Structural Study and Conductivity of BaZr0.90Ga0.10O2.95

Ahmed, Istaq; Ahlberg, Elisabet; Eriksson, Sten; Knee, Christopher S.; Karlsson, Maths; Matic, Aleksandar; Börjesson, Lars

doi:10.1002/9780470291337.ch11

Cited by 3 publications

(4 citation statements)

References 31 publications

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“…Because the conductivity experiment was performed in an inert, dry, atmosphere unlike the TGA, further proton uptake from the atmosphere was strictly limited. Analogous behavior has been reported previously for many systems 26,27,36,40,41 …”

Section: Discussionsupporting

confidence: 88%

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Crystal Structure and Proton Conductivity of BaZr_0.9Sc_0.1O_3−δ

Ahmed

Karlsson

Eriksson

et al. 2008

Journal of the American Ceramic Society

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Solid‐state sintering has been used to prepare the perovskite BaZr0.9Sc0.1O3−δ. Analysis of X‐ray powder diffraction data shows that an increase of the unit cell parameter, a, was observed after deuteration. Rietveld analysis of room‐temperature neutron powder diffraction data confirmed cubic symmetry (space group Pm‐3m). Dynamic thermogravimetric analysis indicates that the hydration process occurs below 335°C and approximately 58% of the theoretical number of protonic defects can be filled. The presence of protons/deutrons is seen from the strong O–H/O–D stretch band in the infrared spectrum of the hydrated/deuterated samples. The proton conductivity of a prehydrated sample was investigated under dry and wet Ar atmospheres.

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Section: Discussionsupporting

confidence: 88%

“…Analogous behavior has been reported previously for many systems. 26,27,36,40,41 The conductivity (Fig. 8) of the same sample under wet Ar shows a significantly higher value compared with the heating cycle under dry Ar, especially in the temperature range 3001-7001C.…”

Section: Discussionmentioning

confidence: 91%

Crystal Structure and Proton Conductivity of BaZr_0.9Sc_0.1O_3−δ

Ahmed

Karlsson

Eriksson

et al. 2008

Journal of the American Ceramic Society

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“…Three studies have attempted to use Ga as a dopant. [26][27][28] Omata et al reported that second phases were identified in the sample of X GaO1.5 = 0.025 after sintering at 1550°C. 26 Ahmed et al reported that the sample of X GaO1.5 = 0.050 after sintering at 1500°C was single phase.…”

Section: Solubility Of Magnesium Into the B-site Of Barium Zirconate-mentioning

confidence: 99%

“…26 Ahmed et al reported that the sample of X GaO1.5 = 0.050 after sintering at 1500°C was single phase. 27 Iwahara et al reported that the sample of X GaO1.5 = 0.025 after sintering at temperatures from 1500 to 1650°C was single-phase. 28 In our experiment, at X GaO1.5 = 0.075, the small amount of second phase in Ga-doped barium zirconate was detected.…”

Section: Solubility Of Magnesium Into the B-site Of Barium Zirconate-mentioning

confidence: 99%

Dependence of Dopant Cations on Microstructure and Proton Conductivity of Barium Zirconate

Imashuku¹,

Uda²,

Nosé³

et al. 2009

J. Electrochem. Soc.

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The effects of various cations ( Mg2+ , In3+ , Yb3+ , Tm3+ , Er3+ , Ho3+ , Gd3+ , Nd3+ , La3+ , Bi3+ , and Ga3+ ) were examined as dopants into the B site of perovskite barium zirconate. The solubility of In, Yb, Tm, Er, and Ho, whose ionic radii are close to that of zirconium ion, into the B site is more than 0.075 (normalXMO1.5=0.075) at 1600°C . In contrast, when there is a large difference of ionic radii between trivalent cations ( Nd3+ , La3+ , Bi3+ , and Ga3+ ) and zirconium ion, the solubility of trivalent cations into barium zirconate is less than normalXMO1.5=0.075 . The microstructure of sintered pellets and their conductivity in wet atmosphere were investigated. We could divide dopants into two classes based on the extent of proton conductivity and microstructure: “Y-type” and “Sc-type” dopants. Yb, Ho, Er, and Tm belong to Y-type dopants, which have a microstructural mixture of coarse and fine grains and higher proton conductivity. In belongs to Sc-type dopants, which have well-grown grains and lower proton conductivity.

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