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Related Concept Videos

Transformation of Plane Strain01:12

Transformation of Plane Strain

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When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
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Shrinkage in Concrete01:27

Shrinkage in Concrete

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Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain.
When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...
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Transformation of Plane Stress01:18

Transformation of Plane Stress

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Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
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Thermal Sigmatropic Reactions: Overview01:16

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
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Carbonation Shrinkage01:24

Carbonation Shrinkage

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Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
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Torsion of Noncircular Members01:16

Torsion of Noncircular Members

524
Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
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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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Giant In-Plane Shrinkage Induced by Structural Phase Transformation in TbCoSi2.

Lulu Liu1,2,3, Dinghui Wang4, Shoutao Zhang5

  • 1School of Electronic Engineering, Nanjing Xiaozhuang University, Nanjing 211171, China.

Materials (Basel, Switzerland)
|November 13, 2025
PubMed
Summary

Researchers discovered TbCoSi2 exhibits significant in-plane shrinkage due to structural phase transitions. This metal-based material offers potential for precise thermal expansion control in advanced applications.

Keywords:
antiferromagnetic orderingmetal-based materialsnegative thermal expansionstructural phase transition

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • High thermal expansion of metal-based materials limits advanced applications.
  • Negative thermal expansion (NTE) materials offer solutions for thermal expansion regulation.
  • Intermetallic compounds are a key area for NTE material research.

Purpose of the Study:

  • Investigate the thermal expansion properties of polycrystalline TbCoSi2.
  • Identify the structural and magnetic mechanisms behind observed thermal expansion.
  • Explore the potential of TbCoSi2 for precise thermal expansion control.

Main Methods:

  • Temperature-dependent X-ray diffraction (XRD) and Rietveld refinement.
  • Macroscopic magnetic measurements.
  • First-principles calculations.

Main Results:

  • Polycrystalline TbCoSi2 shows a 3% in-plane shrinkage between 223 K and 298 K.
  • Structural phase transition to a low-temperature Pbcm space group drives a-axis shrinkage and in-plane contraction.
  • Antiferromagnetic structure observed below 13.7 K, independent of the structural phase transition.

Conclusions:

  • TbCoSi2 exhibits significant negative thermal expansion properties.
  • The material's thermal expansion is primarily driven by structural changes.
  • TbCoSi2 is a weakly magnetic material suitable for uniaxial thermal expansion control.