Influence of porosity on the electrical properties of La9.33(SiO4)6O2 oxyapatite

Panteix, Pierre Jean; Julien, Isabelle; Abelard, Peter; Bernache‐Assollant, Didier

doi:10.1016/j.ceramint.2007.05.004

Cited by 45 publications

(21 citation statements)

References 32 publications

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“…For instance, they require high sintering temperatures (around 1,600°C) to obtain fully dense ceramic materials, which are necessary to separate the gases of anode and cathode compartments. Furthermore, the ionic conductivity of silicates depends strongly on synthesis method, sintering temperature, microstructure and porosity of ceramic materials [16][17][18]. Despite the fact that several wet chemical methods have been used to prepare silicates with low particle size, most of them require sintering temperatures as high as 1,600°C to obtain the required densification [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Lanthanum Germanate‐Based Apatites as Electrolyte for SOFCs

Marrero-López¹,

Díaz-Carrasco²,

Peña-Martínez³

et al. 2011

Fuel Cells

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Germanate apatites with composition La10–xGe5.5Al0.5O26.75–3x/2 have been evaluated for the first time as possible electrolytes for solid oxide fuel cells (SOFCs). Different electrode materials have been considered in this study, i.e. manganite, ferrite, nickelates and cobaltite as cathode materials; and NiO–CGO composite and chromium–manganite as anodes. The chemical compatibility and electrochemical performance of these electrodes with La9.8Ge5.5Al0.5O26.45 have been studied by X‐ray powder diffraction (XRPD) and impedance spectroscopy. The XRPD analysis did not reveal appreciable bulk reactivity with the formation of reaction products between the germanate electrolyte and these electrodes up to 1,200 °C. However, a significant cation interdiffusion was observed by energy dispersive spectroscopy (EDS) at the electrode/electrolyte interface, which leads to a significant decrease of the performance of these electrodes.

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Section: Introductionmentioning

confidence: 99%

Lanthanum Germanate‐Based Apatites as Electrolyte for SOFCs

Marrero-López¹,

Díaz-Carrasco²,

Peña-Martínez³

et al. 2011

Fuel Cells

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“…Previous study has shown the activation energy (DE) dependence of the porosity for ionic conductivity ceramic material [24]. In the same way, the increase of the activation energies with the density is presented in Fig.…”

Section: Electrical Measurementmentioning

confidence: 72%

An efficient way to improve the electrical stability of Ni0.6Si0.2Al0.6Mn1.6O4 NTC thermistor

Yang

Zhang

et al. 2011

Ceramics International

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“…An activation energy around 0.51 eV was obtained which corresponds to significantly lower values for an apatite-type La 9.33 (SiO 4 ) 6 O 2 film than that of 0.9 eV obtained by Tao and Irvine [23] for sol-gel coatings or of 0.94 to 0.71 eV measured by Panteix et al [42] on bulk pellets. In a recent paper, Panteix et al [43] mentioned that theoretical activation energy of 0.65 eV should be obtained in the case of perfectly dense apatite-like lanthanum silicate pellets. The significantly lower value of 0.51 eV determined here should be the result of the absence of polluting phases in the apatite-type and of an excellent coating density.…”

Section: Resultsmentioning

confidence: 97%

La9.33Si6O26 electrolyte thin films for IT-SOFC application deposited by a HIPIMS/DC hybrid magnetron sputtering process

Briois

Böhlmark³

et al. 2008

Ionics

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Apatite-type La 9.33 Si 6 O 26 thin films were elaborated by co-sputtering of two metallic La and Si targets powered, respectively, by high power impulse magnetron sputtering and direct current sources, in pure Ar atmosphere, followed by a subsequent high temperature oxidation treatment in air. The structural and chemical features of these films have been assessed by X-ray diffraction and scanning electron microscopy (SEM). The film with near lanthanum silicate La/Si atomic ratio deposited on a porous Ni-YSZ cermet substrates was initially amorphous. After thermal oxidation at 1,173 K in air, the coating crystallised under the expected apatite structure. SEM observation revealed that both film compactness and thickness increased after thermal oxidation. The conductivity evolution with temperature of the pure apatite-like lanthanum silicate coatings, as measured by complex impedance spectroscopy, showed that the activation energy of is quite low compared to the literature data.

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Influence of porosity on the electrical properties of La9.33(SiO4)6O2 oxyapatite

Cited by 45 publications

References 32 publications

Lanthanum Germanate‐Based Apatites as Electrolyte for SOFCs

Lanthanum Germanate‐Based Apatites as Electrolyte for SOFCs

An efficient way to improve the electrical stability of Ni0.6Si0.2Al0.6Mn1.6O4 NTC thermistor

La9.33Si6O26 electrolyte thin films for IT-SOFC application deposited by a HIPIMS/DC hybrid magnetron sputtering process

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