Proton conductivity and low temperature structure of In-doped BaZrO3

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

doi:10.1016/j.ssi.2006.05.030

Cited by 64 publications

(57 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1 for clarification) and is not a result of a lowering of symmetry after deuteration, unlike the findings for Sr 3 Ca 1.18 Nb 1.82 O 8.73−y [27]. We have previously observed similar results from X-ray powder diffraction analysis of an x = 0.375 In 3+ doped sample [25]. This sample was annealed at 250 • C for 198 h under a flow of oxygen saturated with water at 22 • C and the formation of two phases was attributed to the existence of non-equilibrium conditions for the given experimental parameters.…”

Section: Methodssupporting

confidence: 73%

“…Shi et al [22] have also recently reported theoretical findings on the effect of A-cation substitution on the proton position and proton conductivity of In substituted AZrO 3 (A = Ca, Sr, Ba) perovskites. Attracted by the apparent simplicity of the cubic symmetry of BaZr 0.5 In 0.5 O 3−y [23][24][25], and the ability of the phase to absorb significant levels of protons, [21] we have collected high-resolution neutron powder diffraction (NPD) data at low temperature on a deuterated sample with the aim of locating the D positions. A deuterated sample was used to avoid the large incoherent cross section of protons to neutrons.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Location of deuteron sites in the proton conducting perovskite BaZr0.50In0.50O3−y

Ahmed

Knee

Karlsson

et al. 2008

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Section: Methodssupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Location of deuteron sites in the proton conducting perovskite BaZr0.50In0.50O3−y

Ahmed

Knee

Karlsson

et al. 2008

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…The inability of complex impedance technique to access grain response in this type of ceramics was discussed widely in literature [24][25][26]. They claimed that grain semicircle could not be measured at temperatures above 300°C.…”

Section: Electrical Conductivitymentioning

confidence: 99%

Preparation and characterization of Yb-doped Ba(Ce,Zr)O3 nanopowders with high sinterability

Osman

Talib

Hamid

2010

Ionics

View full text Add to dashboard Cite

The Ba(Ce 0.8 Zr 0.2 ) 0.95 Yb 0.05 O 2.975 ceramics electrolyte was prepared via a Pechini method using metal nitrate salts as starting materials. An optimum annealing temperature of 1,400°C was needed to obtain a pure perovskite-like phase with orthorhombic structure. Particle size distribution showed a bimodal distribution that corresponds to the loose powders and agglomerates size. Scanning electron micrograph revealed that the loose powders were in the nanosize range (70-200 nm). These ultrafine loose powders enhanced the densification of a pellet with relative density ∼95% obtained at 1,400°C. The sample formed clear and compact grains with submicron sizes. Impedance results showed that the impedance semicircle of the grain was observed only at T≤250°C. The introduction of 20 mol% Zr improved the chemical stability of BaCe 0.95 Yb 0.05 O 2.975 sample in atmosphere containing carbon dioxide at 600°C. The sample also exhibited high proton conductivity in wet hydrogen.

show abstract

“…The sequencing of B-site cations in microwave dielectric materials is an important factor that affects the structures and dielectric properties of complex perovskite microwave dielectric ceramics [6][7][8][9][10]; thus, substitution at the B-site can modulate the structures and properties of ceramics [11][12][13][14][15][16]. BMT exhibits a hexagonal (P3m1) [17] structure, while BaZrO 3 presents a cubic (Pm3m) [18] structure. The average ionic radius of Mg 1/3 Ta 2/3 in the B-site is 0.667 Å , whereas Zr 4?…”

Section: Introductionmentioning

confidence: 99%

Far infrared reflection study on structure–property relationship of Ba[Mg(1−x)/3ZrxTa2(1−x)/3]O3 ceramics

Liang

Shi

Liu

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

/3 Zr x Ta 2(1-x)/3 ]O 3 (BMZT, x = 0, 0.1, 0.2, 0.3) solid solution ceramics were synthesized at 1520°C for 3 h through the conventional solid-state reaction method. The ceramics were characterized by X-ray diffraction and Far-infrared spectroscopy (FIR) to evaluate the correlations among crystal structures, dielectric properties, and phonon modes. Results show that the FIR active modes near 290 and 415 cm -1 disappeared with increasing Zr 4? concentration, the frequencies of the modes near 230 and 540 cm -1 shifted toward high frequency and their intensities decreased, whereas the frequencies of the modes near 450 cm -1 reached a maximum value at x = 0.1. The crystal structures transformed from hexagonal to pseudo-cubic, and eventually to cubic structure, with increasing Zr 4? concentration. Correlations were established between crystal structures and dielectric properties with vibration modes as a media. The ceramics presented the best dielectric properties when x = 0.2 with a pseudo-cubic structure.

show abstract

Proton conductivity and low temperature structure of In-doped BaZrO3

Cited by 64 publications

References 16 publications

Location of deuteron sites in the proton conducting perovskite BaZr0.50In0.50O3−y

Location of deuteron sites in the proton conducting perovskite BaZr0.50In0.50O3−y

Preparation and characterization of Yb-doped Ba(Ce,Zr)O3 nanopowders with high sinterability

Far infrared reflection study on structure–property relationship of Ba[Mg(1−x)/3ZrxTa2(1−x)/3]O3 ceramics

Contact Info

Product

Resources

About