Properties of yttrium-doped barium zirconate ceramics synthesized by the oxidant-peroxo method

Gonçalves, Mayra D.; Muccillo, R.

doi:10.1016/j.ceramint.2013.06.086

Cited by 25 publications

(19 citation statements)

References 39 publications

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“…Besides, this method allows the formation of stoichiometric powders with reactive nanoparticles [33][34][35][36][37][38]. In the present work, experiments were carried out on the synthesis by the oxidant peroxide method of BaZr 0.9 Y 0.1 O 3 À δ following two approaches: i) under usual laboratory air and ii) under controlled nitrogen atmosphere inside a glove box.…”

Section: Introductionmentioning

confidence: 99%

Effect of synthesis atmosphere on the proton conductivity of Y-doped barium zirconate solid electrolytes

Gonçalves

Maram

Navrotsky

et al. 2016

Ceramics International

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a b s t r a c tYttrium-doped barium zirconate ceramic powders were synthesized by the oxidant peroxide method in air and under controlled atmosphere of nitrogen inside a glove box. The powders were characterized by thermogravimetry, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. After uniaxial cold isostatic pressing, green pellets were sintered at 1600°C for 4 h. The electrical conductivity behavior was accessed by electrochemical impedance spectroscopy. The results show that specimens synthesized under controlled atmosphere achieved higher electrical conductivity, two orders of magnitude higher than specimens prepared in laboratory air. The enhancement in electrochemical properties and increase in sintering ability is attributed to the less carbonate contamination as a result lower grain boundary density in the samples prepared under controlled atmosphere.

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Section: Introductionmentioning

confidence: 99%

Effect of synthesis atmosphere on the proton conductivity of Y-doped barium zirconate solid electrolytes

Gonçalves

Maram

Navrotsky

et al. 2016

Ceramics International

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“…The problem of finding proper materials for electrochemical devices is well known. Materials exhibiting high conductivity are usually not very chemically stable, e.g., BaZrO 3 proton conductor (Gonçalves and Muccillo 2014). Thus finding new stable materials exhibiting high conductivity seems crucial, especially if the materials are ion conductors in the undoped state.…”

Section: Introductionmentioning

confidence: 99%

Enthalpies of formation of rare earth niobates, RE₃NbO₇

Mielewczyk‐Gryń

Navrotsky

2015

American Mineralogist

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High-temperature oxide melt solution calorimetry was used to investigate energetics of a series of rare earth niobates RE 3 NbO 7 . All of investigated compounds were found to be stable in enthalpy in respect to their oxides. The enthalpy of formation from oxides becomes more exothermic as the size of the RE cation increases, a trend seen previously in other RE compounds including pyrochlores, perovskites, and phosphates. For smaller RE cations the enthalpy of exchange of RE between niobates and titanates is close to zero, whereas larger RE are energetically favored in the titanate pyrochlores. Implications of the results from the geochemical and material engineering points of view are discussed.

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“…1,[15][16][17][18][19][20][21][22][23][24] Table 1 summarizes the lattice parameters of BZY10 prepared by different techniques. 1,[15][16][17][18][19][20][21][22][23][24] Table 1 summarizes the lattice parameters of BZY10 prepared by different techniques.…”

Section: Introductionmentioning

confidence: 99%

Chemical expansion in BaZr_0.9−xCe_xY_0.1O_3−δ(x= 0 and 0.2) upon hydration determined by high‐temperature X‐ray diffraction

et al. 2017

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Understanding the strain from chemical expansion of proton‐conducting ceramics is crucial to prevent their failure under operating conditions. BZY10 (BaZr0.9Y0.1O3−δ) and BZCY72 (BaZr0.7Ce0.2Y0.1O3−δ) were studied using high‐temperature X‐ray diffraction (HT‐XRD) in moist and dry reducing atmosphere in order to prevent the competition with the oxidation reaction. Both powder and dense specimens were investigated and similar lattice parameters were obtained, demonstrating that the data were recorded on samples that were in equilibrium with the surrounding environment. Two sets of experiments were performed. In the first one, the sample was hydrated in situ in the XRD chamber at high temperature and diffraction data were collected during cooling. For the second set, the samples were pre‐hydrated ex situ in an autoclave and the XRD patterns were recorded during heating under dry conditions. As expected, lattice parameters were larger for the hydrated samples, due to hydration chemical expansion. The chemical expansion was also found to be larger with the presence of Ce. Finally, larger concentrations of protonic defects were present in the lattice of the ex situ pre‐hydrated samples compared with the in situ hydrated samples.

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Properties of yttrium-doped barium zirconate ceramics synthesized by the oxidant-peroxo method

Cited by 25 publications

References 39 publications

Effect of synthesis atmosphere on the proton conductivity of Y-doped barium zirconate solid electrolytes

Effect of synthesis atmosphere on the proton conductivity of Y-doped barium zirconate solid electrolytes

Enthalpies of formation of rare earth niobates, RE₃NbO₇

Chemical expansion in BaZr_0.9−xCe_xY_0.1O_3−δ(x= 0 and 0.2) upon hydration determined by high‐temperature X‐ray diffraction

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Properties of yttrium-doped barium zirconate ceramics synthesized by the oxidant-peroxo method

Cited by 25 publications

References 39 publications

Effect of synthesis atmosphere on the proton conductivity of Y-doped barium zirconate solid electrolytes

Effect of synthesis atmosphere on the proton conductivity of Y-doped barium zirconate solid electrolytes

Enthalpies of formation of rare earth niobates, RE3NbO7

Chemical expansion in BaZr0.9−xCexY0.1O3−δ(x= 0 and 0.2) upon hydration determined by high‐temperature X‐ray diffraction

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Enthalpies of formation of rare earth niobates, RE₃NbO₇

Chemical expansion in BaZr_0.9−xCe_xY_0.1O_3−δ(x= 0 and 0.2) upon hydration determined by high‐temperature X‐ray diffraction