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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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Phase Transformation in Barium Tetraborate.

C R Robbins1, E M Levin1

  • 1Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234.

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
|January 14, 2020
PubMed
Summary
This summary is machine-generated.

Barium borate (BaB8O13) undergoes a reversible phase transition at 700°C, changing from an orthorhombic to a tetragonal structure. This displaces atoms and alters crystal symmetry, impacting material properties.

Keywords:
BaB8O13heat of transformationorthorhombic formpolymorphismtetragonal form

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Materials science

Background:

  • Barium borate (BaB8O13) exhibits complex crystal structures.
  • Understanding phase transitions is crucial for materials applications.

Purpose of the Study:

  • To investigate the reversible phase transition of orthorhombic BaB8O13.
  • To characterize the structural and thermodynamic properties of the transition.

Main Methods:

  • X-ray diffraction analysis at varying temperatures.
  • Calorimetry to determine latent heat.
  • Microscopy to observe domain formation.

Main Results:

  • Orthorhombic BaB8O13 transforms to a tetragonal phase at 700°C.
  • The transition involves a discontinuous change in cell constants and a reduction in cell contents (Z=8 to Z=4).
  • Latent heat of transformation is 2100 J/mol, with a dT/dP of -0.0363 K/bar.

Conclusions:

  • The transition is rapid, displacive, and reversible.
  • Volume strain is accommodated by twinning or domain formation.
  • The tetragonal phase is stable up to the congruent melting point of 889°C.