Phase evolution and mechanical properties of novel nanocrystalline Y2(TiZrHfMoV)2O7 high entropy pyrochlore

Karthick, G.; Raman, Lavanya; Murty, B.S.

doi:10.1016/j.jmst.2020.12.025

Cited by 26 publications

(4 citation statements)

References 42 publications

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“…In oxygen-deficient regions, the higher binding energy peak is attributed to O 2− , indicating the presence of oxygen vacancies in the ZCFLO film. [31,32] More oxygen vacancies in Zn 0.87 Cu 0.05 (Fe 0.04 Li 0.04 )O film than that in pure ZnO film is attributed to the Cu(I) formation being promoted. Thus, the Fe 3+ -Li + ionic pairs are polarized in the absence of an external electric field as a result of the weak electric field generated by the oxygen and zinc vacancies, leading to the formation of upward self-polarized ferroelectric films.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Fill Factor and Power Conversion Efficiency of Single Oxide Ferroelectric Photovoltaic Devices with Designed Nanostructures

Gao

Jing

et al. 2023

Adv Funct Materials

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The ferroelectric photovoltaic effect has promising potential for the next generation of solar cells. However, due to disadvantages such as wide bandgap and low fill factor (FF), the power conversion efficiency (PCE) values reported in ferroelectric photovoltaic devices remain considerably below expectations. Herein, enhanced photovoltaic effect in the films with the nanostructure of ferroelectric nanocrystalline particles embedded in the amorphous or poor crystalline matrix is investigated. The nanostructures are realized by controlled crystallization and doping in Zn0.92‐xCux(Fe0.04Li0.04)O (ZCFLO) films. Benefiting from the improved carrier dynamic regulation in ferroelectric/boundary nanostructures and narrowed bandgap, the designed ZCFLO photoferroelectrics films exhibit high efficiency photovoltaic effect under AM 1.5G light, manifesting above‐bandgap photovoltage, markedly improved FF (83.4%), switchable photoresponse (50.3 mA W−1), and high PCE (14.4%). Meanwhile, the simple method presented in this work is fully compatible with large‐scale manufacturing processes and may find applications in cost‐efficiency optoelectronic devices.

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Section: Resultsmentioning

confidence: 99%

Enhanced Fill Factor and Power Conversion Efficiency of Single Oxide Ferroelectric Photovoltaic Devices with Designed Nanostructures

Gao

Jing

et al. 2023

Adv Funct Materials

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“…We already applied this approach recently to form Dy 2 (TiZrHfGeSn) 2 O 7 , leading to the first entropy‐stabilized pyrochlore 8 . To the best of our knowledge, since then the reported high‐entropy pyrochlores with chemical disorder introduced on the B site are RE 2 (TiZrHfSn) 2 O 7 (RE = Sm or Gd) 15,16 ; Y 2 (TiZrHfMoV) 2 O 7 , Y 2 (TiZrHfV) 2 O 7 , and Y 2 (TiZrHfMo) 2 O 7 17 ; RE 2 (ZrHfSnScNb) 2 O 7 and RE 2 (ZrHfSnScTa) 2 O 7 (RE = La or Nd) 18 ; and the two distorted pyrochlores Nd 2 (ZrHfSnScTa) 2 O 7 and Nd 2 (ZrHfSnTiNb) 2 O 7 19 . Very recently, Jia et al.…”

Section: Introductionmentioning

confidence: 93%

Investigation of the chemical versatility in high‐entropy pyrochlores

et al. 2022

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This article reports on the exploration of the chemical versatility of entropy‐stabilized pyrochlores (A2B2O7) with large chemical disorder introduced on the B site, as well as the study of isovalent and aliovalent substitution on the B site and of Ca2+‐doping on the A site. Among all the 20 new compounds obtained in this study, 8 are entropy‐stabilized: RE2(TiZrHfGeSn)2 (with RE = Gd–Ho and Y), Pr2(TiZrHfScNb)2O7, and RE2(TiGeSnAlNb)2O7 (with RE = Er and Y). Moreover, some physical properties (magnetic, electrical, thermal, and optical properties) of these high‐entropy pyrochlores have been screened, and some of them could be potentially interesting for applications. For example, we observed low thermal diffusivity values (between 0.4 and 0.7 m2 s−1) making them interesting for thermal barrier coating or tunable optical bandgaps in the visible region that could make them appealing as photocatalysts or in optical applications. Furthermore, single‐phased compounds were obtained for almost all the rare earths (REs) on the A site. Therefore, when five nonmagnetic cations are used for the B site, it enables to study the magnetic properties and, more specifically, the influence of the local chemical and structural disorder on the exotic ground states observed in monocationic RE pyrochlores.

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“…1,2 These materials were discovered when Rost et al 3 extended the high-entropy alloy concept (Cantor et al , 4 and Yeh et al 5 ) to ionic bonded ceramics and synthesized the first entropy-stabilized oxide, (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )O with a rock-salt structure, which drove an impetus in materials science research based on ceramics. It was followed by the findings of new high-entropy materials with different crystal structures which include fluorite, 6,7 spinels, 8–10 bixbyite, 11 perovskites, 12 rutile, 13 pyrochlore, 14–16 etc. These high-entropy oxides show interesting physical properties such as large lithium-ion conductivity, 17 ultralow thermal conductivity, 18 improved figure of merit for thermoelectrics, 19 exotic magnetic ordering, 10,20 colossal dielectric constant, 21 proton conductivity, 22 photocatalysis, 23,24 etc.…”

Section: Introductionmentioning

confidence: 99%