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000049227 084__ $$2WoS$$aElectrochemistry
000049227 084__ $$2WoS$$aEnergy & Fuels
000049227 1001_ $$0P:(DE-Juel1)VDB58234$$aShiratori, Yu.$$b0$$uFZJ
000049227 245__ $$aInfluence of impurities on the conductivity of composites in the system (3YSZ)1-x-(MgO)x
000049227 260__ $$aNew York, NY [u.a.]$$bElsevier$$c2005
000049227 300__ $$a32 - 42
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000049227 520__ $$a(3YSZ)(1-x)-(MgO)(x) form composites above x = 0.15, which consist of stabilized-zirconia and magnesia. Electrical conductivities of the two-phase composites were measured by the four-probe DC technique. Negative influences of impurities such as SiO2 on the conductivity are discussed with the aid of microstructural investigations using SEM and TEM. In the investigated composites, the impurities do not directly affect the electrical conduction as current blockers at grain boundaries as usually observed in pure YSZ electrolytes. Microstructural investigation using HRTEM revealed that grain boundaries of the stabilized zirconia are very clean because the silicon and aluminum oxide impurities react with MgO to form discrete Mg2SiO4 and MgAl2O4 grains in the electrolytes, respectively. A theoretical approach taking into consideration continuous volumes of existing phases reveals that the conductivity of the two-phase composites depends on the phase continuity. The reduction of the continuity of the zirconia phase is the main reason for the decrease of conductivity in the present system. (c) 2005 Elsevier B.V. All rights reserved.
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000049227 65320 $$2Author$$asolid oxide fuel cell
000049227 65320 $$2Author$$asolid electrolytes
000049227 65320 $$2Author$$atwo-phase composite
000049227 65320 $$2Author$$aelectrical conductivity
000049227 7001_ $$0P:(DE-Juel1)129667$$aTietz, F.$$b1$$uFZJ
000049227 7001_ $$0P:(DE-Juel1)VDB85249$$aPenkalla, H.-J.$$b2$$uFZJ
000049227 7001_ $$0P:(DE-Juel1)VDB11177$$aHe, J. Q.$$b3$$uFZJ
000049227 7001_ $$0P:(DE-Juel1)VDB58237$$aShiratori, Yo.$$b4$$uFZJ
000049227 7001_ $$0P:(DE-Juel1)129666$$aStöver, D.$$b5$$uFZJ
000049227 773__ $$0PERI:(DE-600)1491915-1$$a10.1016/j.jpowsour.2005.01.036$$gVol. 148, p. 32 - 42$$p32 - 42$$q148<32 - 42$$tJournal of power sources$$v148$$x0378-7753$$y2005
000049227 8567_ $$uhttp://dx.doi.org/10.1016/j.jpowsour.2005.01.036
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