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High Resolution Imaging of Twin and Antiphase Domain Boundaries in Perovskite KNbO3 Thin Films.

Published online by Cambridge University Press:  21 February 2011

Shang H. Rou ,
Philip D. Hren ,
John J. Hren ,
Thomas M. Graettinger ,
Michael S. Ameen ,
Orlando H. Auciello  and
Angus I. Kingon
Shang H. Rou
Affiliation:
Department of Materials Science and Engineering, N. C.State University, Raleigh, NC.
Philip D. Hren
Affiliation:
Department of Materials Science and Engineering, N. C.State University, Raleigh, NC.
John J. Hren
Affiliation:
Department of Materials Science and Engineering, N. C.State University, Raleigh, NC.
Thomas M. Graettinger
Affiliation:
Department of Materials Science and Engineering, N. C.State University, Raleigh, NC.
Michael S. Ameen
Affiliation:
Department of Materials Science and Engineering, N. C.State University, Raleigh, NC.
Orlando H. Auciello
Affiliation:
Also, Microelectronics Center of N. C., Research Triangle Park, NC.
Angus I. Kingon
Affiliation:
Department of Materials Science and Engineering, N. C.State University, Raleigh, NC.
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Abstract

Perovskite KNbO 3 thin films were heteroepitaxially deposited onto (100) MgO substrates. Twin domains with tetrahedral shape were typically observed. These tetrahedrons were bounded by three {211} twin planes. High resolution transmission electron microscopy (HRTEM) was employed to examine these {211} twin boundaries. Surface steps of {110}<110> type generated by dislocation slip were present on the MgO substrate. The tetrahedral twin domains originate on surface steps, then grow with a stacking fault relationship to the matrix. The strain fields of dislocations near the stacking faults slightly rotate the tetrahedral twin nuclei. This small degree of misalignment between the matrix and the twin domain result in some of the twin boundaries having amorphous boundary regions rather than coherent interfaces.

Order-disorder antiphase domains (APD's) were directly imaged with HRTEM. Ultra small APD's ranging from 10 to 30 atomic spacings were observed. The origin of these APD's was either the surface steps of {100} <1 10> type on MgO substrates or the random nucleation of anions at either of two equivalent sites on the MgO substrate.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 183: Symposium E – High Resolution Electron Microscopy of Defects in Materials , 1990 , 285
Copyright
Copyright © Materials Research Society 1990

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References

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