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Stabilization of 6H-Hexagonal SrMnO3 Polymorph by Al2O3 insertion

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Abstract
We demonstrate the structural evolution of polymorphic phases in Al2O3-inserted SrMnO3 ceramics synthesized by solid state reaction. While the 4H-hexagonal phase is predominant in pure SrMnO3 ceramics, a small amount of 6H-hexagonal polymorph is identified in addition to the primary 4H-hexagonal SrMnO3 and the secondary hexagonal SrAl2O4 phases in the as-sintered ceramics, evidenced by x-ray diffraction and subsequent Rietveld refinement analyses. The existence of the 6H-hexagonal SrMnO3 phase is corroborated using Raman spectroscopy. The chemical compositions and electronic structures of the Al2O3-inserted SrMnO3 compounds are also examined using energy dispersive spectroscopy and x-ray photoelectron spectroscopy, respectively. The firstprinciples calculations reveal that there is no clear difference between the total energies of 4H- and 6H-hexagonal
polymorphs regardless of the presence/absence of Sr and oxygen vacancies. Possible origins are discussed with the estimation of actual strain based on the refined lattice parameter of 6H SrMnO3.
Author(s)
시라즈 무하마드라시드 마문 우르알리 아사드파즐리 아카람이호정최진산배종성김용수신영한안창원김태헌
Issued Date
2021
Type
Article
Keyword
ceramicsoxidestructural phase transitionx-ray diffraction
DOI
10.1016/j.jeurceramsoc.2021.03.060
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9509
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_crossref_primary_10_1016_j_jeurceramsoc_2021_03_060&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Stabilization%20of%206H-Hexagonal%20SrMnO3%20Polymorph%20by%20Al2O3%20insertion&offset=0&pcAvailability=true
Publisher
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Location
영국
Language
영어
ISSN
0955-2219
Citation Volume
41
Citation Number
10
Citation Start Page
5155
Citation End Page
5162
Appears in Collections:
Natural Science > Physics
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