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Related Concept Videos

Singularity Functions for Shear01:26

Singularity Functions for Shear

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In structural analysis, singularity functions are crucial in simplifying the representation of shear forces in beams under discontinuous loading. These functions describe discontinuous  variations in shear force across a beam with varying loads by using a single mathematical expression, regardless of the complexity of the loading conditions. The singularity functions are derived from creating a free-body diagram of the beam and then making conceptual cuts at specific points to examine the...
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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
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Structural singularities in Ge(x)Te(100-x) films.

A A Piarristeguy1, M Micoulaut2, R Escalier1

  • 1Institut Charles Gerhardt, UMR 5253-CNRS, Case 1503, Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France.

The Journal of Chemical Physics
|August 24, 2015
PubMed
Summary
This summary is machine-generated.

This study reveals two critical structural transitions in Germanium-Tellurium (Ge(x)Te(100-x)) films. These transitions, linked to bond changes and Ge-Ge bond formation, explain material aging in phase-change devices.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Chemical Engineering

Background:

  • Germanium-Tellurium (Ge(x)Te(100-x)) films are crucial for phase-change memory devices.
  • Understanding their structural properties is key to predicting material aging and device reliability.

Purpose of the Study:

  • To investigate the structural singularities in Ge(x)Te(100-x) films across a wide concentration range.
  • To elucidate the origins of these singularities and their relationship to material properties and aging.

Main Methods:

  • Structural and calorimetric investigations were performed on Ge(x)Te(100-x) films (10 < x < 50).
  • Analysis included bond distribution, bond variability, and glass thermal stability.
  • Key structural features and correlations were examined at intermediate length scales.

Main Results:

  • Two structural singularities were identified at approximately x = 22 at.% and x = 33-35 at.%.
  • The first singularity is attributed to a flexible/rigid transition, marking the onset of Ge-Ge homopolar bonds.
  • The second singularity is linked to the disappearance of the undercooled region and enhanced Ge-Ge correlations.

Conclusions:

  • The identified singularities correlate with resistance drift thresholds in phase-change materials.
  • The breaking of homopolar Ge-Ge bonds is confirmed as a primary mechanism for material aging.
  • These findings support existing models of phase-change material degradation.