Defects and Phase Transformations in Cobalt Ferrites

<p>Defects and phase transformations in ferrimagnetic cobalt ferrites with a Co/Fe ratio between 0.5^ and 0.76' have been studied by means of high voltage transmission electron microscopy. The origin and characterization of ion radiation damage ferrimagnetic domains dislocations and phase transformations in tdr and in the electron microscope are discussed. Chemicil polishing and subsequent irradiation of specimens in the 650 kV microscope produces defects in the crystal surface facing the gun. These defects are mainly spherical oxygen vacancy clusters but occasionally small prismatic vacancy loops are formed. The projected<br>o 2 saturation defect concentration is about 2^10 per cm. Existing multiple beam dynamical theory has been used to quantitatively compare computed and actual dislocation images. It has been found<br>that under the proper diffracting couditions dislocation can be characterized by the spacing of the subsidiary image fringes parallel to the dislocation line so that the magnitude of the Burgers vector can 0 be determined directly 'fhe dislocation partials are at most 50A apart. The usefulness of the transmitted beam image with systematic higher order reflections operating is shown. This method appears to be preferable<br>over the kinematical weak beam method when the foil is of normal thickness.</p><p>This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact and remains as true to the original work as possible. Therefore you will see the original copyright references library stamps (as most of these works have been housed in our most important libraries around the world) and other notations in the work.</p><p>This work is in the public domain in the United States of America and possibly other nations. Within the United States you may freely copy and distribute this work as no entity (individual or corporate) has a copyright on the body of the work.</p><p>As a reproduction of a historical artifact this work may contain missing or blurred pages poor pictures errant marks etc. Scholars believe and we concur that this work is important enough to be preserved reproduced and made generally available to the public. We appreciate your support of the preservation process and thank you for being an important part of keeping this knowledge alive and relevant.</p>