Dual-phase composites

As seen from Table 10.1 impressive oxygen fluxes have been reported through 25 mol% yttria-stabilized bismuth oxide (BY25) [110] and 25 mol% erbia-stabilized bismuth oxide (BE25) [111,112], which oxide electrolytes were rendered electronically conductive by dispersion with silver metal. A prerequisite is that both constituent phases in the composite membranes do form a continuous path for both ionic and electronic conduction, having their concentrations above the critical (percolation threshold) volume fraction ])(,. The latter quantity determines the minimum volume fraction in which conduction is possible and is a function of, for example, the relative dimensions and shape of the particles of both constituent phases [113]. In actual composite materials, 

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C.S. Chen, Fine grained zirconia-metal dual phase composites, PhD Thesis, University... 

Zro.84Yo,i60i,92-Lao.gSro.2Cro.5Feo.503 5 dual-phase composite hollow fiber membrane targeting chemical reactor applications. Journal of Membrane Science, 389, 435—440. 

Li, Q.M., Zhu, X.F., and Yang, W.S. (2008) Single-step febrication of asymmetric dual-phase composite membranes for oxygen separation. J. Membr. Sci, 325, 11-15. 

Lao.8Sro.2Mn03-a dual-phase composite hollow fiber membrane for oxygen separation. Ind. Eng. Chem. Res., 48,... 

Single-step fabrication of asymmetric dual-phase composite membranes for oxygen separation. 

Chen, C.S., Kruidhof, H., Bouwmeester, H.J.M., Verweij, H., and Burggraaf, A.J., Oxygen permeation through oxygen ion oxide-noble metal dual phase composites. Solid State Ionics, 1996, 86-88, 569-572. 

Chen, C.S., Fine Grained Zirconia-Metal Dual Phase Composites, Ph.D. thesis. University of Twente, The Netherlands, 1994. 

A dual-phase composite consisting of percolating phases of an ionic conductor and an electronic conductor (dual-phase membrane). 

Chen, T, Zhao, H., Xu, N. et al. (2011) Synthesis and oxygen permeation properties of a Ce,j gSmo 2O2 j-LaBaC02Oj j dual-phase composite membrane. Journal of Membrane Science, 370, 158-165. 

Yang, C., Xu, Q., Liu, C., Liu, J., Chen, C. and Liu, W. (2011) Bi, jYj jSmj 20j-LaosSto 2MnOj dual-phase composite hollow fiber membrane for oxygen separation. Materials Letters, 65, 3365-3367. 

Figure I The schematic view of the model for the crack development mechanism in a dual-phase composite allowing for the initial damage level of its structure ...

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