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

Nature Communications
Sung-Yoon ChungYoung-Min Kim

Abstract

If each phase has an identical crystal structure and small misfit in the lattice parameters in a binary-phase crystalline system, coherent phase boundaries usually form during separation. Although there have been numerous studies on the effect of coherency elastic energy, no attempt has been made to demonstrate how the phase-separation behaviour varies when multiple interfaces meet at a junction. Here we show that a comprehensively different phase-separation morphology is induced, to release the high coherency strain confined to quadruple junctions. High-temperature in-situ transmission electron microscopy reveals that phase boundaries with a new crystallographic orientation emerge over twinned crystals to provide strain relaxation at quadruple junctions. The high coherency strain and the formation of different phase boundaries can be understood in terms of the force equilibrium between interface tensions at a junction point. Visualizing the quadruple points at atomic resolution, our observations emphasize the impact of multiple junctions on the morphology evolution during phase separation.

References

Aug 30, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Ramón Pericet-CámaraElmar Bonaccurso
Jun 4, 2011·Physical Review Letters·Elizabeth R JerisonEric R Dufresne
Oct 18, 2011·Nature Materials·G CatalanB Noheda
Feb 7, 2012·ACS Nano·Daniel A Cogswell, Martin Z Bazant
Mar 10, 2012·Physical Review Letters·M D RossellR Ramesh
Jun 6, 2012·Nano Letters·Sung-Yoon ChungSuk-Joong L Kang
May 22, 2013·Journal of the American Chemical Society·Sung-Yoon ChungJin-Gyu Kim
Jul 11, 2014·Nature Communications·Su Ji ParkJung Ho Je

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BETA
transmission electron microscopy
electron diffraction

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GPA

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