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  • 1
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Clear evidence about the influence of growth orientation on the stoichiometry of sputtered oxide thin films is reported and discussed. The growth of stoichiometric and of non-stoichiometric films is respectively obtained, from the same CaRuO3 target, on the surface of (110) and (100) perovskite substrates. Such phenomenon has been systematically investigated by deposition of pairs of samples in the same deposition run. Our data show that in samples deposited on (100) perovskites, Ca excess leads to the formation of a single Ca-rich phase with stoichiometry Ca1 + x Ru1-x O3, resulting in a dramatic effect on transport properties. Structural characterization based on X-ray diffraction proves that the orthorhombic structure is preserved in a wide stoichiometry range. The striking evidence that substrate orientation influences film stoichiometry is discussed in terms of growth kinetics and chemical properties of sputtered species.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Science & education 7 (1998), S. 451-469 
    ISSN: 1573-1901
    Source: Springer Online Journal Archives 1860-2000
    Topics: Natural Sciences in General
    Notes: Abstract This hypermedial project deals with a historical and conceptual approach to physics. The “core” of the project is a certain number of “case studies”, namely problems or phenomena recounted together with their different interpretations. All case studies present two levels of investigation: the first level is devoted to high school students, the second level is devoted to university students and high school teachers. Our project is directed at a new and better understanding and appreciation of scientific culture. Our methodology is a historical methodology: teaching physics and the history of physics are fellow-subjects. We are not interested in adding the history of physics to teaching physics, as an optional subject: the history of physics is “inside” physics. Since textbooks usually give one and only one explanation of each physical phenomenon – the “true” explanation – we would like, on the contrary, to present the phenomena together with different interpretations that factually occurred in the history of physics. We offer four different approaches to the subject of the case study: “A. Phenomena”, “B. Textbooks”, “C. History” and “D. Maps”. The basic unit of the hypermedia is the presentation , namely a coherent set of information endowed with a definite and complete meaning. From the media point of view, a presentation consists of pictures and/or animations, key-words and/or key-sentences and a speaker explanation. Each approach consists of a certain number of “presentations”.
    Type of Medium: Electronic Resource
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