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Title: Structural Features of PLZT Films

Abstract

Lead zirconate titanate (PZT) films doped with lanthanum, Pb({sub 1–х)}La{sub х}(Zr{sub 0.48}Ti{sub 0.52}) (х = 0, 0.02, 0.05, 0.08, or 0.01), have been investigated by electron microscopy and X-ray diffraction. Films were formed on Si–SiO{sub 2}–TiO{sub 2}–Pt substrates by chemical vapor deposition from a solution and annealed at temperatures T = 650 and 750°C. The main structural features of the films, differing them from undoped PZT films fabricated by the same method, have been established. It is found that doping with lanthanum delays the pyrochlore–perovskite transformation in the film bulk, i.e., in the regions distant from the film–substrate interface. The fraction of metastable pyrochlore phase increases with an increase in the La molar content in the films. The main reason for the delay is the deficit of lead in the intergranular perovskite space, especially in the upper part of the film. Annealing at T = 750°C reduces the content of pyrochlore phase but does not completely remove it, which was never observed for undoped PZT films. Doping with lanthanum leads to a change in the lattice period c and a tetragonal distortion of the perovskite lattice (c/a ratio). Hence, the [100] texture of the films obtained, in contrast to themore » typical [111] texture of PZT films, is due to the increase in the lattice mismatch between the film and platinum layer when lead atoms are replaced with lanthanum. Lattice distortions of “transrotational” character, whose value exceeds 160 deg/μm, are found to arise in growing crystals.« less

Authors:
;  [1];  [2]; ;  [3];  [4]; ;  [5]
  1. Russian Academy of Sciences, Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” (Russian Federation)
  2. AO Transneft’ Neftyanye Nasosy (Russian Federation)
  3. Ural Federal University (Russian Federation)
  4. OOO Bruker (Russian Federation)
  5. Moscow Technological University (MIREA) (Russian Federation)
Publication Date:
OSTI Identifier:
22758212
Resource Type:
Journal Article
Journal Name:
Crystallography Reports
Additional Journal Information:
Journal Volume: 63; Journal Issue: 4; Other Information: Copyright (c) 2018 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7745
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; ANNEALING; CHEMICAL VAPOR DEPOSITION; CRYSTAL DEFECTS; DOPED MATERIALS; ELECTRON MICROSCOPY; FILMS; LANTHANUM; LAYERS; LEAD; PEROVSKITE; PLATINUM; PLZT; PYROCHLORE; PZT; SILICA; SILICON OXIDES; SUBSTRATES; TEXTURE; TITANIUM OXIDES; X-RAY DIFFRACTION

Citation Formats

Zhigalina, O. M., E-mail: zhigal@crys.ras.ru, Khmelenin, D. N., Valieva, Yu. A., Kolosov, V. Yu., Bokuniaeva, A. O., Kuznetsov, G. B., Vorotilov, K. A., and Sigov, A. S. Structural Features of PLZT Films. United States: N. p., 2018. Web. doi:10.1134/S1063774518040314.
Zhigalina, O. M., E-mail: zhigal@crys.ras.ru, Khmelenin, D. N., Valieva, Yu. A., Kolosov, V. Yu., Bokuniaeva, A. O., Kuznetsov, G. B., Vorotilov, K. A., & Sigov, A. S. Structural Features of PLZT Films. United States. doi:10.1134/S1063774518040314.
Zhigalina, O. M., E-mail: zhigal@crys.ras.ru, Khmelenin, D. N., Valieva, Yu. A., Kolosov, V. Yu., Bokuniaeva, A. O., Kuznetsov, G. B., Vorotilov, K. A., and Sigov, A. S. Sun . "Structural Features of PLZT Films". United States. doi:10.1134/S1063774518040314.
@article{osti_22758212,
title = {Structural Features of PLZT Films},
author = {Zhigalina, O. M., E-mail: zhigal@crys.ras.ru and Khmelenin, D. N. and Valieva, Yu. A. and Kolosov, V. Yu. and Bokuniaeva, A. O. and Kuznetsov, G. B. and Vorotilov, K. A. and Sigov, A. S.},
abstractNote = {Lead zirconate titanate (PZT) films doped with lanthanum, Pb({sub 1–х)}La{sub х}(Zr{sub 0.48}Ti{sub 0.52}) (х = 0, 0.02, 0.05, 0.08, or 0.01), have been investigated by electron microscopy and X-ray diffraction. Films were formed on Si–SiO{sub 2}–TiO{sub 2}–Pt substrates by chemical vapor deposition from a solution and annealed at temperatures T = 650 and 750°C. The main structural features of the films, differing them from undoped PZT films fabricated by the same method, have been established. It is found that doping with lanthanum delays the pyrochlore–perovskite transformation in the film bulk, i.e., in the regions distant from the film–substrate interface. The fraction of metastable pyrochlore phase increases with an increase in the La molar content in the films. The main reason for the delay is the deficit of lead in the intergranular perovskite space, especially in the upper part of the film. Annealing at T = 750°C reduces the content of pyrochlore phase but does not completely remove it, which was never observed for undoped PZT films. Doping with lanthanum leads to a change in the lattice period c and a tetragonal distortion of the perovskite lattice (c/a ratio). Hence, the [100] texture of the films obtained, in contrast to the typical [111] texture of PZT films, is due to the increase in the lattice mismatch between the film and platinum layer when lead atoms are replaced with lanthanum. Lattice distortions of “transrotational” character, whose value exceeds 160 deg/μm, are found to arise in growing crystals.},
doi = {10.1134/S1063774518040314},
journal = {Crystallography Reports},
issn = {1063-7745},
number = 4,
volume = 63,
place = {United States},
year = {2018},
month = {7}
}