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Title: Decomposition of L a 2 x S r x Cu O 4 into several L a 2 O 3 phases at elevated temperatures in ultrahigh vacuum inside a transmission electron microscope

Abstract

Here, we report the decomposition of La 2–xSr xCuO 4 into La 2O 3 and Cu nanoparticles in ultrahigh vacuum, observed by in situ heating experiments in a transmission electron microscope. The analysis of electron diffraction data reveals that the phase decomposition process starts at about 150°C and is considerably expedited in the temperature range of 350°C–450°C. Two major resultant solid phases are identified as metallic Cu and La 2O 3 by electron diffraction, simulation, and electron energy-loss spectroscopy (EELS) analyses. With the aid of calculations, La 2O 3 phases are further identified to be derivatives of a fluorite structure—fluorite, pyrochlore, and (distorted) bixbyite—characterized by different oxygen-vacancy order. Additionally, the bulk plasmon energy and the fine structures of the O K and LaM 4,5 EELS edges are reported for these structures, along with simulated O K x-ray absorption near-edge structure. The resultant Cu nanoparticles and La 2O 3 phases remain unchanged after cooling to room temperature.

Authors:
 [1];  [1]; ORCiD logo [2];  [1];  [3];  [1];  [1]
  1. Univ. of Minnesota, Minneapolis, MN (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Tokyo Institute of Technology, Kanagawa (Japan)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1439293
Alternate Identifier(s):
OSTI ID: 1437205
Report Number(s):
[BNL-205701-2018-JAAM]
[Journal ID: ISSN 2475-9953; PRMHAR; TRN: US1900594]
Grant/Contract Number:  
[SC0012704; 16-039]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
[ Journal Volume: 2; Journal Issue: 5]; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Jeong, Jong Seok, Wu, Wangzhou, Topsakal, Mehmet, Yu, Guichuan, Sasagawa, Takao, Greven, Martin, and Mkhoyan, K. Andre. Decomposition of La2–xSrxCuO4 into several La2O3 phases at elevated temperatures in ultrahigh vacuum inside a transmission electron microscope. United States: N. p., 2018. Web. doi:10.1103/PhysRevMaterials.2.054801.
Jeong, Jong Seok, Wu, Wangzhou, Topsakal, Mehmet, Yu, Guichuan, Sasagawa, Takao, Greven, Martin, & Mkhoyan, K. Andre. Decomposition of La2–xSrxCuO4 into several La2O3 phases at elevated temperatures in ultrahigh vacuum inside a transmission electron microscope. United States. doi:10.1103/PhysRevMaterials.2.054801.
Jeong, Jong Seok, Wu, Wangzhou, Topsakal, Mehmet, Yu, Guichuan, Sasagawa, Takao, Greven, Martin, and Mkhoyan, K. Andre. Tue . "Decomposition of La2–xSrxCuO4 into several La2O3 phases at elevated temperatures in ultrahigh vacuum inside a transmission electron microscope". United States. doi:10.1103/PhysRevMaterials.2.054801. https://www.osti.gov/servlets/purl/1439293.
@article{osti_1439293,
title = {Decomposition of La2–xSrxCuO4 into several La2O3 phases at elevated temperatures in ultrahigh vacuum inside a transmission electron microscope},
author = {Jeong, Jong Seok and Wu, Wangzhou and Topsakal, Mehmet and Yu, Guichuan and Sasagawa, Takao and Greven, Martin and Mkhoyan, K. Andre},
abstractNote = {Here, we report the decomposition of La2–xSrxCuO4 into La2O3 and Cu nanoparticles in ultrahigh vacuum, observed by in situ heating experiments in a transmission electron microscope. The analysis of electron diffraction data reveals that the phase decomposition process starts at about 150°C and is considerably expedited in the temperature range of 350°C–450°C. Two major resultant solid phases are identified as metallic Cu and La2O3 by electron diffraction, simulation, and electron energy-loss spectroscopy (EELS) analyses. With the aid of calculations, La2O3 phases are further identified to be derivatives of a fluorite structure—fluorite, pyrochlore, and (distorted) bixbyite—characterized by different oxygen-vacancy order. Additionally, the bulk plasmon energy and the fine structures of the O K and LaM4,5 EELS edges are reported for these structures, along with simulated O K x-ray absorption near-edge structure. The resultant Cu nanoparticles and La2O3 phases remain unchanged after cooling to room temperature.},
doi = {10.1103/PhysRevMaterials.2.054801},
journal = {Physical Review Materials},
number = [5],
volume = [2],
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: Low-magnification BF-TEM image (a) and highresolution HAADF-STEM image (b) from a [110]-oriented La2−xSrxCuO4 (x = 0.03) specimen. The inset to (a) is a corresponding SAED pattern. The scale bar of the inset is 2 nm−1. The atomic-resolution HAADF-STEM image shows the K2NiF4 structure, which is the structure ofmore » the n = 1 Ruddlesden-Popper phase with stacking sequence (La3+Cu2+O3)1−–(La3+O2−)1+ along the c axis. A schematic of the atomic structure is superimposed in the lowerleft corner of panel (b): La/Sr (green), Cu (blue), and O (red). LAADF-STEM image of an {113}-antiphase boundary is shown in the upper-right inset of panel (b).« less

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