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Title: Cation and anion topotactic transformations in cobaltite thin films leading to Ruddlesden-Popper phases.

Journal Article · · Physical Review Materials

Topotactic transformations involve structural changes between related crystal structures due to a loss or gain of material while retaining a crystallographic relationship. The perovskite oxide La0.7Sr0.3CoO3 (LSCO) is an ideal system for investigating phase transformations due to its high oxygen vacancy conductivity, relatively low oxygen vacancy formation energy, and strong coupling of the magnetic and electronic properties to the oxygen stoichiometry. While the transition between cobaltite perovskite and brownmillerite (BM) phases has been widely reported, further reduction beyond the BM phase lacks systematic studies. In this paper, we study the evolution of the physical properties of LSCO thin films upon exposure to highly reducing environments. We observe the rarely reported crystalline Ruddlesden-Popper phase, which involves the loss of both oxygen anions and cobalt cations upon annealing where the cobalt is found as isolated Co ions or Co nanoparticles. First-principles calculations confirm that the concurrent loss of oxygen and cobalt ions is thermodynamically possible through an intermediary BM phase. The strong correlation of the magnetic and electronic properties to the crystal structure highlights the potential of utilizing ion migration as a basis for emerging applications such as neuromorphic computing.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Air Force Research Laboratory (AFRL) - Air Force Office of Scientific Research (AFOSR); USDOE Office of Science - Energy Frontier Research Center; USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1868556
Journal Information:
Physical Review Materials, Vol. 5, Issue 6
Country of Publication:
United States
Language:
English

References (66)

Voltage-Controlled Topotactic Phase Transition in Thin-Film SrCoO x Monitored by In Situ X-ray Diffraction journal January 2016
Ionic transport in hybrid lead iodide perovskite solar cells journal June 2015
Beyond electrostatic modification: design and discovery of functional oxide phases via ionic-electronic doping journal October 2018
Structural similarities among oxygen-deficient perovskites journal February 1993
Synthesis and Structural Characterization of La 1− x A x MnO 2.5 (A = Ba, Sr, Ca) Phases: Mapping the Variants of the Brownmillerite Structure journal November 2009
Morphology, structure, and nucleation of out-of-phase boundaries (OPBs) in epitaxial films of layered oxides journal June 2007
Topotactic phase transformations by concerted dual-ion migration of B-site cation and oxygen in multivalent cobaltite La–Sr–Co–Ox films journal December 2020
Arranging strategies for A-site cations: impact on the stability and carrier migration of hybrid perovskite materials journal January 2020
Strong Effect of B-Site Substitution on the Reactivity of Layered Perovskite Oxides Probed via Isopropanol Conversion journal July 2019
Topotactic Phase Transformation of the Brownmillerite SrCoO 2.5 to the Perovskite SrCoO 3- δ journal July 2013
Reversible redox reactions in an epitaxially stabilized SrCoOx oxygen sponge journal August 2013
Electrostatic versus Electrochemical Doping and Control of Ferromagnetism in Ion-Gel-Gated Ultrathin La 0.5 Sr 0.5 CoO 3−δ journal July 2016
Ionic tuning of cobaltites at the nanoscale journal October 2018
X-ray nanodiffraction studies of ionically controlled nanoscale phase separation in cobaltites journal August 2019
Reversible control of magnetism in La 0.67 Sr 0.33 MnO 3 through chemically-induced oxygen migration journal February 2016
Interfacial-Redox-Induced Tuning of Superconductivity in YBa 2 Cu 3 O 7-δ journal December 2019
Electric-field control of tri-state phase transformation with a selective dual-ion switch journal May 2017
Topotactic Phase Transition Driving Memristive Behavior journal August 2019
Square planar coordinate iron oxides journal January 2012
Reduction and oxidation of SrCoO2.5 thin films at low temperatures journal January 2012
Infinite-layer iron oxide with a square-planar coordination journal December 2007
Atomic-resolution imaging of electrically induced oxygen vacancy migration and phase transformation in SrCoO2.5-σ journal July 2017
Correlation induced half-metallicity in a ferromagnetic single-layered compound: Sr 2 CoO 4 journal January 2010
Magnetization and magneto-transport staircaselike behavior in layered perovskite Sr2CoO4 at low temperature journal June 2016
Intergranular Giant Magnetoresistance in a Spontaneously Phase Separated Perovskite Oxide journal January 2005
Perovskite Oxide for Solid Oxide Fuel Cells book January 2009
Controlling Metal–Insulator Transitions in Vanadium Oxide Thin Films by Modifying Oxygen Stoichiometry journal December 2020
GenX : an extensible X-ray reflectivity refinement program utilizing differential evolution journal November 2007
Exchange coupling in (111)-oriented L a 0.7 S r 0.3 Mn O 3 / L a 0.7 S r 0.3 Fe O 3 superlattices journal September 2015
Intrinsic luminescence excitation spectrum and extended x-ray absorption fine structure above the K edge in Ca F 2 journal February 1978
Advanced capabilities for materials modelling with Quantum ESPRESSO journal October 2017
QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials journal September 2009
Understanding the metal-to-insulator transition in La1−xSrxCoO3−δ and its applications for neuromorphic computing journal November 2020
Generalized Gradient Approximation Made Simple journal October 1996
Pseudopotentials periodic table: From H to Pu journal December 2014
Commentary: The Materials Project: A materials genome approach to accelerating materials innovation journal July 2013
Special points for Brillouin-zone integrations journal June 1976
Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films journal January 2019
Modified Oxygen Defect Chemistry at Transition Metal Oxide Heterostructures Probed by Hard X-ray Photoelectron Spectroscopy and X-ray Diffraction journal April 2018
Thermal and Chemical Expansion of Sr-Doped Lanthanum Cobalt Oxide (La 1 - x Sr x CoO 3 - δ ) journal August 2005
Cobalt nanoparticles for biomedical applications: Facile synthesis, physiochemical characterization, cytotoxicity behavior and biocompatibility journal August 2017
In situ non-aqueous nucleation and growth of next generation rare-earth-free permanent magnets journal January 2015

