Hydrogen-induced degradation in CaCu3Ti4O12 ceramics

Chen, Wan Ping; Wang, Xiang; Guo, Ming; You, Wen Chao; Zhao, Xing; Chan, Helen Lai Wah

doi:10.1016/j.jallcom.2005.12.013

Cited by 8 publications

(2 citation statements)

References 11 publications

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“…To explain these observations, at least qualitatively, one needs to consider the different bases in the dielectric behaviours of the two ceramics. Clearly, the very high dielectric constant observed in CCTO ceramics is attributable to highly resistive grain boundaries [18,30]. Interestingly, the CCTO-16-Ar ceramic, which has been subjected to longer sintering (16 h), also possessed one order of magnitude higher dielectric constant, possibly due to higher concentration of the acceptor state (oxygen vacancies) available in the grain boundaries of the ceramic [31].…”

Section: Resultsmentioning

confidence: 99%

Giant dielectric behaviour of CaCu₃Ti₄O₁₂subjected to post-sintering annealing and uniaxial stress

Thongbai

Masingboon

Maensiri

et al. 2007

J. Phys.: Condens. Matter

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This paper reports the influences of the post-sintering annealing in argon and uniaxial compressive pre-stress on the giant dielectric properties of the CaCu3Ti4O12 ceramics sintered at 1100 °C in air for 6 and 16 h. The CaCu3Ti4O12 ceramic sintered at 1100 °C for 6 h exhibited high ε′ of ∼1 × 104 whereas the CaCu3Ti4O12 ceramic sintered at 1100 °C for 16 h possessed one order of magnitude higher dielectric constant (ε′∼2 × 104). The dielectric behaviour of both samples exhibits Debye-like relaxation, and can be explained based on a Maxwell–Wagner model. Post-sintering annealing in argon for 5 h leads to a significant increase in ε′ for CaCu3Ti4O12 ceramic sintered at 1100 °C for 16 h but a slight decrease in ε′ for the CaCu3Ti4O12 ceramic sintered at 1100 °C for 6 h. The ε′ of the 16 h sintered CaCu3Ti4O12 ceramic after annealing in argon increases with increasing temperatures, and exhibits a peak at about 150 °C, which is closely related to the oxygen vacancies. The dielectric behaviour of this argon-annealed sample follows the UDR law. The dielectric properties of the argon-annealed samples change significantly with the applied compressive stress (the absolute change can reach 25% at a maximum stress of 130 MPa). However, the changes in dielectric properties with the stress in the samples subjected to different sintering times follow opposing trends. The mechanisms responsible for this difference are discussed.

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Section: Resultsmentioning

confidence: 99%

Giant dielectric behaviour of CaCu₃Ti₄O₁₂subjected to post-sintering annealing and uniaxial stress

Thongbai

Masingboon

Maensiri

et al. 2007

J. Phys.: Condens. Matter

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“…These oxide materials include ZnO [1][2][3], TiO 2 [4], Al 2 O 3 [5], Nb 2 O 5 [6] and other simple oxides as well as complex oxides such as ferrites [7,8], ferroelectrics [9][10][11][12], and proton conductors [13] and so on. These oxide materials are largely used or have promising applications in many industrial sectors.…”

Section: Introductionmentioning

confidence: 99%

Stability of YAlO3 in hydrogen at high temperature

et al. 2011

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Hydrogen-induced modifications of oxide materials have started to trigger much interest in the field of hydrogen-related oxide materials. From both scientific and technological viewpoints, the sciences of hydrogen-induced modifications of hydrogen-related oxide materials need to be studied more extensively and intensively. Al 2 O 3 and Y 2 O 3 have been applied in many areas, e.g. thermal barrier coatings, tritium permeation barriers and refractory materials and so on. However, these structural materials are sometimes used in harsh reducing environments, which proposes strict requirements in the mechanical and electrical properties of the materials. However, the performance of YAlO 3 in reducing atmospheres, i.e. the complex oxide of Y 2 O 3 and Al 2 O 3 , has hardly been studied. Therefore, the stability of YAlO 3 single crystals in hydrogen at high temperature was investigated in the present study. The results show that with increasing hydrogen treatment time, the hardness and electrical resistivity of YAlO 3 decrease. The mechanism for hydrogen-induced modifications of the electrical properties and hardness of YAlO 3 single crystals were analyzed through comparisons of X-ray diffraction patterns and infrared absorption spectra.

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Great diversity in stability of perovskite-type oxides studied by electrochemical hydrogen charging

Pei

Chen

2011

Wuhan Univ. J. Nat. Sci.

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Single crystals of 0.91Pb(Zn 1/3 Nb 2/3 )O 3 -0.09PbTiO 3 , SrTiO 3 and BaTiO 3 , and ceramic pellets of CaCu 3 Ti 4 O 12 and BiFeO 3 have been studied and compared through electrochemical hydrogen charging, in which the oxides were coated with silver electrodes to electrolyze water as the cathode. Great diversity has been observed in the stability of the oxides: 0.91Pb(Zn 1/3 Nb 2/3 )O 3 -0.09PbTiO 3 was quickly decomposed; hydrogen could enter the lattice of the other four oxides, but their properties were influenced at extremely different speeds. Such a great diversity in stability against hydrogen among perovskite-type oxides highlights the importance of reliability study over functional oxides materials.

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Hydrogen-induced degradation in CaCu3Ti4O12 ceramics

Cited by 8 publications

References 11 publications

Giant dielectric behaviour of CaCu₃Ti₄O₁₂subjected to post-sintering annealing and uniaxial stress

Giant dielectric behaviour of CaCu₃Ti₄O₁₂subjected to post-sintering annealing and uniaxial stress

Stability of YAlO3 in hydrogen at high temperature

Great diversity in stability of perovskite-type oxides studied by electrochemical hydrogen charging

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Hydrogen-induced degradation in CaCu3Ti4O12 ceramics

Cited by 8 publications

References 11 publications

Giant dielectric behaviour of CaCu3Ti4O12subjected to post-sintering annealing and uniaxial stress

Giant dielectric behaviour of CaCu3Ti4O12subjected to post-sintering annealing and uniaxial stress

Stability of YAlO3 in hydrogen at high temperature

Great diversity in stability of perovskite-type oxides studied by electrochemical hydrogen charging

Contact Info

Product

Resources

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Giant dielectric behaviour of CaCu₃Ti₄O₁₂subjected to post-sintering annealing and uniaxial stress

Giant dielectric behaviour of CaCu₃Ti₄O₁₂subjected to post-sintering annealing and uniaxial stress