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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Isotropic Zero Thermal Expansion in (Sc0.85Al0.1Cr0.05)F3.

Fei Wang1,2, Shibo Zhao1, Jiang Liu2

  • 1School of Physics, Zhengzhou University, Zhengzhou 450001, China.

Inorganic Chemistry
|January 16, 2026
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Researchers developed a new zero thermal expansion material, (Sc0.85Al0.1Cr0.05)F3, using solid-state reactions. This discovery offers potential for advanced precision equipment by understanding its unique thermal expansion mechanism.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Condensed Matter Physics

Background:

  • Zero thermal expansion materials, exhibiting the Invar effect, are crucial for high-precision equipment.
  • Understanding the mechanisms behind zero thermal expansion is key to designing advanced materials.

Purpose of the Study:

  • To synthesize and characterize a novel zero thermal expansion fluoride material.
  • To elucidate the underlying mechanism of zero thermal expansion in the synthesized material.

Main Methods:

  • Solid-state reaction method for material synthesis.
  • Variable-temperature X-ray diffraction and pair distribution function analysis.
  • Density functional theory (DFT) calculations.

Main Results:

  • A new zero thermal expansion material, (Sc0.85Al0.1Cr0.05)F3, was successfully prepared with a linear thermal expansion coefficient of -0.83 × 10⁻⁶ K⁻¹ between 173-473 K.
  • Local structural distortions induced by Al and Cr incorporation were identified, influencing fluorine atom vibrational modes.
  • DFT calculations confirmed a weighted sum of the Grüneisen parameter near zero, consistent with observed zero thermal expansion.

Conclusions:

  • The study presents a new fluoride-based zero thermal expansion material.
  • The findings reveal the structure-property relationship governing thermal expansion in this material, highlighting the role of local distortions and vibrational modes.