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Related Experiment Videos

Phase transition in single crystal Cs2Nb4O11.

Jianjun Liu1, E P Kharitonova, Chun-Gang Duan

  • 1Department of Physics, University of Nebraska, Omaha, Nebraska 68182-0266, USA. jliu@unlserve.unl.edu

The Journal of Chemical Physics
|April 26, 2005
PubMed
Summary

A structural phase transition in cesium niobate (Cs2Nb4O11) was identified at 165°C, evidenced by anomalies in capacitance and Raman spectra, indicating a shift from Pnn2 to Imm2 symmetry.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Crystallography

Background:

  • Cesium niobate (Cs2Nb4O11) is a material with potential applications, but its phase transitions are not fully understood.
  • Understanding structural dynamics is crucial for predicting and controlling material properties.

Purpose of the Study:

  • To investigate the temperature-dependent phase transition in single crystal Cs2Nb4O11.
  • To elucidate the structural changes associated with observed anomalies in physical properties.

Main Methods:

  • Temperature-dependent complex capacitance and impedance measurements.
  • Polarized Raman spectroscopy across a range of temperatures.
  • Pseudosymmetry search of structure space group for crystallographic analysis.

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Main Results:

  • A sharp lambda-shaped peak in complex capacitance observed at 165°C.
  • Drastic changes in polarized Raman spectra correlated with the capacitance anomaly.
  • Structural transition identified from orthorhombic Pnn2 to orthorhombic Imm2 at 165°C.
  • Assignment of high-wavenumber Raman bands to internal vibrations of NbO6 octahedra and NbO4 tetrahedra.

Conclusions:

  • The study confirms a structural phase transition in Cs2Nb4O11 at 165°C.
  • The transition involves a change in crystal symmetry from Pnn2 to Imm2.
  • Raman spectroscopy provides insights into the vibrational modes of the niobate polyhedra during the transition.