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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	Revealing strain effects on the chemical composition of perovskite oxide thin films surface, bulk, and interfaces Celeste A. M. Van Den Bosch , Andrea Cavallaro , Roberto Moreno , Giannantonio Cibin , Gwilherm Kerherve , José M. Caicedo , Thomas K. Lippert , Max Doebeli , José Santiso , Stephen J. Skinner , Ainara Aguadero Advanced Materials Interfaces 247 DOI: 10.1002/admi.201901440 Diamond Proposal Number(s): [13530, 16839] Show Abstract ▼ Abstract: Understanding the effects of lattice strain on oxygen surface and diffusion kinetics in oxides is a controversial subject that is critical for developing efficient energy storage and conversion materials. In this work, high‐quality epitaxial thin films of the model perovskite La0.5Sr0.5Mn0.5Co0.5O3−δ (LSMC), under compressive or tensile strain, are characterized with a combination of in situ and ex situ bulk and surface‐sensitive techniques. The results demonstrate a nonlinear correlation of mechanical and chemical properties as a function of the operation conditions. It is observed that the effect of strain on reducibility is dependent on the “effective strain” induced on the chemical bonds. In‐plain strain, and in particular the relative BO length bond, is the key factor controlling which of the B‐site cation can be reduced preferentially. Furthermore, the need to use a set of complimentary techniques to isolate different chemically induced strain effects is proven. With this, it is confirmed that tensile strain favors the stabilization of a more reduced lattice, accompanied by greater segregation of strontium secondary phases and a decrease of oxygen exchange kinetics on LSMC thin films.	Dec 2019
I07-Surface & interface diffraction	Understanding surface structure and chemistry of single crystal lanthanum aluminate Stevin S. Pramana , Andrea Cavallaro , Jiahui Qi , Chris L. Nicklin , Mary P. Ryan , Stephen J. Skinner Scientific Reports 7 DOI: 10.1038/srep43721 Diamond Proposal Number(s): [11597] Open Access Show Abstract ▼ Abstract: The surface crystallography and chemistry of a LaAlO3 single crystal, a material mainly used as a substrate to deposit technologically important thin films (e.g. for superconducting and magnetic devices), was analysed using surface X-ray diffraction and low energy ion scattering spectroscopy. The surface was determined to be terminated by Al-O species, and was significantly different from the idealised bulk structure. Termination reversal was not observed at higher temperature (600 °C) and chamber pressure of 10−10 Torr, but rather an increased Al-O occupancy occurred, which was accompanied by a larger outwards relaxation of Al from the bulk positions. Changing the oxygen pressure to 10−6 Torr enriched the Al site occupancy fraction at the outermost surface from 0.245(10) to 0.325(9). In contrast the LaO, which is located at the next sub-surface atomic layer, showed no chemical enrichment and the structural relaxation was lower than for the top AlO2 layer. Knowledge of the surface structure will aid the understanding of how and which type of interface will be formed when LaAlO3 is used as a substrate as a function of temperature and pressure, and so lead to improved design of device structures.	Mar 2017

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