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Sm(2-x)Dy(x)Zr2O7 pyrochlores: probing order-disorder dynamics and multifunctionality.

Farheen N Sayed¹, V Grover, K Bhattacharyya

¹Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India.

Inorganic Chemistry

|March 2, 2011

Summary

This study synthesizes Sm(2-x)Dy(x)Zr(2)O(7) compounds, revealing tunable band gaps and high photocatalytic activity for xylenol orange degradation. The research highlights structural phase transitions and ionic conductivity changes with Dy(3+) doping.

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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Area of Science:

Materials Science
Solid State Chemistry
Nanotechnology

Background:

The synthesis and characterization of rare-earth zirconate pyrochlores are crucial for advanced material applications.
Understanding structure-property relationships in Sm2Zr2O7 and Dy2Zr2O7 systems is key for optimizing their performance.

Purpose of the Study:

To synthesize Sm(2-x)Dy(x)Zr(2)O(7) compounds using a gel combustion method.
To investigate the structural, optical, and ionic conductivity properties of these doped zirconates.
To explore their potential as photocatalysts for organic pollutant degradation.

Main Methods:

Controlled gel combustion synthesis of Sm(2-x)Dy(x)Zr(2)O(7) powders.
Characterization using powder X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and UV-Vis spectroscopy.
Ionic conductivity measurements and first-principles calculations.

Main Results:

Single-phase pyrochlore structure observed up to 40 mol% Dy(3+), transitioning to a defect fluorite structure.
Raman spectroscopy indicated pyrochlore ordering throughout the composition range, contradicting XRD findings for Dy2Zr2O7.
Ionic conductivity increased with Dy(3+) content, accompanied by higher activation energy due to disorder.
Tunable band gap observed, decreasing with increasing Dy(3+) concentration, supported by theoretical calculations.
Demonstrated high photocatalytic activity for xylenol orange degradation, with efficiency increasing from Sm2Zr2O7 to Dy2Zr2O7.

Conclusions:

The study successfully synthesized Sm(2-x)Dy(x)Zr(2)O(7) compounds with tunable properties.
Structural analysis revealed a phase transition from pyrochlore to defect fluorite, with Raman spectroscopy offering complementary insights.
The materials exhibit promising potential as efficient photocatalysts, particularly Dy-rich compositions.