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Showing 1 to 13 of 13 for “"structural phase transitions"”.
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Ab initio statistical mechanics of structural phase transitions
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1987.
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Structural phase transitions in synthetic analogues of the titanite structure type
… of the driving forces behind displacive phase transitions in transition metal oxides. Towards this aim, synthetic derivatives of the mineral titanite, CaTiOSiO4, are used as model compounds. The study is focusing on the occurrence of displacive phase transitions in compounds with the …
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Superconductivity and the structural phase transitions in palladium hydride and palladium deuteride
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-21T13:29:37Z No. of bitstreams: 1 1980_standley.pdf: 4015384 bytes, checksum: b8540ee995293021214971faa8574bdc (MD5)
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Nuclear magnetic resonance investigations of structural phase transitions in silicon dioxide cristobalite and tridymite and related phases
… magnetic resonance (NMR) techniques in studying structural phase transitions (SPT's) of the SiO$\sb2$ cristobalite and SiO$\sb2$ and AlPO$\sb4$ tridymite polymorphs. The structural properties and SPT's of these phases have been of mineralogical, physical and industrial interest for decades. …
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Investigation of structural phase transitions in minerals and analogue systems by high-temperature magic-angle-spinning nuclear magnetic resonance spectroscopy
This work comprises studies of structural phase transitions (SPT's) in three different phases (anorthite CaAl$\sb2$Si$\sb2$O$\sb8$, Sr$\sb2$SiO$\sb4$, and AlPO$\sb4$-cristobalite) via high-resolution nuclear magnetic resonance spectroscopy using mostly magic-angle spinning (MAS) techniques. The …
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Ab initio study of magnetic effects at material interfaces .
… show that magnetism, in addition to driving structural relaxation, also greatly enhances intergranular cohesion in iron. To explore the effects of point defects at material interfaces, we present an extensive study of non-magnetic Molybdenum grain boundaries. This trend study which is carried …
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Modern spectroscopy on biological molecules : structure and bonding investigated by THz time-domain and transient phase-grating spectroscopy
… systems in the crystalline and amorphous phase. In particular the correlation between the observed low-frequency modes and molecular structure and association was investigated. Our results show that the mode structure in the THz region represents a unique fingerprint for the molecular …
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Advances in the modelling of in-situ powder diffraction data
… is a well-established technique to analyse structural and microstructural properties of materials. The possibility to record in-situ powder diffraction data allows studying changes within the structure and microstructure of a sample that occur in dependence on the applied external conditions …
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Temperature And Pressure Effects On Elastic Properties Of Relaxor Ferroelectrics And Thermoelectrics: A Resonant Ultrasound Spectroscopy Study
… properties. The material undergoes a series of structural phase transitions with changes in temperature and the chemical composition. The work covered in this dissertation seek to gain insight into the phase diagram of PMN-PT using temperature and pressure dependence of the elastic properties. …
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Vortex Configurations Of Bosons In Rotating Optical Lattices
… transition. We find a series of abrupt structural phase transitions where vortices are pinned with their cores only on plaquettes or only on sites. We discuss connections between these vortex structures and the Hofstadter-butterfly spectrum of free particles on a rotating lattice. We …
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Crystalline, Amorphous, and Liquid Metal-Organic Frameworks at Non-Ambient Conditions
… it was soon discovered how diverse the structural responses of these low-density materials are when, for example, heated or compressed. Such structural changes range from the simple loss of pore-occupying solvent molecules to intricate sequences of structural phase transitions. Some MOFs …
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Mesoscale Modeling of Phase Behavior in Thin Films of Cylinder-Forming ABA Block Copolymers
… The computational study of the equilibrium phase behavior in thin films is complemented by detailed comparison with a real experimental system. Additionally, the dynamics in such films at various length and time scales (the dynamics of individual defects and the dynamics of surface relief …
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Domain wall dynamics and neuronic crackling noise
… strain variations across each of the six known phase transitions of WO<sub>3</sub> in the temperature interval 5-1273 K. Analysis of strain/order parameter coupling reveals the character of each phase transition, a unified description of strain across the full temperature range, the relationship …