Journal article
Effect of cation off-stoichiometry on optical absorption in epitaxial LaFeO 3 films
Physical chemistry chemical physics : PCCP, v 19(16), pp 10371-10376
2017
PMID: 28379257
Abstract
We have investigated the effect of La and Fe deficiency on the
c
-axis lattice parameter and optical absorption in La
1−x
Fe
1−y
O
3−δ
films deposited by oxide MBE. La deficient films display minimal changes in optical and structural properties compared with stoichiometric LaFeO
3
, even with relatively large cation vacancy concentrations (∼22%). Fe deficient films show a linear increase in
c
-axis parameter with increasing Fe vacancy concentration. The optical absorption coefficient is reduced for Fe deficient films over the spectral range from 1.2 to 5.0 eV. This leads to a relatively simple and effective method to quantify the approximate Fe deficiency in LaFeO
3
. Minimal changes in optical and structural properties are observed when cation deficient films are exposed to strongly oxidizing (ozone annealing) conditions. This indicates a strong accompaniment of charge balancing oxygen vacancies to maintain a nominal Fe
3+
valence state, acting to stabilize the band structure even in the presence of significant cation off-stoichiometry.
Metrics
Details
- Title
- Effect of cation off-stoichiometry on optical absorption in epitaxial LaFeO 3 films
- Creators
- Mark D. Scafetta - Drexel UniversitySteven J. May - Drexel University
- Publication Details
- Physical chemistry chemical physics : PCCP, v 19(16), pp 10371-10376
- Publisher
- Royal Society of Chemistry
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000400117700019
- Scopus ID
- 2-s2.0-85019989942
- Other Identifier
- 991019167702104721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical
- Physics, Atomic, Molecular & Chemical