Strain-induced direct band gap LaAlO 3 nanocrystals

C. L. Yuan; B. Xu; W. Lei

doi:10.1016/j.matlet.2011.11.001

Strain-induced direct band gap LaAlO ₃ nanocrystals

C. L. Yuan^*, B. Xu, W. Lei

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Bulk LaAlO ₃ has a rhombohedral structure at ambient conditions. However, when the diameter of free-standing LaAlO ₃ nanocrystal is smaller than 100 nm, it has at room temperature a thermodynamically stable cubic structure with indirect band gap. The LaAlO ₃ nanocrystals embedded in amorphous Lu ₂O ₃ matrix were fabricated using pulsed laser deposition method and rapid thermal annealing technique. The LaAlO ₃ nanocrystals experience a net deviatoric strain from Lu ₂O ₃ matrix, which causes a distortion of the AlO ₆ octahedra. This leads to the growth of strain-induced direct band gap LaAlO ₃ nanocrystals with rhombohedral structure. Strain engineering is an effective tool for tailoring the properties of LaAlO ₃ nanocrystals.

Original language	English
Pages (from-to)	392-394
Number of pages	3
Journal	Materials Letters
Volume	68
DOIs	https://doi.org/10.1016/j.matlet.2011.11.001
Publication status	Published - 1 Feb 2012

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10.1016/j.matlet.2011.11.001

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title = "Strain-induced direct band gap LaAlO 3 nanocrystals",

abstract = "Bulk LaAlO 3 has a rhombohedral structure at ambient conditions. However, when the diameter of free-standing LaAlO 3 nanocrystal is smaller than 100 nm, it has at room temperature a thermodynamically stable cubic structure with indirect band gap. The LaAlO 3 nanocrystals embedded in amorphous Lu 2O 3 matrix were fabricated using pulsed laser deposition method and rapid thermal annealing technique. The LaAlO 3 nanocrystals experience a net deviatoric strain from Lu 2O 3 matrix, which causes a distortion of the AlO 6 octahedra. This leads to the growth of strain-induced direct band gap LaAlO 3 nanocrystals with rhombohedral structure. Strain engineering is an effective tool for tailoring the properties of LaAlO 3 nanocrystals.",

keywords = "Nanoparticles, Phase transformation",

author = "Yuan, {C. L.} and B. Xu and W. Lei",

year = "2012",

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language = "English",

volume = "68",

pages = "392--394",

journal = "Materials Letters",

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T1 - Strain-induced direct band gap LaAlO 3 nanocrystals

AU - Yuan, C. L.

AU - Xu, B.

AU - Lei, W.

PY - 2012/2/1

Y1 - 2012/2/1

N2 - Bulk LaAlO 3 has a rhombohedral structure at ambient conditions. However, when the diameter of free-standing LaAlO 3 nanocrystal is smaller than 100 nm, it has at room temperature a thermodynamically stable cubic structure with indirect band gap. The LaAlO 3 nanocrystals embedded in amorphous Lu 2O 3 matrix were fabricated using pulsed laser deposition method and rapid thermal annealing technique. The LaAlO 3 nanocrystals experience a net deviatoric strain from Lu 2O 3 matrix, which causes a distortion of the AlO 6 octahedra. This leads to the growth of strain-induced direct band gap LaAlO 3 nanocrystals with rhombohedral structure. Strain engineering is an effective tool for tailoring the properties of LaAlO 3 nanocrystals.

AB - Bulk LaAlO 3 has a rhombohedral structure at ambient conditions. However, when the diameter of free-standing LaAlO 3 nanocrystal is smaller than 100 nm, it has at room temperature a thermodynamically stable cubic structure with indirect band gap. The LaAlO 3 nanocrystals embedded in amorphous Lu 2O 3 matrix were fabricated using pulsed laser deposition method and rapid thermal annealing technique. The LaAlO 3 nanocrystals experience a net deviatoric strain from Lu 2O 3 matrix, which causes a distortion of the AlO 6 octahedra. This leads to the growth of strain-induced direct band gap LaAlO 3 nanocrystals with rhombohedral structure. Strain engineering is an effective tool for tailoring the properties of LaAlO 3 nanocrystals.

KW - Nanoparticles

KW - Phase transformation

UR - http://www.scopus.com/inward/record.url?scp=82055184047&partnerID=8YFLogxK

U2 - 10.1016/j.matlet.2011.11.001

DO - 10.1016/j.matlet.2011.11.001

M3 - Article

SN - 0167-577X

VL - 68

SP - 392

EP - 394

JO - Materials Letters

JF - Materials Letters

ER -

Strain-induced direct band gap LaAlO ₃ nanocrystals

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