Mössbauer Spectroscopy of Pressure-Induced Phase Transformation from Maghemite to Hematite

2003 ◽  
Vol 72 (10) ◽  
pp. 2640-2645 ◽  
Author(s):  
Takateru Kawakami ◽  
Saburo Nasu ◽  
Toshio Tsutsui ◽  
Tetsuya Sasaki ◽  
Takahiro Yamada ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Mössbauer Spectroscopy ◽  
Mossbauer Spectroscopy ◽  
Mößbauer Spectroscopy

Premartensitic phase transformation in a TiNiFe shape memory alloy studied by Mössbauer spectroscopy

1991 ◽  
Vol 66 (1-4) ◽  
pp. 345-349 ◽  
Author(s):  
M. Jiménez ◽  
S. Aburto ◽  
S. Gómez ◽  
V. Marquina ◽  
M. L. Marquina ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Mössbauer Spectroscopy ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Mossbauer Spectroscopy ◽  
Mößbauer Spectroscopy

scholarly journals High-Temperature Superconductors and Related Compounds Studied by Mössbauer Spectroscopy

1993 ◽  
Vol 15 (3-4) ◽  
pp. 211-224 ◽  
Author(s):  
E. Kuzmann ◽  
Z. Homonnay ◽  
S. Nagy ◽  
M. Gál ◽  
A. Vértes
Keyword(s):  
Phase Transformation ◽  
Mössbauer Spectroscopy ◽  
High Temperature ◽  
Low Temperature ◽  
Mossbauer Spectroscopy ◽  
High Temperature Superconductors ◽  
Temperature Phase ◽  
Mößbauer Spectroscopy ◽  
Related Compounds ◽  
Low Temperature Phase

57Fe,119Sn, and151Eu Mössbauer spectroscopy was used to study the chemical structure, phonon mode changes, and low-temperature phase transformation around the Tcas well as suppression of superconductivity in high-temperature superconductors and related compounds. Anomalous temperature-dependent changes in the total57Fe spectral area fraction and in the Mössbauer line shift were simultaneously found around the Tcin a EuBa2(Cu0.9957Fe0.01)3O7-dsuperconductor. These anomalous changes were attributed to phonon softening and low-temperature phase transformation occurring around the superconducting transition. Significant differences were observed between the57Fe Mössbauer spectra of superconducting EuBa2(Cu0.9957Fe0.01)3O7-dand the isostructural non-superconducting PrBa2(Cu0.9957Fe0.01)3O7-d. The differences were interpreted in connection with the suppression of superconductivity (by hole filling or hybridization of Pr, Cu and O states) in the Pr-containing compound. The unusually high isomer shift value observed in the Pr-containing material can give evidence for the charge transfer mechanism between the Cu(1) chains and the Cu(2) planes and for its role in the suppression of superconductivity.

Amorphous to Crystalline Phase Transformation in Metglas® Studied by Mössbauer Spectroscopy

1997 ◽  
Vol 481 ◽  
Author(s):  
V. Marquina ◽  
R. Gómez ◽  
S. Aburto ◽  
M. Jiménez ◽  
R. Ridaura ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Differential Scanning Calorimetry ◽  
Phase Transformation ◽  
Mössbauer Spectroscopy ◽  
Curie Temperature ◽  
Mossbauer Spectroscopy ◽  
Scanning Calorimetry ◽  
Mößbauer Spectroscopy ◽  
The Magnetic Field

ABSTRACTWe present differential scanning calorimetry (DSC) and in situ Mössbauer spectroscopy results for Metglas ribbons, to which different heat treatments were made. The Curie temperature of the amorphous phase is determined and the evolution of the magnetic field of this phase is studied as a function of temperature.

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