Effect of alkali-earth ions on the local structure of LaAlO 3-La0.67 A 0.33MnO3 (A = Ca, Sr, Ba) diluted solid solutions: 27Al NMR studies

E. V. Charnaya, Cheng Tien, N. V. Chejina, Min-Kai Lee, S. Y. Sun

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

27Al magic angle spinning (MAS) nuclear magnetic resonance (NMR) was studied for diluted alkali earth metal-doped lanthanum manganite solid solutions in the lanthanum aluminate (1 - y)LaAlO3-yLa0.67 A 0.33MnO3 (A = Ca, Sr, Ba) with y =0, 2, 3, and 5 mol %. The spectra depended on the dopant species and showed higher substitutional ordering for the Ba-containing mixed crystals. Magnetically shifted lines were observed in all solid solutions and were attributed to Al in the octahedral oxygen environment near manganese trivalent ions. Nonlinear dependences of their intensity were referred to the manganese-rich cluster formation. An additional MAS NMR line corresponding to aluminum at sites different from the octahedral site in pure LaAlO3 was observed only in solutions doped with Ba. 3Q MAS NMR revealed that the broadening of this line is governed mainly by quadrupole coupling and made it possible to calculate the isotropic chemical shift.

Original languageEnglish
Pages (from-to)449-453
Number of pages5
JournalPhysics of the Solid State
Volume49
Issue number3
DOIs
Publication statusPublished - 2007 Mar 1

Fingerprint

Magic angle spinning
Alkalies
metal spinning
Lanthanum
Solid solutions
alkalies
solid solutions
Earth (planet)
Nuclear magnetic resonance
Ions
Manganese
lanthanum
nuclear magnetic resonance
trivalent ions
manganese ions
ions
Chemical shift
mixed crystals
Aluminum
resonance lines

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Effect of alkali-earth ions on the local structure of LaAlO 3-La0.67 A 0.33MnO3 (A = Ca, Sr, Ba) diluted solid solutions: 27Al NMR studies",
abstract = "27Al magic angle spinning (MAS) nuclear magnetic resonance (NMR) was studied for diluted alkali earth metal-doped lanthanum manganite solid solutions in the lanthanum aluminate (1 - y)LaAlO3-yLa0.67 A 0.33MnO3 (A = Ca, Sr, Ba) with y =0, 2, 3, and 5 mol {\%}. The spectra depended on the dopant species and showed higher substitutional ordering for the Ba-containing mixed crystals. Magnetically shifted lines were observed in all solid solutions and were attributed to Al in the octahedral oxygen environment near manganese trivalent ions. Nonlinear dependences of their intensity were referred to the manganese-rich cluster formation. An additional MAS NMR line corresponding to aluminum at sites different from the octahedral site in pure LaAlO3 was observed only in solutions doped with Ba. 3Q MAS NMR revealed that the broadening of this line is governed mainly by quadrupole coupling and made it possible to calculate the isotropic chemical shift.",
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Effect of alkali-earth ions on the local structure of LaAlO 3-La0.67 A 0.33MnO3 (A = Ca, Sr, Ba) diluted solid solutions : 27Al NMR studies. / Charnaya, E. V.; Tien, Cheng; Chejina, N. V.; Lee, Min-Kai; Sun, S. Y.

In: Physics of the Solid State, Vol. 49, No. 3, 01.03.2007, p. 449-453.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of alkali-earth ions on the local structure of LaAlO 3-La0.67 A 0.33MnO3 (A = Ca, Sr, Ba) diluted solid solutions

T2 - 27Al NMR studies

AU - Charnaya, E. V.

AU - Tien, Cheng

AU - Chejina, N. V.

AU - Lee, Min-Kai

AU - Sun, S. Y.

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N2 - 27Al magic angle spinning (MAS) nuclear magnetic resonance (NMR) was studied for diluted alkali earth metal-doped lanthanum manganite solid solutions in the lanthanum aluminate (1 - y)LaAlO3-yLa0.67 A 0.33MnO3 (A = Ca, Sr, Ba) with y =0, 2, 3, and 5 mol %. The spectra depended on the dopant species and showed higher substitutional ordering for the Ba-containing mixed crystals. Magnetically shifted lines were observed in all solid solutions and were attributed to Al in the octahedral oxygen environment near manganese trivalent ions. Nonlinear dependences of their intensity were referred to the manganese-rich cluster formation. An additional MAS NMR line corresponding to aluminum at sites different from the octahedral site in pure LaAlO3 was observed only in solutions doped with Ba. 3Q MAS NMR revealed that the broadening of this line is governed mainly by quadrupole coupling and made it possible to calculate the isotropic chemical shift.

AB - 27Al magic angle spinning (MAS) nuclear magnetic resonance (NMR) was studied for diluted alkali earth metal-doped lanthanum manganite solid solutions in the lanthanum aluminate (1 - y)LaAlO3-yLa0.67 A 0.33MnO3 (A = Ca, Sr, Ba) with y =0, 2, 3, and 5 mol %. The spectra depended on the dopant species and showed higher substitutional ordering for the Ba-containing mixed crystals. Magnetically shifted lines were observed in all solid solutions and were attributed to Al in the octahedral oxygen environment near manganese trivalent ions. Nonlinear dependences of their intensity were referred to the manganese-rich cluster formation. An additional MAS NMR line corresponding to aluminum at sites different from the octahedral site in pure LaAlO3 was observed only in solutions doped with Ba. 3Q MAS NMR revealed that the broadening of this line is governed mainly by quadrupole coupling and made it possible to calculate the isotropic chemical shift.

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