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Related Concept Videos

Phase Diagram01:19

Phase Diagram

6.1K
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).
6.1K
Phase Diagrams02:39

Phase Diagrams

44.2K
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
44.2K
States of Matter and Phase Changes00:59

States of Matter and Phase Changes

1.3K
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...
1.3K
Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

18.8K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase...
18.8K
Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

18.1K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
18.1K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.9K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
17.9K

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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
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Using Howardevansite Framework Adaptivity to Explore the Li2O-Fe2O3-V2O5 Phase Diagram.

Charles Chénier1, Yasmine Benabed1, Laurent Castro2

  • 1Département de Chimie/Institut Courtois, Université de Montréal, C.P. 61281375, Avenue Thérèse-Lavoie-Roux, Montréal, Quebec H2 V 0B3, Canada.

Inorganic Chemistry
|June 24, 2025
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Summary
This summary is machine-generated.

A novel iron vanadate, Li1.5Fe5.5(VO4)6, was synthesized and exhibits potential as a positive electrode material for lithium-ion batteries due to its reversible lithium-ion insertion capability.

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Area of Science:

  • Solid-state chemistry and materials science.
  • Inorganic synthesis and crystal structure determination.
  • Electrochemical energy storage materials.

Background:

  • The Li2O-Fe2O3-V2O5 ternary phase diagram is explored for new materials.
  • Howardevansite β-Cu3Fe4(VO4)6 serves as a structural template.
  • Iron vanadates are investigated for electrochemical applications.

Purpose of the Study:

  • To synthesize a new iron vanadate material within the Li-Fe-V-O system.
  • To characterize the crystal structure and magnetic properties of the synthesized compound.
  • To evaluate its performance as a positive electrode material for lithium-ion batteries.

Main Methods:

  • Solid-state synthesis using framework adaptivity of β-Cu3Fe4(VO4)6.
  • Single-crystal X-ray diffraction for structural analysis.
  • Magnetic susceptibility measurements.
  • Electrochemical testing (galvanostatic cycling) for lithium-ion insertion.

Main Results:

  • Successfully synthesized Li1.5Fe5.5(VO4)6, crystallizing in the triclinic P1̅ space group.
  • The structure features zigzag iron-based chains within a 3D framework accommodating Li+ ions.
  • Magnetic susceptibility confirmed the presence of high-spin Fe3+ ions.
  • Electrochemical tests showed reversible Li+ insertion up to 5.5 ions with a theoretical capacity of 146 mA h/g.

Conclusions:

  • Li1.5Fe5.5(VO4)6 is a viable insertion positive electrode material for lithium-ion batteries.
  • The material demonstrates good reversible capacity (78 mA h/g after 100 cycles at C/10).
  • Structural and magnetic properties are consistent with its electrochemical performance.