ChemInform Abstract: Synthesis of Orthorhombic Phase Pr₁(Ba_0.55Pr_0.45)₂ (Cu_0.95⁵⁷Fe_0.05)₃O_z and a Moessbauer Study of the Local Oxygen Environment of Probe Iron Atoms.

Abstract

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A comparative Mössbauer study of the Nd1+xBa2 x(Cu0.9757Fe0.03)3Ozsolid solution: the role of low-temperature treatment

“…The hyperfine parameters of the D1, D3 and D4 components correlate well with a number of reference data grouped in several areas in figure 3 [7][8][9]. This grouping seems to be helpful for the spectral component identification in our experiments since the areas are separate and are predetermined by the 57 Fe coordination and the type of copper position occupied by 57 Fe in the structure.…”

“…XRD did not show foreign magnetic phases in the samples. However, a magnetic structure is observed for quenched (as-prepared) Nd123:Fe samples as in our previous works [7,8]. It indicates that iron atoms interact with paramagnetic copper in Cu(2)O 2 planes antiferromagnetically ordered below T N ∼ 450 K if Nd123 is in its oxygen-poor tetragonal modification [1].…”

“…The actual temperature was screened by the Scientific Instruments Inc. (series 5500) controller. 57 Fe Mössbauer spectra were measured at the room temperature on an electrodynamic spectrometer with a constant acceleration [7][8][9]. The radiation source was 57 Co(Rh).…”

Dynamics of cation ordering in an intentionally prepared low-Tcpseudocubic NdBa2Cu3O6.9phase

“…The anomalous peak effect phenomenon generally associated with outstanding magnetic and electric properties of NdBa 2 Cu 3 O 7 [1] is known to be the result of flux pinning on nanoscale compositional fluctuations formed in a supersaturated solid solution due to its subsolidus decomposition [2][3][4][5][6]. This is the most remarkable, but not the only, example among the other still puzzling consequences of collective cation and oxygen disorder influencing structural characteristics [7][8][9][10][11][12][13][14][15][16][17][18][19][20], superconductivity [1,3,6,10,11,[20][21][22][23][24], thermal stability [2, 5, 11-13, 25, 26], oxygen exchange features [14,19,22,23,26] and transformation dynamics [6,10,14,15,[21][22][23] of NdBCO HTSCs.…”