Oxygen activation on Ba-containing perovskite materials

Zhu, Yue; Liu, Dongdong; Jing, Huijuan; Zhang, Fei; Zhang, Xiaoben; Hu, Shiqing; Zhang, Liming; Wang, Jingyi; Zhang, Lixiao; Zhang, Wenhao; Pang, Beibei; Zhang, Peng; Fan, Fengtao; Xiao, Jianping; Liu, Wei; Zhu, Xuefeng; Yang, Weishen

doi:10.1126/sciadv.abn4072

Cited by 50 publications

(36 citation statements)

References 81 publications

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“…As in other perovskite materials, such as SrTiO 3 , segregation of BaO might have been expected. Such a process would have resulted in an increase in Ba on the surface changes [ 28 ]. However, O 1s spectra revealed different chemical species and showed that both Ba and Sn spectra might be the result of increasing oxygen deficiency and the difference in cation chemical surroundings, as well as the experimental conditions [ 29 ].…”

Section: Resultsmentioning

confidence: 99%

Structure Modification, Evolution, and Compositional Changes of Highly Conductive La:BaSnO3 Thin Films Annealed in Vacuum and Air Atmosphere

et al. 2022

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Perovskite-type La:BaSnO3 (LBSO) has been drawing considerable attention due to its high electron mobility and optical transparency. Its thin film electrical properties, however, remain inferior to those of single crystals. This work investigates the thermal post-treatment process of films deposited using the metalorganic chemical vapor deposition method to improve the electrical properties of different stoichiometry films, and demonstrates the modification of thin film’s structural properties using short and excessive annealing durations in vacuum conditions. Using vacuum post-treatment, we demonstrate the improvement of electrical properties in Ba-rich, near-stoichiometric, and Sn-rich samples with a maximum electron mobility of 116 cm2V−1s−1 at r.t. However, the improvement of electrical properties causes surface morphology and internal structural changes, which depend on thin film composition. At temperatures of 900 °C–1400 °C the volatile nature of LBSO constituting elements is described, which reveals possible deterioration mechanisms of thin LBSO air. At higher than 1200 °C, LBSO film’s decomposition rate increases exponentially. Thin film structure evolution and previously unreported decomposition is demonstrated by Ba and La diffusion to the substrate, and by evaporation of SnO-SnOx species.

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Section: Resultsmentioning

confidence: 99%

Structure Modification, Evolution, and Compositional Changes of Highly Conductive La:BaSnO3 Thin Films Annealed in Vacuum and Air Atmosphere

et al. 2022

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“…XRD patterns evidence for the BSMWO-I sample an amorphous structure and for the sample BSMWO-II a nanocrystalline structure containing the XRD peaks typical for the face-centered cubic structure of BaSrMgWO6 and some impurity XRD peaks, located at 2 values of 26.70 º and 27.49 º respectively (noted with * and ** respectively in Figure 1), that generally are attributed to some impurity phases like MeWO4 and Me2WO5 (Me=Ba, Sr, Mg). The presence of some BaO2, SrO2 and MgO phases that may have a contribution to these XRD peaks may be caused by the formation of some under-stoichiometric phases [25][26][27][28][29][30].…”

Section: Structural Investigationmentioning

confidence: 99%

“…As the coordination of negative ions is higher the local electron potential increases and the binding energy decreases [39]. In the stoichiometric perovskite structure Ba is 12-fold and, in the under-stoichiometric structure and in peroxide structure is 10-fold, so the binding energy of Ba 2+ in cubic double perovskite structure will be lower than Ba 2+ in under-stoichiometric Ba2-(x+y) SrxMgy WO5 structure or in tetragonal BaO2 [26,33,40]. The attribution of the peaks with higher binding energy to BaO2 agrees with the results obtained by other authors [33].…”

Section: Chemical Statesmentioning

confidence: 99%

Studies on the Structure and Optical Properties of BaSrMgWO<sub>6</sub> Thin Films Deposited by A Spin Coating Method

Punga¹,

Abbassi²,

Toma³

et al. 2022

Preprint

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Highly transparent thin films with the chemical formula BaSrMgWO6 were deposited by spin coating using a solution of nitrates of Ba, Sr and Mg and ammonium paratungstate in dimethylformamide with a ratio Ba:Sr:Mg;W=1:1:1:1. XRD, SEM, EDX and XPS investigations evidenced that an annealing at 800 ºC for 1h leaves the structure amorphous with a precipitate on the surface and that a supplementary annealing at 850 ºC for 45 min forms a nanocrystalline structure and dissolves a part of precipitates. It was evidenced a textured double perovskite cubic structure (61.9%) decorated with tetragonal and cubic impurity phases (12.7 %) like BaO2, SrO2 and MgO and an under-stoichiometric phase (24.4%) with the chemical formula Ba2-(x+y) SrxMgyWO5. From transmittance measurements the values of optical band gap were estimated for the amorphous (Eg= 5.15) and nanocrystalline (Eg=4.58 eV) phases. The presence of a lattice disorder was indicated by the high values of Urbach and weak absorption tail energies A decrease in their values was observed and attributed to the crystallization process and cation redistribution.

