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Title: Microstructure evolution and magnetoresistance of the A-site ordered Ba-doped manganites

Abstract

The microstructure, crystal structure, and magnetotransport properties of microsized and nanosized Badoped manganites have been investigated. A 'two-step' reduction-reoxidation procedure has been used to obtain nanosized ceramic manganite Nd{sub 0.70}Ba{sub 0.30}MnO{sub 3} (II). The parent microsized manganite Nd{sub 0.70}Ba{sub 0.30}MnO{sub 3} (I) was prepared by usual ceramic technology in air. Then the sample was annealed in vacuum. The grain size of the reduced sample, determined by scanning electron microscopy, decreased from {approx}5 {mu}m down to {approx}100 nm. To obtain the oxygen stoichiometry nanosized sample, the Nd{sub 0.70}Ba{sub 0.30}MnO{sub 2.60} was again annealed in air. It is established that the (I) sample is a pseudocubic perovskite, whereas (II) is tetrahedral as a consequence of Nd{sup 3+} and Ba{sup 2+} ions as well as the ordering of oxygen vacancies. The (I) sample is a ferromagnet with T{sub C} {approx} 140 K. It has metal-insulator transition at T{sub MI} {approx} 135 K and a peak of magnetoresistance {approx}50% in a field of 9 kOe. For the (II) sample, the critical points of phase transitions move to higher temperatures, T{sub C} {approx} 320 K and T{sub MI} {approx} 310 K. The magnetoresistance of the (II) sample at room temperature (T {approx} 293 K) ismore » about 7% in a field of 9 kOe. The magnetotransport properties are interpreted in the framework of the nanosized effect.« less

Authors:
; ; ; ; ;  [1];  [2]
  1. National Academy of Sciences of Belarus, Joint Institute of Solids and Semiconductor Physics (Belarus)
  2. Polish Academy of Sciences, Institute of Physics (Poland)
Publication Date:
OSTI Identifier:
21088070
Resource Type:
Journal Article
Resource Relation:
Journal Name: Semiconductors; Journal Volume: 41; Journal Issue: 5; Other Information: DOI: 10.1134/S1063782607050041; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANNEALING; BARIUM COMPOUNDS; BARIUM IONS; CERAMICS; DOPED MATERIALS; GRAIN SIZE; MAGNETORESISTANCE; MANGANESE COMPOUNDS; NANOSTRUCTURES; NEODYMIUM COMPOUNDS; NEODYMIUM IONS; OXIDES; PEROVSKITE; PHASE TRANSFORMATIONS; SCANNING ELECTRON MICROSCOPY; TEMPERATURE RANGE 0065-0273 K; TEMPERATURE RANGE 0273-0400 K; VACANCIES

Citation Formats

Trukhanov, S. V., E-mail: truhanov@ifttp.bas-net.by, Lobanovski, L. S., Bushinsky, M. V., Khomchenko, V. A., Fedotova, V. V., Troyanchuk, I. O., and Szymczak, H.. Microstructure evolution and magnetoresistance of the A-site ordered Ba-doped manganites. United States: N. p., 2007. Web. doi:10.1134/S1063782607050041.
Trukhanov, S. V., E-mail: truhanov@ifttp.bas-net.by, Lobanovski, L. S., Bushinsky, M. V., Khomchenko, V. A., Fedotova, V. V., Troyanchuk, I. O., & Szymczak, H.. Microstructure evolution and magnetoresistance of the A-site ordered Ba-doped manganites. United States. doi:10.1134/S1063782607050041.
Trukhanov, S. V., E-mail: truhanov@ifttp.bas-net.by, Lobanovski, L. S., Bushinsky, M. V., Khomchenko, V. A., Fedotova, V. V., Troyanchuk, I. O., and Szymczak, H.. Tue . "Microstructure evolution and magnetoresistance of the A-site ordered Ba-doped manganites". United States. doi:10.1134/S1063782607050041.
@article{osti_21088070,
title = {Microstructure evolution and magnetoresistance of the A-site ordered Ba-doped manganites},
author = {Trukhanov, S. V., E-mail: truhanov@ifttp.bas-net.by and Lobanovski, L. S. and Bushinsky, M. V. and Khomchenko, V. A. and Fedotova, V. V. and Troyanchuk, I. O. and Szymczak, H.},
abstractNote = {The microstructure, crystal structure, and magnetotransport properties of microsized and nanosized Badoped manganites have been investigated. A 'two-step' reduction-reoxidation procedure has been used to obtain nanosized ceramic manganite Nd{sub 0.70}Ba{sub 0.30}MnO{sub 3} (II). The parent microsized manganite Nd{sub 0.70}Ba{sub 0.30}MnO{sub 3} (I) was prepared by usual ceramic technology in air. Then the sample was annealed in vacuum. The grain size of the reduced sample, determined by scanning electron microscopy, decreased from {approx}5 {mu}m down to {approx}100 nm. To obtain the oxygen stoichiometry nanosized sample, the Nd{sub 0.70}Ba{sub 0.30}MnO{sub 2.60} was again annealed in air. It is established that the (I) sample is a pseudocubic perovskite, whereas (II) is tetrahedral as a consequence of Nd{sup 3+} and Ba{sup 2+} ions as well as the ordering of oxygen vacancies. The (I) sample is a ferromagnet with T{sub C} {approx} 140 K. It has metal-insulator transition at T{sub MI} {approx} 135 K and a peak of magnetoresistance {approx}50% in a field of 9 kOe. For the (II) sample, the critical points of phase transitions move to higher temperatures, T{sub C} {approx} 320 K and T{sub MI} {approx} 310 K. The magnetoresistance of the (II) sample at room temperature (T {approx} 293 K) is about 7% in a field of 9 kOe. The magnetotransport properties are interpreted in the framework of the nanosized effect.},
doi = {10.1134/S1063782607050041},
journal = {Semiconductors},
number = 5,
volume = 41,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}