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  • 1
    Electronic Resource
    Electronic Resource
    E.S.R. studies on melinex irradiated with oxygen ions
    Amsterdam : Elsevier
    International Journal of Radiation Applications & Instrumentation. Part D, 16 (1989), S. 65-67 
    Details
    ISSN: 1359-0189
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/1359-0189(89)90014-9
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation esr of the hole trapped Tl^2^+ center in SrCl"2 crystals
    Amsterdam : Elsevier
    Solid State Communications 81 (1992), S. 215-217 
    Details
    ISSN: 0038-1098
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0038-1098(92)90392-M
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  • 3
    Electronic Resource
    Electronic Resource
    A study on Fe^+ centers in NaCl crystals
    Amsterdam : Elsevier
    Solid State Communications 53 (1985), S. 989-992 
    Details
    ISSN: 0038-1098
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0038-1098(85)90475-2
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  • 4
    Electronic Resource
    Electronic Resource
    Microwave Spectroscopy in YBCO Superconductors: Influence of Neutron Irradiation on the 123 Phase (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 327-330 
    Details
    ISSN: 1572-9605
    Keywords: Microwave spectroscopy ; YBaCuO ; 123 phase ; superconductivity ; neutron irradiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The high-T c superconducting system YBa2Cu3Oδ:Li (123) was investigated by microwave absorption. The effect of neutron irradiation on the 123 phase as well as the dependence of the resulting modification both on the neutron fluence and on the doping behavior with Li are discussed. The results show a significant improvement of the superconducting characteristics: critical temperature, phase homogeneity, and critical current densities for a certain neutron fluence. We have found that the optinum neutron fluence for irradiation is 4.98×1021 m−2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022619128787
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  • 5
    Electronic Resource
    Electronic Resource
    Metastable states of the 2223 phase in the Bi(Pb)SrCaCuO system (1996)
    Springer
    Journal of superconductivity 9 (1996), S. 277-280 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; Bi2Sr2Ca2Cu3O y ; microwave absorption ; critical temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract By the magnetically modulated microwave absorption method (MAMMA) we observed the modifications induced by different calcination temperatures (between 830°C and 870°C) on the 2223 phase formed in a system sintered at (855±5)°C with the starting composition Bi1.7Pb0.3Sr2Ca2Cu3O y . The presence of the 2223 phase in almost distinct states (consequently, multiple 2223 phases) in the same sample was observed. As the calcination temperature was increased up to 850°C, the highest temperature state of the 2223 phase intensified. Higher calcination temperatures resulted in the enhancement of other lower-temperature states. The homogeneity of the 2223 phase was greatly improved by annealing the samples at, 800°C for 5 min in a flowing nitrogen atmosphere. We labeled as “metastable” the lower-temperature states having excess oxygen, which, by easily losing the supplementary oxygen under the above annealing procedure, were shifted to higher temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00727548
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  • 6
    Electronic Resource
    Electronic Resource
    Studies on the Non-Isothermal Decomposition of H3PMo12O40·xH2O and H4PVMo11O40·yH2O (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 569-578 
    Details
    ISSN: 1572-8943
    Keywords: heteropolyacids ; isoconversional method ; non-isothermal analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract This paper reports a comparative study of the non-isothermal decompositions of the heteropolyacids HPM and HPVM, with structures consisting of Keggin units (KUs). Non-isothermal analysis at low heating rates demonstrated the existence of 4 crystal hydrate species, depending on the temperature. The stability domains of the anhydrous forms of HPM and HPVM were found to be 150–380°C, respectively. Processing of the TG curves obtained at different heating rates by the Ozawa method revealed that the decomposition of anhydrous HPM takes place according to a unitary mechanism, whilst for anhydrous HPVM two mechanisms are observed. Thus, the first part of the constitution water is lost simultaneously with the departure of vanadium from the KU as VO2+, while the second part is lost at higher temperatures as in the case HPM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010113013352
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  • 7
    Electronic Resource
    Electronic Resource
    Studies on the Thermal Decompositions of Heteropolynuclear Glyoxylates of Cr(III) and Cu(II) (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 579-586 
    Details
    ISSN: 1572-8943
    Keywords: decomposition mechanism ; glyoxylates ; heteropolynuclear complexes ; thermal analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Complexes of Cr(III):Cu(II) with the glyoxylate dianion as ligand were synthesized in the range of cation atomic ratios (0.01–8):1.0. The results of non-isothermal analysis of the synthesized compounds correlated with the results of IR and UV-VIS spectroscopy, and gas chromatography of the volatile products of the decomposition allowed the formulation of a mechanism for the decomposition of the complex with Cr(III):Cu(II)=2:1 and the assumption that the other complexes are mixtures of this with the homopolynuclear complexes of Cr(III) and Cu(II), depending on the ratio of the cations Cr(III):Cu(II). The thermal conversion of the complexes takes place at relatively low temperatures, with partial transformation of the ligand into oxalate and of the oxide mixture into CuCrO4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010165030191
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  • 8
    Electronic Resource
    Electronic Resource
    The influence of the structure on the electrical and magnetic properties of Bi2Sr2CaCu2O8+δ single crystals (1997)
    Springer
    Journal of materials science 32 (1997), S. 1195-1199 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The correlation between the structure, chemical composition, electrical and magnetic properties of Bi2Sr2CaCu2O8+δ single crystals is presented. As revealed by SEM measurements, the small samples (approximately 1 mm×1 mm×0.2 mm) are stacks of thin plates (1–2 μm). Microcompositional measurements (energy dispersive spectroscopy) show the Bi2Sr2CaCu2O8+δ (2212)-phase and a small quantity of residual phases enriched in bismuth and strontium and calcium-deficient. Magnetically modulated microwave absorption measurements (MAMMA) lead to a value for the anisotropy of the upper critical field of about 7, which is more than twice the reported value for YBa2Cu3O7-δ single crystals (also determined from MAMMA responses). The plot of the resistance versus temperature suggests that only the first 10–20 plates from the surface of the sample have a contribution to the sample conductivity. The imaginary part, X″, of the magnetic susceptibility of our samples shows three peaks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018579817471
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