KIM, DJ BECHER, PF HUBBARD, CR 2024-01-21T22:14:00Z 2024-01-21T22:14:00Z 2022-01-10 1993-11 0002-7820 https://pubs.kist.re.kr/handle/201004/145961 Tetragonal ZrO2 (t-ZrO2) solid solutions were prepared with additions of 2 mol% Y2O3 plus up to 0.45 mol% Nb2O5. The thermal expansion coefficients in both the a- and c-axis lattice directions increased with Nb2O5 alloying and the thermal expansion in the c-axis direction was greater than that in the a-axis direction over the entire composition range. This anisotropic thermal expansion behavior was related to the 4-fold coordination of Nb5+ with oxygen ions in t-ZrO2, solid solutions in the system ZrO2-Y2O3-Nb2O5. The fracture toughness continuously increased with Nb2O5 alloying and suggested that the c/a axial ratio is a more significant factor than the internal stress that arises from the thermal expansion anisotropy, in the determination of the transformability of t-ZrO2 in this system. English AMER CERAMIC SOC MARTENSITIC-TRANSFORMATION FRACTURE-TOUGHNESS ZIRCONIA TEMPERATURE EFFECT OF NB2O5 ALLOYING ON THERMAL-EXPANSION ANISOTROPY OF 2 MOL-PERCENT Y2O3-STABILIZED TETRAGONAL ZRO2 Article 10.1111/j.1151-2916.1993.tb04035.x 1 JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.76, no.11, pp.2904 - 2908 JOURNAL OF THE AMERICAN CERAMIC SOCIETY 76 11 2904 2908 scie scopus A1993MG31900029 2-s2.0-0027702291 Materials Science, Ceramics Materials Science Article MARTENSITIC-TRANSFORMATION FRACTURE-TOUGHNESS ZIRCONIA TEMPERATURE zirconia thermal expansion anisotropy