Soft chemistry synthesis and dielectric properties of A-site deficient perovskite-type compound La 2/3 TiO 3−δ

Bugrov, Alexander N.; Abdulaeva, Liliia D.; Silyukov, Oleg I.; Burovikhina, Alena A.; Латышева, Е. Н.; Manucharov, Yu. S.; Zvereva, Irina A.

doi:10.1016/j.ceramint.2015.09.125

Cited by 14 publications

(3 citation statements)

References 34 publications

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“…While La 2/3 TiO 3 may not be of interest as a piezoelectric material, it has been explored as a microwave dielectric with promising properties 23–25 . La 2/3 TiO 3 is also the parent compound of ionic 22 and lithium ion 26 conductors.…”

Section: Resultsmentioning

confidence: 99%

“…La 2/3 TiO 3 is also the parent compound of ionic 22 and lithium ion 26 conductors. The orthorhombic structure of La 2/3 TiO 3 , with ordered A-site cation vacancies, is difficult to stabilize in bulk form without the addition of dopant cations 23,25 . Epitaxial stabilization of undoped La 2/3 TiO 3 on TiO 2 (110) is a promising route to realize pure La 2/3 TiO 3 for both fundamental studies and device applications.…”

Section: Resultsmentioning

confidence: 99%

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Tuning piezoelectric properties through epitaxy of La2Ti2O7 and related thin films

Kaspar

Hong

Bowden

et al. 2018

Sci Rep

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Current piezoelectric sensors and actuators are limited to operating temperatures less than ~200 °C due to the low Curie temperature of the piezoelectric material. Strengthening the piezoelectric coupling of high-temperature piezoelectric materials, such as La2Ti2O7 (LTO), would allow sensors to operate across a broad temperature range. The crystalline orientation and piezoelectric coupling direction of LTO thin films can be controlled by epitaxial matching to SrTiO3(001), SrTiO3(110), and rutile TiO2(110) substrates via pulsed laser deposition. The structure and phase purity of the films are investigated by x-ray diffraction and scanning transmission electron microscopy. Piezoresponse force microscopy is used to measure the in-plane and out-of-plane piezoelectric coupling in the films. The strength of the out-of-plane piezoelectric coupling can be increased when the piezoelectric direction is rotated partially out-of-plane via epitaxy. The strongest out-of-plane coupling is observed for LTO/STO(001). Deposition on TiO2(110) results in epitaxial La2/3TiO3, an orthorhombic perovskite of interest as a microwave dielectric material and an ion conductor. La2/3TiO3 can be difficult to stabilize in bulk form, and epitaxial stabilization on TiO2(110) is a promising route to realize La2/3TiO3 for both fundamental studies and device applications. Overall, these results confirm that control of the crystalline orientation of epitaxial LTO-based materials can govern the resulting functional properties.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Tuning piezoelectric properties through epitaxy of La2Ti2O7 and related thin films

Kaspar

Hong

Bowden

et al. 2018

Sci Rep

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“…A number of factors contribute to the enhanced ORR catalytic activity of LaMnO 3 -based perovskites, including the conducting additive species' oxygen absorption behavior, electronic conductivity, intrinsic activity, and the element vacancy content . In perovskites, the A-site deficiencies alter the element valence at the B-site, increase the surface oxygen vacancies, reduce the oxygen migration energy, and expose more active sites for ORR. − By substituting La with Sr in La 1– x Sr x MnO 3 (LSM) perovskites, one can alter the manganese valence state which enhances the ORR activity of the prepared catalyst …”

Section: Introductionmentioning

confidence: 99%

Optimization of Praseodymium-Based Perovskites as Electrocatalysts for Oxygen Reduction Reaction

Nayak,

Soren,

Hota

et al. 2023

ACS Appl. Energy Mater.

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Praseodymium-based perovskites Pr 1−x Sr x MnO 3 (x = 0.1, 0.2, 0.3, 0.4), denoted as PSM-0.9, PSM-0.8, PSM-0.7, and PSM-0.6, respectively, are prepared by the sol−gel method. The structural properties and morphology of the as-prepared catalysts are studied with the help of XRD, SEM, TEM, and XPS. The prepared catalysts were tested for their oxygen reduction reaction (ORR) activities in an alkaline medium. Among the prepared catalysts, PSM-0.7, with the onset potential of −0.02 V, is found to be the most active ORR catalyst. The number of electron transfer, n= 4, for PSM-0.7, was calculated using the Koutechy−Levich plot acquired from a rotating disk electrode. Further, the lower Tafel slope of the PSM-0.7 catalyst justifies its higher catalytic activity. The higher catalytic activity of PSM-0.7 having moderate A-site Sr doping is ascribed to the oxygen vacancies and Mn 4+ concentration, as confirmed by XPS analysis. The chronoamperometric results confirmed that the PSM-0.7 electrocatalyst has higher durability and methanol-tolerant ability compared to commercial Pt/C.

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Experimental investigation and modelling of the Na+ mobility in NaLnTiO4 (Ln = La, Nd) ceramics

Petrov

Mel’nikova

Silyukov

et al. 2017

Ceramics International

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Soft chemistry synthesis and dielectric properties of A-site deficient perovskite-type compound La 2/3 TiO 3−δ

Cited by 14 publications

References 34 publications

Tuning piezoelectric properties through epitaxy of La2Ti2O7 and related thin films

Tuning piezoelectric properties through epitaxy of La2Ti2O7 and related thin films

Optimization of Praseodymium-Based Perovskites as Electrocatalysts for Oxygen Reduction Reaction

Experimental investigation and modelling of the Na+ mobility in NaLnTiO4 (Ln = La, Nd) ceramics

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