Quantitative determination of the cubic, tetragonal and monoclinic phases in partially stabilized zirconias by Raman spectroscopy

Kontoyannis, Christos G.; Orkoula, Malvina

doi:10.1007/bf01171541

Cited by 112 publications

(54 citation statements)

References 10 publications

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“…A Raman microprobe (Model T64000, Instruments S.A.) was used to determine the structure of the ZrO 2 by focusing on the thin layer through one of the transparent, cubic ZrO 2 single crystals. It is well known 20,21 that Raman spectra from cubic ZrO 2 are much weaker than those from both the tetragonal and monoclinic phases. The Raman microscope was also used to determine the ZrO 2 phase at the surface of the thin layers for a selected number of laminates.…”

Section: June 1999 Zro 2 /Zro 2 Layered Composites For Crack Bifurcationmentioning

confidence: 99%

ZrO₂/ZrO₂ Layered Composites for Crack Bifurcation

Sánchez-Herencia

Pascual

et al. 1999

Journal of the American Ceramic Society

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Section: June 1999 Zro 2 /Zro 2 Layered Composites For Crack Bifurcationmentioning

confidence: 99%

ZrO₂/ZrO₂ Layered Composites for Crack Bifurcation

Sánchez-Herencia

Pascual

et al. 1999

Journal of the American Ceramic Society

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“…The broad bands at 629 and 695 cm À1 and a high '' background '' profile indicate the existence of the cubic phase. 30 The absence of a sharp, well-defined band and the presence of the distorted profile have been attributed to structural disorder. 29 It is possible that the distortion of the spectrum is associated with the transition state from tetragonal to cubic zirconia after calcination at 500 C. The spectra hardly change for the sample calcined at temperatures up to 800…”

Section: Preparation Ofmentioning

confidence: 99%

Phase transformation in the surface region of zirconia and doped zirconia detected by UV Raman spectroscopy

Feng

Ying

et al. 2003

Phys. Chem. Chem. Phys.

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The phase evolution of yttrium oxide and lanthanum oxide doped zirconia (Y 2 O 3 -ZrO 2 and La 2 O 3 -ZrO 2 , respectively) from their tetragonal to monoclinic phase has been studied using UV Raman spectroscopy, visible Raman spectroscopy and XRD. UV Raman spectroscopy is found to be more sensitive at the surface region while visible Raman spectroscopy and XRD mainly give the bulk information. For Y 2 O 3 -ZrO 2 and La 2 O 3 -ZrO 2 , the transformation of the bulk phase from the tetragonal to the monoclinic is significantly retarded by the presence of yttrium oxide and lanthanum oxide. However, the tetragonal phase in the surface region is difficult to stabilize, particularly when the stabilizer 's content is low. The phase in the surface region can be more effectively stabilized by lanthanum oxide than yttrium oxide even though zirconia seemed to provide more enrichment in the surface region of the La 2 O 3 -ZrO 2 sample than the Y 2 O 3 -ZrO 2 sample, based on XPS analysis. The surface structural tension and the enrichment of the ZrO 2 component in the surface region of ZrO 2 -Y 2 O 3 and ZrO 2 -La 2 O 3 might be the reasons for the striking difference between the phase change in the surface region and the bulk. Accordingly, the stabilized tetragonal surface region can significantly prevent the phase transition from developing into the bulk when the stabilizer 's content is high.

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“…24 The Raman spectra for all the investigated compositions after heat treatment at 1200 ºC and the spectrum for …”

Section: Raman Spectramentioning

confidence: 99%

Tetragonal to Cubic Transformation of SiO₂-Stabilized ZrO₂ Polymorph through Dysprosium Substitutions

