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関連する概念動画

Thermal Strain01:19

Thermal Strain

2.8K
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...
2.8K
Shearing Strain01:20

Shearing Strain

1.3K
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
1.3K
Measurements of Strain01:27

Measurements of Strain

2.6K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
2.6K
Strain Energy01:13

Strain Energy

936
Strain energy is a fundamental concept in the field of materials science and structural engineering, describing the energy absorbed by a material or structure when it is deformed under load.
Consider a rod that is fixed at one end and subjected to an axial force at the free end. This axial force induces stress within the rod, leading to its elongation. As the axial force increases, so does the elongation of the rod, illustrating a direct relationship between the force applied and the resulting...
936
Stress-Strain Diagram01:10

Stress-Strain Diagram

2.3K
A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
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Transformation of Plane Strain01:12

Transformation of Plane Strain

498
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...
498

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関連する実験動画

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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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光学的にストレートされたSrTiO3におけるメタステーブル・フェロ電気性

T F Nova1,2, A S Disa3, M Fechner3

  • 1Max Planck Institute for the Structure and Dynamics of Matter, Hamburg 22761, Germany. tobia.nova@mpsd.mpg.de andrea.cavalleri@mpsd.mpg.de.

Science (New York, N.Y.)
|June 15, 2019
PubMed
まとめ
この要約は機械生成です。

光学刺激は,ストロンチウムチタナート (SrTiO3) 量子パラエレクトリックにおいて,光誘導によるフェロ電気的相変化を誘導することができる. この転移状態は 室温でも何時間も続きます

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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique
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科学分野:

  • 凝縮物質物理学
  • 材料科学
  • 量子パラエレクトリック

背景:

  • 固体における波動的な順序はしばしば対称性の断絶の段階を先行する.
  • 量子パラエレクトリックストロンチウムチタネート (SrTiO3) のような一部の材料では,波動がゼロ温度まで持続し,長距離秩序を阻害する.
  • SrTiO3は冷却時に二極の変動が増加するが,鉄電的秩序を達成しない.

研究 の 目的:

  • ストロンチウムチタネート (SrTiO3) に光学刺激による極性秩序を誘導する可能性を調査する.
  • 光誘導極相の性質と持続性を特徴付ける.
  • フォトフレクソ電気カップリングなどの基礎的なメカニズムを探求し,光誘導相変遷を駆動する.

主な方法:

  • SrTiO3における格子振動の光学刺激
  • 誘導された極相の安定性を決定する温度依存測定.
  • 低周波振動分析で,相変化を検出する.
  • 空間的な領域分布分析

主要な成果:

  • 光学刺激により,SrTiO3でメタステーブルな極相が成功しました.
  • この光誘導の極相は290ケルビンまで観測され,光学ポンプの停止後も数時間持続した.
  • 低周波の振動の硬化が フォト誘導によるフェロ電気的相変化を示した.
  • 観測されたドメイン分布は,光反射電気結合の役割を示唆した.

結論:

  • 光学刺激は,SrTiO3のような量子パラエレクトリックの極性秩序を誘導し制御する経路を提供します.
  • メタステーブルな,光誘導のフェロ電気フェーズが達成され,長期間維持できます.
  • フォトフレキソ電気カップリングは,観測されたフォト誘発のフェロ電気相転換に寄与する可能性が高いメカニズムである.