Phase stability and properties of Bi6Te2O13+δ (δ = 0 or 2)

Ferreira, K.D.; Gasparotto, Gisane; Maia, Lauro J. Q.; Reis, S. P.; Araújo, E. B.; Carvalho, J. F.

doi:10.1016/j.physb.2020.412780

Cited by 6 publications

(11 citation statements)

References 14 publications

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“…The first of them, at 870°C, is related to an endothermic transition concomitant to a mass loss of 1.5%. This peak corresponds to process of the orthorhombic to cubic phase transition of Bi6Te2O15 [12] as can be observed in the in inset box in figure 3(a), which is the phase mostly present in the mixture, as shown in the diffractogram of figure 1. The second peak with onset at 907°C corresponds to the melting point.…”

Section: A Bi6te2-xtixo13mentioning

confidence: 63%

“…The Bi6Te2-xRxO13 (R = Ti, Si and Ce) compositions were synthesized using two temperatures (750°C and 870°C) and a rapid (quenching) or controlled (2°C/min) cooling rate was applied. The temperature of 870°C was chosen because is between cubic/orthorhombic phase transition temperature (856°C) and melting point (930°C) [12].…”

Section: A Solid-state Reaction Synthesismentioning

confidence: 99%

“…The Bi2O3:TeO2 binary system presents many phases reported in the literature, although that for most of them there are no sufficient physical and chemical characterization. In particular, for the 3Bi2O3:2TeO2 composition there are two reported phases, the Bi6Te2O15 orthorhombic one, stable at room temperature, and the high temperature cubic phase Bi6Te2O13 [6,11,12]. This cubic-orthorhombic phase transition is accompanied by the oxidation of Te 4+ ions to Te 6+ ions, assimilating oxygen [11][12].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, for the 3Bi2O3:2TeO2 composition there are two reported phases, the Bi6Te2O15 orthorhombic one, stable at room temperature, and the high temperature cubic phase Bi6Te2O13 [6,11,12]. This cubic-orthorhombic phase transition is accompanied by the oxidation of Te 4+ ions to Te 6+ ions, assimilating oxygen [11][12]. Ferreira et al reports that the cubic phase can be kept at temperatures up to approximately 500°C during long time in a metastable condition due to the imposition of kinetic mechanisms [12].…”

Section: Introductionmentioning

confidence: 99%

“…This cubic-orthorhombic phase transition is accompanied by the oxidation of Te 4+ ions to Te 6+ ions, assimilating oxygen [11][12]. Ferreira et al reports that the cubic phase can be kept at temperatures up to approximately 500°C during long time in a metastable condition due to the imposition of kinetic mechanisms [12]. Knowing that the Bi2O3-based cubic structure materials are oxygen ion conductors and they can be applied in the solid oxide fuel cells, bring an important challenge related to obtaining the stable cubic phase at room temperature.…”

Section: Introductionmentioning

confidence: 99%

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Bi6Te2-xRxO13 (R=Ti, Si, Ce) Systems: A Investigation for Fuel Cell Applications

Ferreira¹,

Gasparatto²,

Viajante³

et al. 2024

RE&PQJ

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In recent years, the increase of economic and environmental problems related to energy generation has increased researches at renewable energy sources. Among others, the fuel cells excel as promising alternative technology of electricity generation and materials science is an ally in the search for better and more efficient materials for this application. In particular, solid-state ionic conductors represent functional materials with promising advantages for fuel cells, as is the case of Bi2O3-based oxygen ion conductors, however, they need to have its cubic phase stabilized at room temperature. This paper presents a study of the Bi6Te2-xRxO13 (R = Ti, Si and Ce) systems for such an application. Solid state reaction was used to materials synthesis. The 3Bi2O3:2TeO2 system present two phases, an orthorhombic one (Bi6Te2O15) stable at room temperature and another high temperature cubic (Bi6Te2O13). Experiments of substitution of Te ions by Ti, Si and Ce ions using the Bi6Te2- xRxO13 matrix were done intending to stabilize the cubic phase at room temperature and the results are presented as well as discussed here

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Section: A Bi6te2-xtixo13mentioning

confidence: 63%

Section: A Solid-state Reaction Synthesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Bi6Te2-xRxO13 (R=Ti, Si, Ce) Systems: A Investigation for Fuel Cell Applications

Ferreira¹,

Gasparatto²,

Viajante³

et al. 2024

RE&PQJ

Self Cite

View full text Add to dashboard Cite

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A facile one-step microwave-assisted synthesis of bismuth oxytelluride nanosheets for optoelectronic and dielectric application: An experimental & computational approach

Kumar,

Senapati,

Pradhan

et al. 2023

Journal of Alloys and Compounds

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Superior Performance of 2D Layered Bimetallic Bismuth and Copper Oxytellurides for Supercapacitor Applications

Kumar,

Nechikott,

Nayak

et al. 2024

ACS Appl. Energy Mater.

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Widespread applications of 2D metal oxychalcogenide materials in the fields of semiconductors, thermoelectrics, and optoelectronics have raised the interest of the research community to explore more about these materials. The addition of metals and the preparation of different combinations of composite materials can effectively raise their utility. Here, the synthesis of bismuth (Bi)-and copper (Cu)-based layered oxytelluride materials is performed using the "microwave method" at a fixed power of 540 W and an irradiation time of 20 min. Good crystalline phases of the synthesized materials are obtained from the crystallographic studies, which agree well with the reported studies done previously. Morphological studies show the appearance of nanosheet-like structures in different synthesized samples. The Raman spectra of the samples demonstrate several vibrational modes. Chemical analysis confirms the valence states of the individual elements. The synthesized bismuth oxytelluride (BOT), copper oxytelluride (COT), and bismuth copper oxytelluride (BCOT) samples are investigated for supercapacitor applications. The electrochemical capacitive performance of BOT, COT, and BCOT is studied in the potential range of 0−0.6 V in an aqueous 2 M KOH electrolyte. While BOT and COT exhibit only 95 F g −1 (57 C g −1 ) and 158 F g −1 (94.8 C g −1 ), respectively, BCOT can provide a higher specific capacitance of 323 F g −1 (193.8 C g −1 ) at a specific current of 2 A g −1 , with excellent cycling stability of 90.5% after continuous 5000 cycles. Thus, this study emphasizes the better capacitive performance of bimetallic oxychalcogenides over monometallic oxychalcogenides.

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Phase stability and properties of Bi6Te2O13+δ (δ = 0 or 2)

Cited by 6 publications

References 14 publications

Bi6Te2-xRxO13 (R=Ti, Si, Ce) Systems: A Investigation for Fuel Cell Applications

Bi6Te2-xRxO13 (R=Ti, Si, Ce) Systems: A Investigation for Fuel Cell Applications

A facile one-step microwave-assisted synthesis of bismuth oxytelluride nanosheets for optoelectronic and dielectric application: An experimental & computational approach

Superior Performance of 2D Layered Bimetallic Bismuth and Copper Oxytellurides for Supercapacitor Applications

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