EPR και IR μελέτη οργανικών συμπλόκων με χαλκό εις συμπυκνωμένη κατάσταση.

Abstract

ΜΕΛΕΤΗ ΤΩΝ IR KAI EPR ΦΑΣΜΑΤΩΝ ΣΥΜΠΛΟΚΩΝ ΧΑΛΚΟΥ ΜΕ ΟΡΓΑΝΙΚΟΥΣ ΥΠΟΚΑΤΑΣΤΑΤΕΣ-ΚΑΘΟΡΙΣΜΟΣ ΤΗΣ ΒΑΣΙΚΗΣ ΣΤΑΘΜΗΣ-ΣΥΝΘΕΣΗ ΤΗΣ ΒΑΣΙΚΗΣ ΣΤΑΘΜΗΣ.ΚΑΘΟΡΙΣΜΟΣ ΣΥΜΜΕΤΡΙΑΣ ΤΟΥ ΚΡΥΣΤΑΛΛΙΚΟΥ ΠΕΔΙΟΥ.ΧΑΡΑΚΤΗΡΙΣΜΟΣ ΣΥΜΠΛΟΚΩΝ.ΧΡΗΣΙΜΟΠΟΙΗΘΗΚΑΝ IR,UV, KAI EPR ΦΑΣΜΑΤΟΣΚΟΠΙΑ.Η ΣΥΜΜΕΤΡΙΑ ΤΟΥ ΚΡΥΣΤΑΛΛΙΚΟΥ ΠΕΔΙΟΥ ΟΡΘΟΡΟΜΒΙΚΗ ΑΚΟΜΑ ΚΑΙ ΣΤΙΣ ΠΕΡΙΠΤΩΣΕΙΣ,ΠΟΥ ΟΙ ΓΕΙΤΟΝΕΣ ΤΟΥ ΚΕΝΤΡΙΚΟΥ ΙΟΝΤΟΣ ΗΤΑΝ ΟΜΟΙΟΙ.Η ΚΥΜΑΤΟΣΥΝΑΡΤΗΣΗ ΠΟΥ ΠΕΡΙΓΡΑΦΕΙ ΤΗ ΒΑΣΙΚΗ ΣΤΑΘΜΗ ΗΤΑΝ ΜΕΙΓΜΑ ΤΩΝ ΤΡΟΧΙΑΚΩΝ \Χ^2-Υ^2>ΚΑΛ\Ζ^2>.Η ΕΝΤΑΣΗ ΤΗΣ ΦΑΣΜΑΤΙΚΗΣ ΓΡΑΜΜΗΣ ΤΟΥ EPR ΦΑΣΜΑΤΟΣ ΕΞΑΡΤΑΤΑΙ ΑΠΟ ΤΗ ΘΕΡΜΟΚΡΑΣΙΑ ΣΥΜΦΩΝΑ ΜΕ ΤΟ ΝΟΜΟ U1/T.

IN PART A IS DISCUSSED THE DIFFUSIONAL PHASE TRANSFORMATIONS WHICH OCCUR IN VARIOUS ALLOY SYSTEMS(A1-LI,A1-ZN,SI) THROUGH THE FORMATION OF PRECIPITATES.IN PART B IS STUDIED THE MAGNETIC BEHAVIOUR OF AMORPHOUS(FE-ZR) AND POLYCRYSTALLINE(FE-A1) ALLOYS WHICH EXHIBIT SPIN-GLASS BEHAVIOUR.FOR THESE STUDIES SMALL ANGLE NEUTRON SCATTERING(SANS) IS USED WHICH GIVES INFORMATION FOR STRUCTURAL FLUCTUATIONS OF THE ORDER 1 TO 100NM WHICH IS THE RANGE OF THE SIZE OF THE PRECIPITATES AND THE EXTENT OF THE FLUCTUATIONS AT THE PHASE TRANSITIONS.IT HAS BEEN DEVELOPED A SCALING THEORY OF THE SANS CURVES AND OF THE DEDUCED PRECIPITATE PARAMETERS EXPRESSED AS UNIVERSAL FUNCTIONS.SANS RESULTS FROM TWO DIFFERENT SYSTEMS, POLYCRYSTALLINE A1-ZN ALLOY AND SI SINGLE CRYSTAL CONTAINING PPM OXYGEN,ARE IN EXCELLENT AGREEMENT WITH THIS SCALING THEORY.THE SANS THEORY FOR A SYSTEM OF PARTICLES IS EXTENDED IN ORDER TO INCLUDE SIZE DISTRIBUTIOM EFFECTS AND IT IS SHOWN THAT THE PARAMETERS DERIVED FROM SANS EXPERIMENTS CAN BE EXPRESSED AS FUNCTIONS OF THE MOMENTS OF THE SIZE DISTRIBUTION.THE KINETICS OF THE PHASE TRANSFORMATION OF A1-LI ALLOYS HAVE BEEN STUDIED BY IN SITU AND BY STATIC SANS EXPERIMENTS BY WHICH THE EVOLUTION OF THE MICROSTRUCTURE IS DETERMINED AS A FUNCTION OF AGEING TIME AND TEMPERATURE.IT IS SHOWN BY DISSOLUTION EXPERIMENTS AT HIGH TEMPERATURES THAT THE TEMPERATURE AND TIME DEPENDENT SIZE OF THE PRECIPITATES CAN BE PREDICTED VERY WELL USING THE KINETIC CONSTANTS DERIVED FROM THE GROWTH EXPERIMENTS.THE MAGNETIC SCATTERING FROM THE AMORPHOUS ALLOYS FE100-XZRX AND FROM THE POLYCRYSTALLINE ALLOY FE70AI30 IS STUDIED AS