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Related Concept Videos

Solid–Solid Solutions01:24

Solid–Solid Solutions

The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
Phase Diagram01:19

Phase Diagram

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 Diagrams of Ternary Systems01:28

Phase Diagrams of Ternary Systems

Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Phase Diagrams02:39

Phase Diagrams

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...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Phase separation in garnet solid solutions and its effect on optical properties.

Shakiba Kaveh1, Clément P Tremblay, Nurhakimah Norhashim

  • 1Department of Materials Science and Metallurgy, Cambridge University, Pembroke street, CB2 3QZ, UK.

Advanced Materials (Deerfield Beach, Fla.)
|September 3, 2013
PubMed
Summary
This summary is machine-generated.

Erbium-doped Y3 Al5 O12 (YAG) garnets show phase separation between 8 and 50 at% erbium. This separation significantly impacts the optical properties of YAG:Er(3+).

Keywords:
erbium-doped YAGphase separationphotoluminescencesolid-state synthesis

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Formation of Thick Dense Yttrium Iron Garnet Films Using Aerosol Deposition
10:52

Formation of Thick Dense Yttrium Iron Garnet Films Using Aerosol Deposition

Published on: May 15, 2015

Area of Science:

  • Materials Science
  • Solid-state Chemistry
  • Crystallography

Background:

  • Yttrium Aluminum Garnet (YAG) is a widely used host material for phosphors and lasers.
  • Erbium doping (Er3+) in YAG is crucial for various optical applications.
  • Understanding phase behavior in doped garnets is essential for controlling material properties.

Purpose of the Study:

  • To investigate the phase behavior of erbium-doped Y3 Al5 O12 (YAG) garnets.
  • To determine the critical erbium concentration range for phase separation.
  • To correlate phase separation with optical property changes.

Main Methods:

  • Solid-state reaction synthesis of erbium-doped YAG.
  • High-resolution synchrotron X-ray diffraction (XRD) for structural analysis.
  • Scanning Electron Microscopy with Energy Dispersive X-ray analysis (SEM-EDX) for compositional and morphological characterization.

Main Results:

  • Phase separation was observed in erbium-doped YAG at erbium concentrations between 8 and 50 at%.
  • The exact composition range for phase separation is dependent on synthesis and processing conditions.
  • Similar phase separation phenomena were noted in related garnet systems.
  • The observed phase separation markedly influences the optical characteristics of YAG:Er(3+).

Conclusions:

  • Solid-state synthesis of YAG:Er(3+) can lead to phase separation within a specific erbium content range.
  • Processing conditions play a critical role in determining the extent of phase separation.
  • Phase separation in YAG:Er(3+) is a key factor affecting its optical performance.