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MSE_442_Lecture_23_Nov 18 2013

E per unit area of the boundary is na is dicult to

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Unformatted text preview: rate- controlling ion, trends in the mobility values are clear. §༊  First, the measured mobiliGes of the oxides are well below the calculated intrinsic values. §༊  Second, dense samples containing dopants or second- phase precipitates have low mobiliGes, while the mobiliGes for porous samples are much lower than those for the dense samples. §༊  Third, when liquid phases are present, the mobiliGes are higher than those for porous samples but oeen not much higher than for dense samples. q༇  Because of their influence on the boundary mobility, the use of fine second phase parGcles and, in parGcular, the use of dopants form two of the most effecGve approaches for 23 controlling grain size during solid- state sintering. Effect of Fine Second-Phase Particles q༇  L...
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