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首页> 外文会议>Electric field assisted sintering and related phenomena far from equilibrium >Growth Behavior of Faceted Na_(1/2)Bi_(1/2)TiO_3-BaTiO_3 Grains in Single and Two-step Sintering in Support for the Microstructural Evolution Principle
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Growth Behavior of Faceted Na_(1/2)Bi_(1/2)TiO_3-BaTiO_3 Grains in Single and Two-step Sintering in Support for the Microstructural Evolution Principle

机译：支持微结构演化原理的单步和两步烧结中刻面Na_（1/2）Bi_（1/2）TiO_3-BaTiO_3晶粒的生长行为

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摘要

We investigated the grain growth behavior in 89Na_(1/2)Bi_(1/2)TiO_3-11BaTiO_3 (mol %, NBT-11BT) at 1100 and 1200 ℃, and also under two-step sintering at 1200 (first) and 1100 ℃ (second). When the powder compacts were sintered at 1100 and 1200 ℃, the initial growth behavior was quite normal; however, the subsequent growth behavior was distinctively abnormal and moderately abnormal, respectively. This difference in growth behavior is attributed to a change in the critical driving force for appreciable migration of the boundary with temperature and can be explained by the coupling effect of the maximum driving force for the growth of the largest grain and the critical driving force for appreciable migration of the grain boundary, viz. the principle of microstructural evolution. In contrast, two-step sintered samples exhibited stagnant grain growth behavior at the second sintering step up to 10 h at 1100 ℃ after appreciable initial growth of grains during the first sintering step at 1200 ℃. Measurement of the grain size distribution after the first sintering step at 1200 ℃ indicated that the maximum driving force for the growth of the largest grain was reduced to a lower value than that in the sample conventionally sintered at 1100 ℃ without the first sintering step. This suggests that the beneficial effect of two-step sintering for suppressing grain growth is due to the reduction of the maximum driving force after the first sintering step compared with the maximum driving force in the conventionally sintered sample with the same average grain size. The experimental results confirm the general applicability of the recently deduced principle of microstructural evolution.
机译：我们研究了在1100和1200℃以及在1200（第一）和1100的两步烧结条件下，在89Na_（1/2）Bi_（1/2）TiO_3-11BaTiO_3（mol％，NBT-11BT）中的晶粒生长行为℃（秒）。当粉末压块在1100和1200℃烧结时，初始生长行为是正常的。然而，随后的生长行为分别是明显异常和中度异常。生长行为的这种差异归因于临界驱动力随温度明显迁移的变化，并且可以通过最大晶粒生长的最大驱动力与明显的临界驱动力的耦合效应来解释。晶界的迁移，即。微结构演化原理。相比之下，两步烧结的样品在1200℃的第一烧结步骤中出现了明显的初始晶粒生长之后，在1100℃的长达10 h的第二烧结步骤中表现出了停滞的晶粒生长行为。在1200℃进行第一烧结步骤后的粒度分布测量表明，与未进行第一烧结步骤的常规在1100℃烧结的样品相比，最大晶粒生长的最大驱动力降低到更低的值。这表明两步烧结抑制晶粒生长的有益效果是由于与具有相同平均粒度的常规烧结样品相比，第一烧结步骤之后最大驱动力的减小。实验结果证实了最近推导的微结构演化原理的普遍适用性。

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