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Related Concept Videos

Phase Transitions02:31

Phase Transitions

Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
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Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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States of Matter and Phase Changes

The internal energy of a substance—the total kinetic energy of all its molecules and the potential energy of their associated forces—depends on the strength of the intermolecular forces in the condensed phases and the pressure exerted on the substance. The internal energy of a substance is the highest in the gaseous state, the lowest in the solid state, and intermediate in the liquid state. Phase transitions are caused by changes in physical conditions, such as temperature and pressure, that...
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The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
Phase Transitions01:21

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A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
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A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. It shows the boundaries between solid, liquid, and gas phases and the conditions at which these phases coexist in equilibrium. An area in a phase diagram represents a single phase, whereas lines or phase boundaries represent the equilibrium between two phases.In the phase diagram of water, the boundary line between the solid and liquid states illustrates...

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Temperature- and Phase-Dependent Phonon Renormalization in 1T'-MoS2.

Sherman Jun Rong Tan1,2, Soumya Sarkar2,3, Xiaoxu Zhao1,2

  • 1Department of Chemistry , National University of Singapore , Singapore 117543.

ACS Nano
|May 1, 2018
PubMed
Summary

Alkali metal intercalation engineers molybdenum disulfide (MoS2) polymorphs, tuning properties. This study reveals how phase composition impacts phonon modes and lattice strain in Li-intercalated MoS2.

Keywords:
MoS2Raman spectroscopyphase engineeringphonontemperature coefficientvibration

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Polymorph engineering of molybdenum disulfide (MoS2) via alkali metal intercalation is a key strategy for tuning its electrical and catalytic properties.
  • The 2H to 1T' phase conversion in MoS2 leads to reduced crystal domain size and lattice strain, but the compositional dependence is not well understood.

Purpose of the Study:

  • To investigate the evolution of phonon modes in Li-intercalated 1T'-MoS2 (LixMoS2) as a function of varying 1T'-2H phase compositions.
  • To understand the relationship between phase composition, lattice strain, and phonon behavior in mixed-phase MoS2.

Main Methods:

  • Raman spectroscopy was employed to probe the phonon modes.
  • The study analyzed the softening of specific Raman modes (Bg (J1), Ag (J3), E12g, and A1g) with increasing 1T' phase content.
  • First-order temperature coefficients of the 1T' phonon mode were measured and correlated with composition.

Main Results:

  • Strain evolution in mixed 2H/1T' MoS2 phases was observed through the softening of four characteristic Raman modes with increasing 1T' composition.
  • The first-order temperature coefficients of the 1T' phonon mode showed a linear variation with increasing 1T' phase composition.
  • The observed phenomena were attributed to enhanced electron-phonon and strain-phonon coupling.

Conclusions:

  • The study provides insights into the impact of phase composition on lattice strain and phonon dynamics in Li-intercalated MoS2.
  • The findings highlight the role of electron-phonon and strain-phonon coupling in governing the temperature dependence of phonon modes in mixed-phase MoS2.