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Metastable adaptive orthorhombic martensite in zirconia nanoparticles
Author(s) -
Liu Shaocun,
Hu Wentao,
Zhang Yang,
Xiang Jianyong,
Wen Fusheng,
Xu Bo,
He Julong,
Yu Dongli,
Tian Yongjun,
Liu Zhongyuan
Publication year - 2014
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576714003331
Subject(s) - crystal twinning , orthorhombic crystal system , monoclinic crystal system , crystallography , lamellar structure , tetragonal crystal system , materials science , crystal structure , phase (matter) , diffusionless transformation , metastability , lattice (music) , martensite , chemistry , physics , microstructure , organic chemistry , acoustics
Reported here are observations of isolated orthorhombic (o) ZrO 2 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 P 4 2 / nmc ) to o ( Pbcm or Pbc 2 1 , 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 .