INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
artículos
Título:
Synthesis and characterization of Ti-doped ZrSiO4 at ambient and high-pressure conditions
Autor/es:
F. GRINBLAT; V. BILOVOL; S. FERRARI; L. G. PAMPILLO
Revista:
JOURNAL OF MATERIALS SCIENCE
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2018 p. 1 - 9
ISSN:
0022-2461
Resumen:
We have successfully synthesized for the first time a Ti-doped ZrSiO4 powder (stoichiometry Zr0.95Ti0.05SiO4) via a sol?gel route. The structural and vibrational properties have been characterized by X-ray diffraction, electron microscopy and Raman spectroscopy. Zr0.95Ti0.05SiO4 has a tetragonal zircon-type structure with a = 6.5981(2) Å and c = 5.9810(2) Å. Eight of its Raman-active modes have been measured and assigned. We also performed high-pressure synchrotron X-ray diffraction experiments. The structural behavior was studied up to 31 GPa. At this pressure, we found evidence of the onset of a phase transition, coexisting the low-pressure polymorphs (zircon) with the typical high-pressure polymorph of ZrSiO4 (reidite-type). From the analysis of unit-cell volume versus pressure using a Birch?Murnaghan equation of state, in the quasi-hydrostatic pressure regime (P < 10.5 GPa), we have determined a bulk modulus of 297 GPa. This magnitude represents an enhancement of a 30% in the value of this parameter if compared with un-doped zircon-type ZrSiO4 (bulk modulus < 227 GPa). The low compressibility of Zr0.95Ti0.05SiO4 converts this compound in a very good candidate for many technological applications. The effect of pressure on the linear compressibility of the lattice parameters is also analyzed.