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Valence Bond Theory02:42

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Related Experiment Video

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Structural Fluctuations in the spin-liquid state of Tb2Ti2O7.

J P C Ruff1, B D Gaulin, J P Castellan

  • 1Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.

Physical Review Letters
|February 1, 2008
PubMed
Summary

Structural correlations in the geometrically frustrated pyrochlore, Terbium Titanate (Tb2Ti2O7), were observed using x-ray scattering. These findings suggest fluctuations preceding a low-temperature phase transition.

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Crystallography

Background:

  • Terbium Titanate (Tb2Ti2O7) is a geometrically frustrated pyrochlore material.
  • It is known to exhibit a spin-liquid or cooperative paramagnetic state below ~20 K.

Purpose of the Study:

  • To investigate the structural correlations in single crystal Tb2Ti2O7 at low temperatures.
  • To understand the behavior of Tb2Ti2O7 near its magnetic ordering temperature.

Main Methods:

  • High-resolution x-ray scattering measurements were performed on single crystal Tb2Ti2O7.
  • Parametric studies focused on structural Bragg peaks within the Fd3[over ]m space group.

Main Results:

  • Finite structural correlations were observed at low temperatures.
  • Substantial peak broadening and intensity reduction occurred between 20 K and 300 mK.
  • An anomalous lattice expansion was noted below ~18 K.

Conclusions:

  • The observed structural changes are consistent with developing fluctuations.
  • These fluctuations precede a cooperative Jahn-Teller, cubic-tetragonal phase transition at very low temperatures.