2017

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Partially stabilized tetragonal zirconia (t-ZrO2) is of particular interest for hard tissue replacements. Ageing related failures of the ceramic associated with the gradual transformation from t-ZrO2 to m-ZrO2 (monoclinic zirconia) can lead to its premature removal from the implant site. In addition, monitoring the satisfactory performance of the implant throughout its life span without invasive techniques is a challenging task. The magnetic resonance imaging (MRI) contrast ability of dysprosium (Dy 3+ ) is well established. To this aim, varied levels of Dy 3+ additions in the ZrO2-SiO2 binary oxide system have been explored. The results indicate the effective role of Dy 3+ in the formation of thermally and mechanically stable c-ZrO2 (cubic zirconia) phase at higher temperatures. The presence of SiO2 influenced the t-ZrO2 stabilization whereas Dy 3+ tends to occupy the ZrO2 lattice sites to induce c-ZrO2 transition. Magnetic and magnetic resonance imaging (MRI) tests displayed the commendable contrast ability of Dy 3+ stabilized ZrO2-SiO2 binary systems. Nanoindentation results demonstrate a remarkable enhancement on the mechanical properties.Keywords: Silica; Zirconia; Dysprosium; Stabilization; Mechanical. 3 IntroductionThe demand for bone implants is growing rapidly due to the increasing incidents of trauma and age related defects caused by osteoporosis. In view of the above potential advantages of Dy 3+ as an addition to ZrO2-SiO2 binary oxides in terms of increased t-ZrO2 stability and enhance MRI image contrast, we present a study of the influence of Dy 3+ on the ZrO2-SiO2 binary oxide system through in-situ sol-gel synthesis, followed by a systematic analysis of the resulting phase composition and structure, mechanical strength and imaging contrast features. Materials and Methods Powder synthesisThe synthesis of Dy 3+ doped ZrO2-SiO2 (DZS) binary oxides was achieved through the sol-gel method. Analytical grade Dy(NO3)3.H2O, ZrOCl2·8H2O and (C2H5)4OSi (TEOS), all procured from Sigma-Aldrich, India, were taken as precursors for the synthesis. The molar concentrations of ZrOCl2·8H2O and (C2H5)4OSi were maintained at a constant ratio of 1: 1 throughout the 5 synthesis whereas the Dy(NO3)3 additions were adjusted to obtain a wide range of compositions.Additionally, a pure ZrO2-SiO2 binary with 1:1 molar ratio was prepared for comparative purposes. The molar concentrations of the different precursors and the respective sample codes are reported in Table 1; the same codes will be used throughout the manuscript. The synthetic procedure is briefly explained as follows. Previously prepared Dy(NO3)3 stock solution as detailed in Table 1 was added to the ZrOCl2 solution under vigorous stirring. The required amount of ethanol was added to this continuously stirred mixture at an operating temperature of 80 °C for 30 minutes. This was followed by the addition of 1 M TEOS to the solution under constant stirring conditions and finally 0.1 M of HNO3 was added to this mixture as a catalyst. The homogeneous solut...

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Quantitative determination of the cubic, tetragonal and monoclinic phases in partially stabilized zirconias by Raman spectroscopy

Cited by 112 publications

References 10 publications

ZrO₂/ZrO₂ Layered Composites for Crack Bifurcation

ZrO₂/ZrO₂ Layered Composites for Crack Bifurcation

Phase transformation in the surface region of zirconia and doped zirconia detected by UV Raman spectroscopy

Tetragonal to Cubic Transformation of SiO₂-Stabilized ZrO₂ Polymorph through Dysprosium Substitutions

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Quantitative determination of the cubic, tetragonal and monoclinic phases in partially stabilized zirconias by Raman spectroscopy

Cited by 112 publications

References 10 publications

ZrO2/ZrO2 Layered Composites for Crack Bifurcation

ZrO2/ZrO2 Layered Composites for Crack Bifurcation

Phase transformation in the surface region of zirconia and doped zirconia detected by UV Raman spectroscopy

Tetragonal to Cubic Transformation of SiO2-Stabilized ZrO2 Polymorph through Dysprosium Substitutions

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Product

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ZrO₂/ZrO₂ Layered Composites for Crack Bifurcation

ZrO₂/ZrO₂ Layered Composites for Crack Bifurcation

Tetragonal to Cubic Transformation of SiO₂-Stabilized ZrO₂ Polymorph through Dysprosium Substitutions