Oxygen thermomigration in acceptor-doped perovskite

文献情報

出版日 2017-04-19

DOI 10.1039/C7CP00384F

インパクトファクター 3.676

著者

Donghoon Shin, Han-Ill Yoo

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要旨

The recent proposal of possible oxygen-thermomigration as a plausible mechanism for unipolar resistive switching of oxide memristors is now widely employed in modelling or simulating their memristive function on the grounds of the conventional picture that the mobile component O is always thermophobic, with its reduced heat-of-transport being equal to its migrational enthalpy (qO* = ΔHm > 0). At 1000 °C, we measured the thermomigration of mobile-component O in a prototype memristive perovskite, CaTi0.90Sc0.10O2.95+δ, across its near-stoichiometric regime (δ ≈ 0), where oxygen vacancy concentration is essentially fixed by doping acceptor impurities (i.e., ). It has been found that the reduced heat-of-transport of mobile O (qO*) varies systematically in the range of −2 < qO*/eV ≤ +2, as the composition varies from hypo-(δ < 0) to hyper-stoichiometry (δ > 0), exhibiting a sign reversal or thermomigration direction change from thermophilic (qO* < 0) to thermophobic (qO* > 0). This sign-reversal is attributed to the change in the electronic ambipolar company of from electrons to holes crossing the stoichiometric composition δ = 0. The numerical data for qO* together with the measurement details are reported.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

Oxygen thermomigration in acceptor-doped perovskite

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