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Structure of liquid Y3Al5O12 (YAG)

Weber¹, Krishnan, Ansell

¹Containerless Research, Inc., Evanston, Illinois 60201, USA.

Physical Review Letters

|October 6, 2000

Summary

This study measured the structure of liquid Y3Al5O12 (YAG) at high temperatures using X-ray scattering. Molten YAG exhibits distinct coordination numbers and structural arrangements, with sensitivity to temperature and gas composition.

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Area of Science:

Materials Science
Physical Chemistry
Condensed Matter Physics

Background:

Yttrium Aluminum Garnet (YAG) is a crucial material in various high-temperature applications.
Understanding the liquid state structure of YAG is essential for controlling its properties during processing and use.
Previous studies on molten YAG structure are limited, especially under controlled atmospheric conditions.

Purpose of the Study:

To determine the atomic-level structure of liquid Y3Al5O12 (YAG) at high temperatures (1770-2230 K).
To investigate the influence of temperature and ambient gas composition (Ar and O2) on the liquid YAG structure.
To characterize the coordination numbers and interatomic distances in molten YAG.

Main Methods:

X-ray scattering experiments were performed on liquid YAG under containerless conditions.
Measurements were conducted at temperatures ranging from 1770 K to 2230 K.
The total structure factor S(Q) and radial distribution function G(r) were analyzed.

Main Results:

Nominal coordination numbers were determined as 4 for Al3+ and 6 for Y3+ ions.
Radial distribution function G(r) showed distinct peaks corresponding to Al-O (approx. 1.8 Å), Y-O (approx. 2.25 Å), and metal-metal distances (approx. 3.3-3.6 Å).
Molten YAG exhibited narrower Al-O and Y-O peaks compared to pure oxides, with increased sensitivity to temperature and gas composition.

Conclusions:

The liquid structure of YAG is characterized by specific coordination polyhedra (AlO5-4 and YO9-6).
The structural integrity and response to external conditions are key features of molten YAG.
This research provides fundamental insights into the behavior of YAG at extreme temperatures, relevant for materials processing and high-temperature science.

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