Surface segregation and charge state of La₀.₇Sr₀.₃MnO₃

Nuclear magnetic resonance and secondary ion mass-spectroscopy have been used to study the surface charge and surface chemical compositions of La₀.₇Sr₀.₃MnO₃ nanoparticles of 12 and 50-100 nm size. It is found that the surface of particles is characterized by an increased content of Sr and Mn ions t...

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Datum:2006
Hauptverfasser: Danilenko, I.A., Konstantinova, T.E., Shatalova, G.E., Krivoruchko, V.N., Doroshev, V.D., Stupak, V.A., Volkova, G.K.
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Sprache:English
Veröffentlicht: НТК «Інститут монокристалів» НАН України 2006
Schriftenreihe:Functional Materials
Online Zugang:http://dspace.nbuv.gov.ua/handle/123456789/144371
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Zitieren:Surface segregation and charge state of La₀.₇Sr₀.₃MnO₃ / I.A. Danilenko, T.E. Konstantinova, G.E. Shatalova, V.N. Krivoruchko, V.D. Doroshev, V.A. Stupak, G.K. Volkova // Functional Materials. — 2006. — Т. 13, № 2. — С. 9. — Бібліогр.: 288-292 назв. — англ.

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spelling irk-123456789-1443712018-12-21T01:23:14Z Surface segregation and charge state of La₀.₇Sr₀.₃MnO₃ Danilenko, I.A. Konstantinova, T.E. Shatalova, G.E. Krivoruchko, V.N. Doroshev, V.D. Stupak, V.A. Volkova, G.K. Nuclear magnetic resonance and secondary ion mass-spectroscopy have been used to study the surface charge and surface chemical compositions of La₀.₇Sr₀.₃MnO₃ nanoparticles of 12 and 50-100 nm size. It is found that the surface of particles is characterized by an increased content of Sr and Mn ions than the bulk, while the difference depends on particle size. The surface segregation process is considered to be a possible mechanism for cation rearrangement. Thus, the observed magnetically dead layer on a particle surface may be formed due to increase in the Sr and Mn ions concentrations up to values corresponding to an antiferromagnetic state. Методами ядерного магнитного резонанса и вторичной ионной масс-спектроскопии проведены исследования зарядового состояния и химического состава поверхности наночастиц La₀.₇Sr₀.₃MnO₃ с размерами 12 и 50-100 нм. Обнаружено, что для поверхности частиц характерно повышенное содержание ионов Sr и Mn по сравнению с объемом, причем это различие зависит от размера частиц. В качестве возможного механизма перераспределения катионов рассматривается процесс поверхностной сегрегации. Таким образом, наблюдаемый немагнитный слой па поверхности частиц может быть сформирован в результате увеличения концентрации ионов Sr и Mn в поверхностном слое до величин, соответствующих антиферромагнитному состоянию. Методами ядерного магнітного резонансу і вторинної іонної мас-спектроскопії проведено дослідження зарядового етапу та хімічного складу поверхні наночастинок La₀.₇Sr₀.₃MnO₃ з розмірами 12 і 50-100 нм. Виявлено, що для поверхні частинок характерний підвищений склад іонів Sr і Mn, а їхня концентрація залежить від розміру частинок. Як можливий механізм перерозподілу катіонів розглядається процес поверхневої сегрегації. Таким чином, немагнітний шар, що спостерігається на поверхні частинок, може бути сформований в результаті збільшення концентрації іонів Sr і Mn у поверхневому шарі до величин, що відповідають антиферомагнітному етапу. 2006 Article Surface segregation and charge state of La₀.₇Sr₀.₃MnO₃ / I.A. Danilenko, T.E. Konstantinova, G.E. Shatalova, V.N. Krivoruchko, V.D. Doroshev, V.A. Stupak, G.K. Volkova // Functional Materials. — 2006. — Т. 13, № 2. — С. 9. — Бібліогр.: 288-292 назв. — англ. 1027-5495 http://dspace.nbuv.gov.ua/handle/123456789/144371 en Functional Materials НТК «Інститут монокристалів» НАН України
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
language English
description Nuclear magnetic resonance and secondary ion mass-spectroscopy have been used to study the surface charge and surface chemical compositions of La₀.₇Sr₀.₃MnO₃ nanoparticles of 12 and 50-100 nm size. It is found that the surface of particles is characterized by an increased content of Sr and Mn ions than the bulk, while the difference depends on particle size. The surface segregation process is considered to be a possible mechanism for cation rearrangement. Thus, the observed magnetically dead layer on a particle surface may be formed due to increase in the Sr and Mn ions concentrations up to values corresponding to an antiferromagnetic state.
format Article
author Danilenko, I.A.
Konstantinova, T.E.
Shatalova, G.E.
Krivoruchko, V.N.
Doroshev, V.D.
Stupak, V.A.
Volkova, G.K.
spellingShingle Danilenko, I.A.
Konstantinova, T.E.
Shatalova, G.E.
Krivoruchko, V.N.
Doroshev, V.D.
Stupak, V.A.
Volkova, G.K.
Surface segregation and charge state of La₀.₇Sr₀.₃MnO₃
Functional Materials
author_facet Danilenko, I.A.
Konstantinova, T.E.
Shatalova, G.E.
Krivoruchko, V.N.
Doroshev, V.D.
Stupak, V.A.
Volkova, G.K.
author_sort Danilenko, I.A.
title Surface segregation and charge state of La₀.₇Sr₀.₃MnO₃
title_short Surface segregation and charge state of La₀.₇Sr₀.₃MnO₃
title_full Surface segregation and charge state of La₀.₇Sr₀.₃MnO₃
title_fullStr Surface segregation and charge state of La₀.₇Sr₀.₃MnO₃
title_full_unstemmed Surface segregation and charge state of La₀.₇Sr₀.₃MnO₃
title_sort surface segregation and charge state of la₀.₇sr₀.₃mno₃
publisher НТК «Інститут монокристалів» НАН України
publishDate 2006
url http://dspace.nbuv.gov.ua/handle/123456789/144371
citation_txt Surface segregation and charge state of La₀.₇Sr₀.₃MnO₃ / I.A. Danilenko, T.E. Konstantinova, G.E. Shatalova, V.N. Krivoruchko, V.D. Doroshev, V.A. Stupak, G.K. Volkova // Functional Materials. — 2006. — Т. 13, № 2. — С. 9. — Бібліогр.: 288-292 назв. — англ.
series Functional Materials
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first_indexed 2025-07-10T19:16:26Z
last_indexed 2025-07-10T19:16:26Z
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