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“…Up to now, kinds of UCNPs with different controllable shapes and sizes have been synthesized through hydro‐ and solvothermal methods [ 87–94 ] as well as by thermal decomposition [ 30,95–98 ] and chemical coprecipitation. [ 99–101 ] The luminescence efficiency of the resulting materials was improved significantly by fabricating UCNPs with core–shell structure within one single nanoparticle. [ 37,41,64,102–104 ] Despite these great achievements, designs of currently developed UCNPs must be delicately laid out to take into account their compositions and complex structures.…”

Section: Properties Of Upconversion Nanoparticlesmentioning

confidence: 99%

Self‐Assembly of Upconversion Nanoparticles Based Materials and Their Emerging Applications

Zhang

Chen

Zhang

2021

Small

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to photodynamic therapy (PDT), [12][13][14][15][16][17][18] drug delivery, [19][20][21][22][23][24][25][26] molecular detection, [27][28][29][30][31] optogenetics, [32][33][34] etc. On the other side, broader applications of UCNPs are hindered by their low extinction coefficients and quantum efficiency as well as fixed energy levels. [1,[35][36] Moreover, various energy transfer paths among these lanthanide cations often result in deleterious cross-relaxations. Thus, specific multiplexed applications require compositional and structural UCNPs design to be delicate and complex. The creation of such structures is multi-step and timeconsuming. [7,19,[37][38][39][40][41] To resolve these problems, scientists tried to develop UCNPs assemblies containing various UCNPs or UCNPs and other functional counterparts. The resulting composites exhibited unique properties, determined by the dimension and morphology of the individual components and the whole assembly. These properties can also be tuned depending upon the application situation such as dual-modality cell imaging, [26,[42][43] drug delivery, [44][45][46][47][48][49] molecular detection, [50][51] and programmed control therapy. [47][48] In terms of multifunctionality, the UCNPs assembly not only preserve the original upconverting characteristics of UCNPs but also endowed with variable other functional properties with much improved. All these properties help to improve performance and overcome the limitations of UCNPs. The composition, morphology, and assembly manner of individual components can be tuned to obtain the desired properties and adjust them to the specific environment when needed. Combining UCNPs with other materials (quantum dots, [43] metals, [51] polymers, [52][53] DNA, [26,42,54] etc.) minimizes the challenges connected to the UCNPs implementation allowing the resulting materials to exhibit multifunctionalities. These approaches made the composites containing UCNPs very promising for a variety of applications.Recently, a variety of UCNPs assembly synthesis methods was developed, which involve interface, [55][56][57] microemulsion, [52,[58][59] and polymer/DNA [26,46,60] meditated method. Meanwhile, it is not hard for us to observe the appearance of UCNPs assembly in some new applied fields such as DNA detection, [50][51] chemo-photodynamic therapy, [53,60] and programmable therapeutics. [45,[47][48] A grasp of the achievements on the UCNPs assembilies reported over the last years would assist scientists to fully utilize the UCNPs based nanoplatforms for various applications. Thus, Section 2 of this review describes UCNPs properties, and Sections 3 is dedicated to UCNPsIn the past few decades, significant progress of the conventional upconversion nanoparticles (UCNPs) based nanoplatform has been achieved in many fields, and with the development of nanoscience and nanotechnology, more and more complex situations need a UCNPs based nanoplatform having multifunctions for specific multimodal or multiplexed applications. Through self-assembly, different UCN...

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Oxygen activation on Ba-containing perovskite materials

Cited by 50 publications

References 81 publications

Structure Modification, Evolution, and Compositional Changes of Highly Conductive La:BaSnO3 Thin Films Annealed in Vacuum and Air Atmosphere

Structure Modification, Evolution, and Compositional Changes of Highly Conductive La:BaSnO3 Thin Films Annealed in Vacuum and Air Atmosphere

Studies on the Structure and Optical Properties of BaSrMgWO<sub>6</sub> Thin Films Deposited by A Spin Coating Method

Self‐Assembly of Upconversion Nanoparticles Based Materials and Their Emerging Applications

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