Results 11 to 20 of about 476 (168)

Sub-nanometer depth resolution and single dopant visualization achieved by tilt-coupled multislice electron ptychography [PDF]

Nature Communications
Real-space, three-dimensional imaging of atomic structures in materials science is a critical yet challenging task. Although scanning transmission electron microscopy has achieved sub-angstrom lateral resolution through techniques like electron ...
Zehao Dong, Yang Zhang, Chun-Chien Chiu, Sicheng Lu, Jianbing Zhang, Yu-Chen Liu, Suya Liu, Jan-Chi Yang, Pu Yu, Yayu Wang, Zhen Chen   +10 more
doaj   +2 more sources

Hydration and carbonation curing of high ferrite clinker (FePC) synthesized using EAF slag [PDF]

Low-Carbon Materials and Green Construction
This study explores the use of Electric Arc Furnace (EAF) slag as a sustainable alternative raw material in cement clinker production. The research demonstrates the synthesis of ferrite-rich clinker using EAF slag, achieving a clinker composition of 47 ...
Elijah Adesanya, Visa Isteri, Aniruddha Baral, Christiane Rößler, Theodore Hanein, Juho Yliniemi   +5 more
doaj   +2 more sources

The Coupling of Ferroelectric Polarization and Oxygen Vacancy Migration Enables Electrically Controlled Thermal Memories. [PDF]

Adv Mater
Ferroelectric Hf0.5Zr0.5O2 epitaxial thin films exhibit a non‐volatile, electrically controlled thermal conductivity enabled by the coupling between oxygen vacancy migration, acting as phonon scatterers, and ferroelectric polarization, acting as ion migration valve.
Barneo D, Royo M, Ramos R, Carrete J, Romero-Bernad H, Jiménez R, Leborán V, Magén C, Varela-Domínguez N, Algueró M, Rurali R, Pardo JA, Rivadulla F, Langenberg E.   +13 more
europepmc   +2 more sources

Topotactic Phase Transition in Epitaxial La_0.7Sr_0.3MnO_3-δ Films Induced by Oxygen Getter Assisted Thermal Annealing. [PDF]

Small
The perovskite to brownmillerite topotactic phase transition in La0.7Sr0.3MnO3‐δ thin films is achieved through a simple and efficient thermal vacuum annealing that employs bulk aluminum as an active oxygen getter. STEM reveals surface segregation and cation redistribution, while EELS identifies distinct manganese oxidation states across different ...
Yin C, Cao L, Bai X, He S, Zhang H, Duchoň T, Gunkel F, Zhou Y, Wang M, Kaus A, Jo J, Dunin-Borkowski RE, Zhou S, Brückel T, Petracic O.   +14 more
europepmc   +2 more sources

Effects of Cr Doping and Water Content on the Crystal Structure Transitions of Ba₂In₂O₅

Crystals, 2021
Temperature-dependent crystal structure alterations in the brownmillerite-type material Ba2In2O5 play a fundamental role in its applications: (i) photocatalytic CO2 conversion; (ii) oxygen transport membranes; and (iii) proton conduction.
Raphael Finger, Marc Widenmeyer, Thomas C. Hansen, Dirk Wallacher, Stanislav Savvin, Marko Bertmer, Anke Weidenkaff, Holger Kohlmann   +7 more
doaj   +1 more source

Scalable Electrochemical Concrete Fabrication and Closed-Loop Recycling. [PDF]

Adv Sci (Weinh)
The electrochemical‐driven recycling strategy establishes a reversible concrete material flow by extracting Ca, Si, Al, and Fe from concrete waste and regenerating functional feedstocks. These reversed products are reassembled into new concrete, which re‐enters service and ultimately returns to waste, enabling a closed‐loop, waste‐origin, and low ...
Lyu H, Li Z, Liu Y, Zhu L, Hao L, Shi M, Zhang S, Poon CS.   +7 more
europepmc   +2 more sources

Investigation of Grain, Grain Boundary, and Interface Contributions on the Impedance of Ca₂FeO₅

Applied Sciences, 2022
Conductivity properties such as the impedance contributions of grain, grain boundary, and electrode–material interface of brownmillerite-type Ca2Fe2O5 are studied using alternate current (AC) impedance at different temperatures over a wide range of ...
Ram Krishna Hona, Gurjot S. Dhaliwal, Rajesh Thapa   +2 more
doaj   +1 more source

Quantitative Control of Oxygen Non-Stoichiometry and Negative Raman Chemical Shift During Topotactic Phase Transition in a Ca-Doped BiFeO₃ Thin-Film. [PDF]

Adv Sci (Weinh)
In an electrochemical titration cell utilizing a Ca‐doped BiFeO3 film, the oxygen stoichiometry was quantitatively controlled via electrical oxygen pumping. The structural and chemical changes were monitored through Raman spectroscopy and X‐ray diffraction.
Park HS, Cheon S, Kwon YJ, Kang M, Suh J, Park SY, Yang Y, Yang CH.   +7 more
europepmc   +2 more sources

Stacking faults and superstructures in a layered brownmillerite [PDF]

Acta Crystallographica Section B Structural Science, 2011
Single crystals of Ca4Fe2Mn0.5Ti0.5O9 have been synthesized using a flux method. The structural characterization using single-crystal X-ray diffraction revealed the space group Amma and unit-cell dimensions of a = 5.3510 (6), b = 26.669 (3), c = 5.4914 (6) Å. The structure is isotypic with Sr3NdFe3O9 [Barrier et al. (2005). Chem. Mater.
Kruger, Hannes, Stöber, S, Welberry, Thomas, Withers, Raymond, Fitz Gerald, John   +4 more
openaire   +3 more sources

Magnesium doping on brownmillerite Ca2FeAlO5 [PDF]

Journal of Solid State Chemistry, 2007
Abstract Ca2FeAl1−xMgxO5 (x=0, 0.05 and 0.1) compounds adopting the brownmillerite-type structure were prepared by a self-combustion route using two different fuels. Characterisation was performed using X-ray powder diffraction, Mossbauer spectroscopy, magnetisation measurements, chemical analysis, scanning electron microscopy and 4-point dc ...
Malveiro, J., Ramos, T., Ferreira, L. P., Waerenborgh, J. C., Nunes, M. R., Godinho, M., Carvalho, M. D.   +6 more
openaire   +2 more sources