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Title 

Atomistic evolution during the phase transition on a metastable single NaYF4:Yb,Er upconversion nanoparticle

Authors 

M W PinEun Jin ParkS ChoiY I KimChang Hoon JeonTai Hwan HaY H Kim

Publisher 

Nature Publishing Group

Issue Date 

2018

Citation 

Scientific Reports

Abstract 

The phase evolution of as-prepared NaYF4:Yb,Er upconversion nanoparticles (UCNPs) with a metastable cubic structure is studied based on in situ heating experiments via transmission electron microscopy (TEM). The atomistic behavior on the single NaYF4:Yb,Er UCNP is observed during the phase transition. The formation and evolution of voids on the NaYF4:Yb,Er UCNP appear at a temperature below 420 °C. Small circular voids are transformed at the initial stage to a large, hexagonal-pillar shaped single void. Two different routes to reach the stable α-phase from the metastable cubic structure are identified on a single NaYF4:Yb,Er UCNP. The first is via a stable β-phase and the second is a direct change via a liquid-like phase. The specific orientation relationships, [110]cubic//[11220]hexagonal and {002}cubic//{22200}hexagonal, between the cubic and hexagonal structures are confirmed. Additionally, a few extra-half planes terminated in the cubic structures are also observed at the cubic/hexagonal interface

ISSN 

2045-2322

Link 

http://dx.doi.org/10.1038/s41598-018-20702-9

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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