Assessing Cobalt Metal Nanoparticles Uptake by Cancer Cells Using Live Raman Spectroscopy

journal January 2020
In situ exsolution of Ni particles on the PrBaMn 2 O 5 SOFC electrode material monitored by high temperature neutron powder diffraction under hydrogen journal January 2020
Enhancing Electrode Performance by Exsolved Nanoparticles: A Superior Cobalt-Free Perovskite Electrocatalyst for Solid Oxide Fuel Cells journal December 2016
Absorption and luminescence of tetrahedral Co2+ ion in MgAl2O4 journal August 1993
Structural and photoluminescence studies of Co2+ doped Ca–Li hydroxyapatite nanopowders journal June 2015
Optical constants, band gap, and infrared-active phonons of (LaAlO 3 ) 0.3 (Sr 2 AlTaO 6 ) 0.35 (LSAT) from spectroscopic ellipsometry
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journal September 2016
Magnetism at spinel thin film interfaces probed through soft X-ray spectroscopy techniques journal October 2010
Controlling Magnetization Vector Depth Profiles of La 0.7 Sr 0.3 CoO 3 /La 0.7 Sr 0.3 MnO 3 Exchange Spring Bilayers via Interface Reconstruction journal August 2020
X-ray absorption and magnetic circular dichroism of LaCoO 3 , La 0.7 Ce 0.3 CoO 3 , and La 0.7 Sr 0.3 CoO 3 films: Evidence for cobalt-valence-dependent magnetism journal November 2010
High-spin ground states via electron delocalization in mixed-valence imidazolate-bridged divanadium complexes journal March 2010
Strongly Coupled Magnetic and Electronic Transitions in Multivalent Strontium Cobaltites journal November 2017
Insulating Ferromagnetic LaCoO 3 δ Films: A Phase Induced by Ordering of Oxygen Vacancies journal February 2014
Magnetic, Structural, and Chemical Properties of Cobalt Nanoparticles Synthesized in Ionic Liquids journal May 2018
Synthesis and characterisation of ferromagnetic hexagonal cobalt nanoparticles journal February 2013
( Sr , Na ) ( Zn , Mn ) 2 As 2 : A diluted ferromagnetic semiconductor with the hexagonal CaAl 2 Si 2 type structure journal October 2014
Pressure dependence of Curie temperature and resistivity in complex Heusler alloys journal November 2011
Highly thermal-stable ferromagnetism by a natural composite journal January 2017
Impact of niobium doping upon the magnetotransport properties of the oxygen-deficient perovskite SrCo1−xNbxO3−δ journal May 2005
Crystallographic and magnetic structure of SrCoO 2.5 brownmillerite: Neutron study coupled with band-structure calculations journal August 2008
Experimental proof of magnetic x-ray dichroism journal November 1986
Influence of crystal field on anisotropic x-ray magnetic linear dichroism at the Co 2 + L 2 , 3 edges journal February 2008
Sign dependence of the x-ray magnetic linear dichroism on the antiferromagnetic spin axis in La Fe O 3 thin films journal January 2006
Magnetic Field-Assisted Gene Delivery: Achievements and Therapeutic Potential journal March 2012
Magnetic properties of polycrystalline cobalt nanoparticles journal April 2017

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