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; M. K. Lee; S. Y. Sun

doi:10.1134/S1063783407030092

Effect of alkali-earth ions on the local structure of LaAlO ₃-La_0.67 A _0.33MnO₃ (A = Ca, Sr, Ba) diluted solid solutions: ²⁷Al NMR studies

E. V. Charnaya, Cheng Tien, N. V. Chejina, M. K. Lee, S. Y. Sun

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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-yLa_0.67 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 language	English
Pages (from-to)	449-453
Number of pages	5
Journal	Physics of the Solid State
Volume	49
Issue number	3
DOIs	https://doi.org/10.1134/S1063783407030092
Publication status	Published - 2007 Mar

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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@article{cb7c0c2e91274f1088881213e74b75d7,

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.",

author = "Charnaya, {E. V.} and Cheng Tien and Chejina, {N. V.} and Lee, {M. K.} and Sun, {S. Y.}",

note = "Funding Information: ACKNOWLEDGMENTS This work was supported by the National Science Council of Taiwan, grant 93-2811-M-006-021.",

year = "2007",

month = mar,

doi = "10.1134/S1063783407030092",

language = "English",

volume = "49",

pages = "449--453",

journal = "Physics of the Solid State",

issn = "1063-7834",

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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, M. K.

AU - Sun, S. Y.

N1 - Funding Information: ACKNOWLEDGMENTS This work was supported by the National Science Council of Taiwan, grant 93-2811-M-006-021.

PY - 2007/3

Y1 - 2007/3

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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Effect of alkali-earth ions on the local structure of LaAlO ₃-La_0.67 A _0.33MnO₃ (A = Ca, Sr, Ba) diluted solid solutions: ²⁷Al NMR studies

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