The Importance of <i>In Situ</i> Monitors in the Preparation of Layered Oxide Heterostructures by Reactive MBE

Schlom, Darrell G.; Haenit, J.H.; Theis, C. D.; Tian, Wei; Pan, X. Q.; Brown, Geoffrey W.; Hawley, M. E.

doi:10.1557/proc-619-105

Cited by 2 publications

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“…Table shows that the reaction energies to form successive Ruddlesden–Popper phases are reduced as n increases, with the implication that the phases with increasing n will become progressively less stable and more difficult to synthesize. This proves to be the case, with the higher phases required to be grown epitaxially and with great care required to be taken in the process …”

Section: Resultsmentioning

confidence: 99%

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Systematic Thermodynamics of Layered Perovskites: Ruddlesden–Popper Phases

Glasser

2017

Inorg. Chem.

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Perovskite, CaTiO, is the prototype of an extensive group of materials. They are capable of considerable chemical modification, with the further capability of undergoing structural modification by the intercalation of thin sheets of intrusive materials (both inorganic and organic) between the cubic perovskite layers, to form a range of "layered" perovskites. These changes bring about alterations in their electronic, structural, and other properties, permitting some "tuning" toward specific ends. This paper collects the limited known thermodynamic data for layered perovskites of various chemical compositions and demonstrates by example that the thermodynamic layer values are substantially additive. This additivity may be exploited by summing properties of the constituent oxides, by adding differences between adjacent compositions within a series, or even by substitution of oxides for one another, thus permitting prediction beyond the known range of compositions. Strict additivity implies full reversibility so that the additive product may be unstable and may undergo structural changes, producing materials with new and potentially useful properties such as ferroelectricity, polarity, giant magnetoresistance, and superconductivity.

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Section: Resultsmentioning

confidence: 99%

“…This proves to be the case, with the higher phases required to be grown epitaxially and with great care required to be taken in the process. 41…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Systematic Thermodynamics of Layered Perovskites: Ruddlesden–Popper Phases

Glasser

2017

Inorg. Chem.

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Role of step edges in oxygen vacancy transport into SrTiO3(001)

Zhu

Fei

et al. 2005

Applied Physics Letters

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Using a combination of oblique-incidence optical reflectivity difference and specular reflection high energy electron diffraction techniques, we studied vacuum annealing of pulsed-laser deposited Nb-doped SrTiO 3 monolayers on SrTiO 3 ͑100͒ near 730°C. In oxygen-free ambient, the as-grown monolayers are oxygen deficient. The excess oxygen vacancies in the monolayers are reduced by vacancy diffusion into the bulk. We found that the reduction rate is characterized by an activation energy E = 1.0 eV. More interestingly, the pre-exponential factor decreases significantly as the annealing time interval increases between two successive monolayer depositions. We propose that the indiffusion of excess surface oxygen vacancies takes place at step edges, and the Oswald ripening governs the density of the latter during vacuum annealing.

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The Importance of In Situ Monitors in the Preparation of Layered Oxide Heterostructures by Reactive MBE

Abstract: Using a variety of in situ monitors and when possible adsorption-controlled growth conditions, layered oxide heterostructures including new compounds and metastable superlattices have been grown by reactive molecular beam epitaxy (MBE).

Cited by 2 publications

References 23 publications

Systematic Thermodynamics of Layered Perovskites: Ruddlesden–Popper Phases

Systematic Thermodynamics of Layered Perovskites: Ruddlesden–Popper Phases

Role of step edges in oxygen vacancy transport into SrTiO3(001)

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