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首页> 外文期刊>Physica, B. Condensed Matter >Relaxation of substitutive atoms in manganites La(2/3)A(1/3)MnO(3), with A = Ca, Sr and Ba
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Relaxation of substitutive atoms in manganites La(2/3)A(1/3)MnO(3), with A = Ca, Sr and Ba

机译:La(2/3)A(1/3)MnO(3)中取代原子的弛豫,其中A = Ca,Sr和Ba

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We have studied a it internal friction (IF) peak at 400K which appears when site A in manganite type ABO(3) is partially substituted by Ca, Sr and Ba atoms. In the case of total substitution in CaMnO3 the 400 K peak is absent. The appearance and the increase of this peak measured in La1-x,Ca,MnO3 manganites with x = 0, 0.1, 0.2 and 0.33, reported in Salva et al. Physica B 384 (2006) 62], was associated to a Zener relaxation of the cations occupying equivalent crystallographic sites. In La2/3Sr1/3MnO3 and La2/3Ba1/3MnO3 Compounds, the 400K peak is also observed [S.S. Seiro, A.A. Ghilarducci, H.R. Salva, M. Vasquez Mansilla. M. Saint-Paul, P. Lejay, P. Monceau, J. Magn. Magn. Mater. 226-230 (2001) 988; H.R. Salva, P. Monceau, A. Ghilarducci, S. Seiro, M. Saint Paul, P. Lejay. Physica B 320 (2002) 97] [2,3], with activation enthalpies between 4 and 6eV. We analyse both the increase of IF maxima and relaxation strength with the increase of the substitutional atom size (1.26, 1.39 and 1.56 angstrom for Ca, Sr and Ba atoms, respectively); and with the increase of the Goldschmidt tolerance factor. This behaviour is comprehensible because the intensity of the Zener relaxation depends on the distortions introduced by pairs of substitutional atoms. (c) 2007 Elsevier B.V. All rights reserved.
机译:我们研究了在400K处的it内摩擦(IF)峰,该峰在ABO(3)型锰矿中的位点A被Ca,Sr和Ba原子部分取代时出现。在CaMnO3中完全取代的情况下,不存在400 K峰。 Salva等人报道了在La1-x,Ca,MnO3锰矿中测得的该峰的出现和增加,其中x = 0、0.1、0.2和0.33。 Physica B 384(2006)62]与占据等效晶体学位点的阳离子的齐纳弛豫有关。在La2 / 3Sr1 / 3MnO3和La2 / 3Ba1 / 3MnO3化合物中,也观察到400K峰[S.S. A.A. Seiro Ghilarducci,HR Salv,M。Vasquez Mansilla。 M. Saint-Paul,P。Lejay,P。Monceau,J。Magn。真是的母校226-230(2001)988; H.R. Salva,P.Monceau,A.Ghilarducci,S.Seiro,M.Saint Paul,P.Lejay。 Physica B 320(2002)97] [2,3],活化焓在4和6eV之间。我们分析了随着离子原子尺寸的增加(Ca,Sr和Ba原子分别为1.26、1.39和1.56埃),IF最大值和弛豫强度的增加;并且随着Goldschmidt容差因子的增加。这种行为是可以理解的,因为齐纳弛豫的强度取决于成对的取代原子所引起的畸变。 (c)2007 Elsevier B.V.保留所有权利。

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