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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

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Published on: October 11, 2016

Quadruple-junction lattice coherency and phase separation in a binary-phase system.

Sung-Yoon Chung¹, Si-Young Choi², Jin-Gyu Kim³

¹Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea.

Nature Communications

|September 9, 2015

Summary

Phase separation in crystalline systems creates new boundaries at quadruple junctions to release strain. This study reveals novel morphologies and crystallographic orientations driven by interface tensions at these critical points.

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Area of Science:

Materials Science
Crystallography
Solid-State Physics

Background:

Coherent phase boundaries typically form in binary crystalline systems with similar lattice parameters.
Previous research focused on coherency elastic energy but overlooked the role of multiple interface junctions.

Purpose of the Study:

To investigate phase-separation behavior at quadruple junctions in crystalline systems.
To understand how multiple interfaces meeting at a junction influence morphology and strain relaxation.

Main Methods:

High-temperature in-situ transmission electron microscopy (TEM).
Atomic-resolution visualization of quadruple junctions.
Analysis of crystallographic orientations and interface tensions.

Main Results:

A novel phase-separation morphology is induced to release coherency strain at quadruple junctions.
New phase boundaries with unique crystallographic orientations emerge over twinned crystals.
Force equilibrium between interface tensions governs the formation of these boundaries.

Conclusions:

Multiple interface junctions significantly impact morphology evolution during phase separation.
Quadruple junctions act as critical sites for strain relaxation through the formation of new crystallographic orientations.
Understanding interface tensions at junctions is key to predicting phase-separation behavior.