INVESTIGADORES
ACUÑA Leandro Marcelo
artículos
Título:
Crystal structure and local order of nanocrystalline zirconia-based solid solutions
Autor/es:
I. O. FÁBREGAS, D. G. LAMAS, L. M. ACUÑA, N. E. WALSÖE DE RECA, A. F. CRAIEVICH, M. C. A. FANTINI AND R. J. PRADO
Revista:
POWDER DIFFRACTION
Editorial:
J C P D S-INT CENTRE DIFFRACTION DATA
Referencias:
Año: 2008 vol. 23 p. 46 - 55
ISSN:
0885-7156
Resumen:
Crystal and local structures long- and short-range order, respectively of four nanocrystalline
zirconia-based solid solutionsZrO2-6 and 16 mol % CaO and ZrO2-2.8 and 12 mol %
Y2O3synthesized by a pH-controlled nitrate-glycine gel-combustion process were studied. These
materials were characterized by synchrotron X-ray diffraction XRD and extended X-ray
absorption fine structure EXAFS spectroscopy. Our XRD results indicate that the solid solution
with low CaO and Y2O3 contents 6 and 2.8 mol %, respectively exhibit a tetragonal
crystallographic lattice, and those with higher CaO and Y2O3 contents 16 and 12 mol %,
respectively have a cubic lattice. Moreover, our EXAFS study demonstrates that the
tetragonal-to-cubic phase transitions, for increasing CaO and Y2O3 contents, are both related to
variations in the local symmetry of the ZrO first neighbor coordination spherelong- and short-range order, respectively of four nanocrystalline
zirconia-based solid solutionsZrO2-6 and 16 mol % CaO and ZrO2-2.8 and 12 mol %
Y2O3synthesized by a pH-controlled nitrate-glycine gel-combustion process were studied. These
materials were characterized by synchrotron X-ray diffraction XRD and extended X-ray
absorption fine structure EXAFS spectroscopy. Our XRD results indicate that the solid solution
with low CaO and Y2O3 contents 6 and 2.8 mol %, respectively exhibit a tetragonal
crystallographic lattice, and those with higher CaO and Y2O3 contents 16 and 12 mol %,
respectively have a cubic lattice. Moreover, our EXAFS study demonstrates that the
tetragonal-to-cubic phase transitions, for increasing CaO and Y2O3 contents, are both related to
variations in the local symmetry of the ZrO first neighbor coordination sphere2-6 and 16 mol % CaO and ZrO2-2.8 and 12 mol %
Y2O3synthesized by a pH-controlled nitrate-glycine gel-combustion process were studied. These
materials were characterized by synchrotron X-ray diffraction XRD and extended X-ray
absorption fine structure EXAFS spectroscopy. Our XRD results indicate that the solid solution
with low CaO and Y2O3 contents 6 and 2.8 mol %, respectively exhibit a tetragonal
crystallographic lattice, and those with higher CaO and Y2O3 contents 16 and 12 mol %,
respectively have a cubic lattice. Moreover, our EXAFS study demonstrates that the
tetragonal-to-cubic phase transitions, for increasing CaO and Y2O3 contents, are both related to
variations in the local symmetry of the ZrO first neighbor coordination sphere2O3synthesized by a pH-controlled nitrate-glycine gel-combustion process were studied. These
materials were characterized by synchrotron X-ray diffraction XRD and extended X-ray
absorption fine structure EXAFS spectroscopy. Our XRD results indicate that the solid solution
with low CaO and Y2O3 contents 6 and 2.8 mol %, respectively exhibit a tetragonal
crystallographic lattice, and those with higher CaO and Y2O3 contents 16 and 12 mol %,
respectively have a cubic lattice. Moreover, our EXAFS study demonstrates that the
tetragonal-to-cubic phase transitions, for increasing CaO and Y2O3 contents, are both related to
variations in the local symmetry of the ZrO first neighbor coordination sphereXRD and extended X-ray
absorption fine structure EXAFS spectroscopy. Our XRD results indicate that the solid solution
with low CaO and Y2O3 contents 6 and 2.8 mol %, respectively exhibit a tetragonal
crystallographic lattice, and those with higher CaO and Y2O3 contents 16 and 12 mol %,
respectively have a cubic lattice. Moreover, our EXAFS study demonstrates that the
tetragonal-to-cubic phase transitions, for increasing CaO and Y2O3 contents, are both related to
variations in the local symmetry of the ZrO first neighbor coordination sphereEXAFS spectroscopy. Our XRD results indicate that the solid solution
with low CaO and Y2O3 contents 6 and 2.8 mol %, respectively exhibit a tetragonal
crystallographic lattice, and those with higher CaO and Y2O3 contents 16 and 12 mol %,
respectively have a cubic lattice. Moreover, our EXAFS study demonstrates that the
tetragonal-to-cubic phase transitions, for increasing CaO and Y2O3 contents, are both related to
variations in the local symmetry of the ZrO first neighbor coordination sphere2O3 contents 6 and 2.8 mol %, respectively exhibit a tetragonal
crystallographic lattice, and those with higher CaO and Y2O3 contents 16 and 12 mol %,
respectively have a cubic lattice. Moreover, our EXAFS study demonstrates that the
tetragonal-to-cubic phase transitions, for increasing CaO and Y2O3 contents, are both related to
variations in the local symmetry of the ZrO first neighbor coordination sphere2O3 contents 16 and 12 mol %,
respectively have a cubic lattice. Moreover, our EXAFS study demonstrates that the
tetragonal-to-cubic phase transitions, for increasing CaO and Y2O3 contents, are both related to
variations in the local symmetry of the ZrO first neighbor coordination sphere have a cubic lattice. Moreover, our EXAFS study demonstrates that the
tetragonal-to-cubic phase transitions, for increasing CaO and Y2O3 contents, are both related to
variations in the local symmetry of the ZrO first neighbor coordination sphere2O3 contents, are both related to
variations in the local symmetry of the ZrO first neighbor coordination sphere