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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 13 (1991), S. 1425-1428 
    ISSN: 0392-6737
    Keywords: Mössbauer effect ; other γ-ray spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Two double-layered perowskitic compounds have been investigated by XRD analysis and Mössbauer spectroscopy. The experimental data allow the conclusion that magnetization is almost parallel to the stacking planes of these layered structures.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 1663-1667 
    ISSN: 0392-6737
    Keywords: Mössbauer effect ; other γ-ray spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Quadrupole splittings of the Mössbauer spectrum of the La24Fe6Li22O56 compound are compared with structural data obtained by XRD single-crystal analysis. Agreement turns out to be rather good, in spite of the crude model utilized for evaluating the electric-field gradient on the resonant nucleus
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 1017-1020 
    ISSN: 0392-6737
    Keywords: Superconducting materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Pellets of sintered YBa2Cu3O7−δ with three different oxygen contents have been irradiated with fast neutron beams of energies 6.5, 3.3 and 4.4 MeV at fluences of 7.7·104, 1.3·105 and 1.4·109 n/cm2, respectively. The radiation damage has been investigated by comparing the critical temperature (T c mid ), the zero resistivity and the onset temperature before and after neutron irradiation. The critical current has been measured for a few samples in the same experimental conditions. In all transport measurements two different responses to the neutron radiation are observed and discussed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 8 (1986), S. 251-261 
    ISSN: 0392-6737
    Keywords: Mössbauer effect ; other γ-ray spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sono stati studiati mediante la spettroscopia Mössbauer ossidi perowskitici stratificati del tipo MeIILaFeO4. I dati sperimentali, che evidenziano un ordine antiferromagnetico, sono stati confrontati col modello del campo molecolare per mezzi anisotropi. Gli ioni FeIII risultano essere in uno stato di alto spin con magnetizzazione parallela agli strati perowskitici.
    Notes: Summary Layered perowskitic oxides of the general composition MeIILaFeO4 were investigated by means of Mössbauer spectroscopy. The experimental data, which evidentiate antiferromagnetic order, were compared with the molecular field model for anisotropic media. The FeIII ions are found to be in a high-spin state with magnetization parallel to the perowskitic layers.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 9 (1987), S. 1275-1283 
    ISSN: 0392-6737
    Keywords: Mössbauer effect ; other γ-ray spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Il composto NH4FeF4, caratterizzato da strati di ottaedri (FeF6)3− alternati con strati NH 4 + , è stato studiato con la spettroscopia Mössbauer. I dati sperimentali, che evidenziano un ordine antiferromagnetico, sono stati interpretati col modello del campo molecolare per mezzi anisotropi. Si è trovato che la magnetizzazione è ortogonale agli strati ottaedrici e che gli assi ottaedrici sono inclinati di 17° rispetto alla direzione di magnetizzazione.
    Abstract: Резюме С помощью мëссбауэровской спектроскопии исследуется соединение NH4FeF4, характеризующееся слоями (FeF6)3−, которые чередуются с NH 4 + слоями. Экспериментальные данные, которые подтверждают антиферромагнитную упоряденность, сравниваются с моделью молекулярного поля для анизотропной среды. Обнаружено, что намагниченность ортогональна октаэдрическим слоям, а октаэдрические оси наклонены под углом 17° к направлению намагниченности.
    Notes: Summary The compound NH4FeF4, characterized by layers of (FeF6)3− octahedra alternating with NH 4 + layers, has been investigated by means of Mössbauer spectroscopy. Experimental data, which evidentiate an antiferromagnetic order, are compared with the molecular-field model for anisotropic media. Magnetization is found orthogonal to the octahedra layers and the octahedra axes are found to be tilted by 17° with respect to the magnetization direction.
    Type of Medium: Electronic Resource
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