EPR study of Cu(II) dopant ions in single crystals of bis(l-asparaginato)Zn(II)

Santana, Ricardo Costa de; Santos, Midiana Gusmão dos; Cunha, R. O.; Ferreira, K.D.; Carvalho, J. F.; Calvo, Rafael

doi:10.1016/j.jpcs.2005.11.006

Cited by 8 publications

(1 citation statement)

References 15 publications

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“…A study of partial replacement of the Te ions in the Bi6Te2-xRxO13 (R = Ti, Si and Ce) composition was done in order to minimize or avoid the oxidation of Te 4+ to Te 6+ during the cubic/orthohrombic phase transition. The addition of intentional impurities in crystalline compounds is an important tool in the materials chemistry and the object of numerous studies [13][14][15][16][17][18][19][20][21][22][23][24], in particular, there was an investigation of the stabilization of this cubic phase (Bi6Te2O13) at room temperature by replacing Bi ions [24]. Here, Ti, Si and Ce ions have been chosen to replace Te ion site because all of these ions present the same oxidation state (IV) and ionic radius close.…”

Section: Introductionmentioning

confidence: 99%

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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