo.8217778
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