Metastable adaptive orthorhombic martensite in zirconia nanoparticles
Metastable adaptive orthorhombic martensite in zirconia nanoparticles
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DOI：
10.1107/s1600576714003331
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发表时间：
2014-04
影响因子：
6.1
通讯作者：
Shaocun Liu;Wentao Hu;Yang Zhang;J. Xiang;F. Wen;Bo Xu;Julong He;D. Yu;Yongjun Tian;Zhongyuan Liu
中科院分区：
文献类型：
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作者：
Shaocun Liu;Wentao Hu;Yang Zhang;J. Xiang;F. Wen;Bo Xu;Julong He;D. Yu;Yongjun Tian;Zhongyuan Liu
本文报道了大气条件下Pbca空间群中分离的正交(o) ZrO2纳米粒子（NPs）的观测结果。这些NPs由0个由内部半相干边界分隔的畴组成。它们被鉴定为由层状孪晶四方NPs转变而来。孪晶界的约束作用阻碍了马氏体向单斜(m)相的直接转变，而有利于向o相的转变。内部边界被认为是由层状孪晶边界演变而来的，在大气条件下对o型结构的稳定起着重要作用。观察到的o型组织应该是由t相转变而来的自适应马氏体，不同于一般认为的o相是中间阶段。在t-to-o变换中，确定了新的（011）o||(100)t和[100]o||[001]t的晶格对应关系。提出一种可能的转换路径为t（空间群P42/nmc）到0 （Pbcm或Pbc21，命名为oA）到0 (Pbca，命名为oB)，并确定LC关系为（100）t||(100)oA||(011)oB和[001]t||[010]oA||[100]oB。
Reported here are observations of isolated orthorhombic (o) ZrO2 nanoparticles (NPs) in the Pbca space group under atmospheric conditions. These NPs are composed of o domains separated by internal semi-coherent boundaries. They are identified to transform from lamellar-twinned tetragonal (t) NPs. The constraining effect of the twin boundaries impedes a direct martensitic transformation to the monoclinic (m) phase but favours a transformation to the o phase. The internal boundaries are considered to evolve from the lamellar-twinning boundaries, playing an important role in the stabilization of the o structure under atmospheric conditions. The observed o structure should be an adaptive martensite transformed from the t phase, different from the general consideration of the o phase as an intermediate stage. A new lattice correspondence (LC) relationship of (011)o||(100)t and [100]o||[001]t is determined for the t-to-o transformation. A possible transformation path is proposed to be t (space group P42/nmc) to o (Pbcm or Pbc21, named oA) to o (Pbca, named oB), and the LC relationship is identified to be (100)t||(100)oA||(011)oB and [001]t||[010]oA||[100]oB.