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  • 1
    Electronic Resource
    Electronic Resource
    New phases in the most basic zone of the system Ba−Cu−O (1988)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 611-614 
    Details
    ISSN: 0392-6737
    Keywords: Phase diagrams of nonmetallic materials ; Superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary In the most basic part of the binary system BaO−CuO two new compounds were identified corresponding to the Ba2CuO3 and Ba3CuO4 formulae. Another more oxidized phase of composition Ba2CuO3+δ was also obtained, which can exist in two crystalline modifications. For all these new substances the structural type and the lattice parameters are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453299
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  • 2
    Electronic Resource
    Electronic Resource
    Low-flux neutron irradiation of ceramic YBa2 Cu3O7−δ (1990)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 1017-1020 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF02453047
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  • 3
    Electronic Resource
    Electronic Resource
    Modulation of HTSC characteristics induced by proton irradiation (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1933-1939 
    Details
    ISSN: 0392-6737
    Keywords: Flux pinning, flux creep, and flux-line lattice dynamics ; Critical currents ; Material effects onT c, κ, critical currents (including impurities, ion implantation, etc.) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Bulk slabs of sintered YBCO were irradiated with monoenergetic protons at different energies (3.5 and 6.5 MeV) and different fluences, ranging from 1.8·1016 to 8.6·1016 p/cm2. The effects on intergrain critical currents of protons crossing the sample and the effects of protons implanting in the specimen, has been studied by means of a.c. susceptibility characterizations. D.c. hysteresis cycles were measured in low fields in order to investigate the modifications in the intergrain critical current density due to proton implantation. The main result is the evidence that the intergrainJ c response to the applied field can be modulated by means of the proton irradiation. Resistive measurements were also performed in order to investigate the complex transport phenomena in polycrystalline materials. Irradiation-induced effects on both superconducting- and normal-state resistivity are studied. The addition of extrinsic defects can lead to enhanced transport properties, emerging especially when a magnetic field is applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462196
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  • 4
    Electronic Resource
    Electronic Resource
    Bidimensional antiferromagnetism in layered NH4FeF4 (1987)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 9 (1987), S. 1275-1283 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF02454728
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  • 5
    Electronic Resource
    Electronic Resource
    Investigation of the La24Fe6Li22O56 compound by Mössbauer spectroscopy (1989)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 1663-1667 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF02451020
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  • 6
    Electronic Resource
    Electronic Resource
    Investigation of superconductivity in the Y−Ba−Cu−O system (1988)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 875-879 
    Details
    ISSN: 0392-6737
    Keywords: General properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Experiments are performed to determine the effect of polyphasicity on YBa2Cu3O7−x critical temperature. Results are obtained which show thatT c fluctuations up to 2 K exist, depending on phase mixing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450147
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  • 7
    Electronic Resource
    Electronic Resource
    Advances in melt-processed HTS applications at politecnico di torino (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 2087-2094 
    Details
    ISSN: 0392-6737
    Keywords: Superconducting magnets and magnetic levitation devices ; superconducting cables and conductors ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary This paper deals with a comparison of chemical, physical and mechanical characterisation of YBCO samples obtained with Temporary-Liquid-Densification Melt Growth (TLDMG). Ba2YCu3O7-x +50% excess BaY2CuO5 pellets were prepared from different Ba-Y-Cu-O system phases, suitable to produce during the heat treatment temporary liquids at temperatures lower than 1000°C. A mechanical characterisation was performed in zero-field-cooling and field-cooling condition, showing hysteretic behaviour and creep of the levitation force. Measurements of magnetic hysteresis cycles in low fields and a.c. susceptibility were also performed. Some mechanical applications (high-speed electric motor and flywheel energy accumulator) were built and tested. The work now proceeds on two new industrial applications of melt-processed HTSC materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02471871
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  • 8
    Electronic Resource
    Electronic Resource
    Bidimensional magnetic coupling in layered compounds MeIILaFeO4 (MeII=Ca, Sr, Ba) (1986)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 8 (1986), S. 251-261 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF02450294
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Preparation and characterization of La"2Li"0"."5Al"0"."5O"4 with K"2NiF"4 structure
    Amsterdam : Elsevier
    Inorganica Chimica Acta 140 (1987), S. 147-149 
    Details
    ISSN: 0020-1693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0020-1693(00)81072-5
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    A One-Dimensional Cuprate Closely Related to the ''0212''-Structure: Nd"2Ba"4Cu"2O"9
    Amsterdam : Elsevier
    Journal of Solid State Chemistry 106 (1993), S. 271-281 
    Details
    ISSN: 0022-4596
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/jssc.1993.1286
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    Paper (German National Licenses)
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