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Structural aspects of pressure- and temperature-induced phase transitions in low-dimensional systems

URN to cite this document: urn:nbn:de:bvb:703-epub-2085-3

Title data

Bykov, Maxim:
Structural aspects of pressure- and temperature-induced phase transitions in low-dimensional systems.
Bayreuth , 2015 . - 179 P.
( Doctoral thesis, 2015 , University of Bayreuth, Faculty of Mathematics, Physics and Computer Sciences)

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Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract

This thesis reports on structural studies of low-dimensional systems MOCl (M = Sc, Ti, V, Cr, Fe) and TiPO4 subjected to non-ambient conditions. Transition metal oxychlorides MOCl have been investigated at high pressures in diamond anvil cells by means of single-crystal synchrotron X-ray diffraction and by complementary techniques including Raman and Mossbauer spectroscopies and powder X-ray diffraction. The results reveal a plethora of high-pressure phase transitions in MOCl. A structural analysis allowed to associate the driving forces of the transitions either with the optimization of crystal packing, with the enhancement of low-dimensional magnetic properties, or with changes in electronic structures. TiPO4 has been studied by means of single-crystal X-ray diffraction at low temperatures. A structural proof of the spin-Peierls transition in this compound has been obtained. Furthermore, a novel incommensurately modulated phase of TiPO4 has been discovered and characterized.

Abstract in another language

Inhalt der vorliegenden Arbeit sind Strukturuntersuchungen an den niedrig-dimensionalen Systemen MOCl (M = Sc, Ti, V, Cr, Fe) und TiPO4 als Funktion von Druck und Temperatur. Die Übergangsmetalloxichloride MOCl wurden bei hohen Drücken in Diamantstempelzellen mittels Einkristall-Synchrotron-Röntgenstrahlbeugung und den komplementären Methoden Raman- und Mössbauer-Spektroskopie und Pulver-Röntgenstrahlbeugung gemessen. Als Ergebnis konnte eine Vielzahl an Phasenumwandlungen von MOCl bei hohen Drücken gefunden werden. Die Analyse der Kristallstrukturen erlaubte es, als treibende Kraft der Phasenumwandlungen entweder die Optimierung der Kristallpackung, einhergehend mit einer Verstärkung der niedrig-dimensionalen magnetischen Eigenschaften, oder die Anderung in der elektronischen Struktur zu definieren. TiPO4 wurde mittels Einkristall-Röntgenstrahlbeugung bei tiefen Temperaturen gemessen und der strukturelle Beweis der Spin-Peierls-Umwandlung für diese Verbindung erbracht. Desweiteren wurde eine neue inkommensurabel modulierte Phase von TiPO4 gefunden und charakterisiert.

Further data

Item Type: Doctoral thesis (No information)
Keywords: High-pressure X-ray diffraction; low-dimensional systems; incommensurate crystallography
DDC Subjects: 500 Science > 500 Natural sciences
500 Science > 530 Physics
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography > Chair Crystallography - Univ.-Prof. Dr. Sander van Smaalen
Graduate Schools
Graduate Schools > University of Bayreuth Graduate School
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-2085-3
Date Deposited: 25 Jun 2015 10:07
Last Modified: 25 Jun 2015 10:07
URI: https://epub.uni-bayreuth.de/id/eprint/2085

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