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|Title:||How different is mechanical activation from thermal activation? A case study with PZN and PZN-based relaxors|
|Authors:||Wang, J. |
|Citation:||Wang, J., Xue, J., Wan, D. (2000-01-01). How different is mechanical activation from thermal activation? A case study with PZN and PZN-based relaxors. Solid State Ionics 127 (1-2) : 169-175. ScholarBank@NUS Repository. https://doi.org/10.1016/S0167-2738(99)00275-1|
|Abstract:||Using Pb(Zn1/3Nb2/3)O3 (PZN) and PZN-based relaxor ferroelectrics, we demonstrate that the solid state reactions triggered by mechanical activation of mixed oxides can proceed via a completely different route from that in the conventional solid state reactions, where the process is controlled by one or more interfacial reactions and diffusions. Nanocrystallites of perovskite Pb(Zn1/3Nb2/3)O3 are formed in a highly activated state of mixed oxides where a degree of amorphization has taken place, followed by a steady growth with increasing degree of mechanical activation. The absence of transitional pyrochlores, such as the Pb3Nb4O13-type phases which have always been observed in the conventional solid state reactions, and the considerably low local temperature at the collision points suggest that the perovskite phase occurs via a process involving nucleation and subsequent diffusionless growth.|
|Source Title:||Solid State Ionics|
|Appears in Collections:||Staff Publications|
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