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A Fluctuating State in the Framework Compounds (Ba,Sr)Al2O4.

Yui Ishii1, Hirofumi Tsukasaki1, Eri Tanaka1

  • 1Department of Materials Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan.

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|January 14, 2016
PubMed
Summary
This summary is machine-generated.

Structural fluctuations in hexagonal Barium Strontium Aluminate (Ba(1-x)Sr(x)Al2O4) were studied. Sr-substitution suppresses transition temperatures and suggests new quantum criticality due to soft modes.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystallography

Background:

  • Hexagonal BaAl2O4 exhibits a corner-sharing AlO4 tetrahedral network.
  • Structural fluctuations are key to understanding framework compound properties.

Purpose of the Study:

  • To characterize structural fluctuations in hexagonal Ba(1-x)Sr(x)Al2O4.
  • To investigate the effect of Sr-substitution on structural phase transitions.
  • To explore the potential for quantum criticality.

Main Methods:

  • Transmission electron microscopy (TEM) experiments.
  • Variable temperature characterization.
  • Analysis of soft modes and diffuse scattering.

Main Results:

  • For x ≤ 0.05, soft modes condense at a transition temperature (TC), forming a superstructure.
  • TC is suppressed by Sr-substitution, disappearing for x ≥ 0.1.
  • The soft mode deviates from commensurate value and survives in nanoscaled regions below 200 K.
  • Honeycomb-type diffuse scatterings indicate soft modes up to 800 K.

Conclusions:

  • Sr-substitution significantly impacts the structural stability of BaAl2O4.
  • The observed phenomena suggest the emergence of quantum criticality induced by soft modes.
  • Intrinsic structural instability is a defining characteristic of this framework compound.