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

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)449-453
頁數5
期刊Physics of the Solid State
49
發行號3
DOIs
出版狀態Published - 2007 三月

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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