Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Magnetic materials --- Phase transformations (Statistical physics) --- Congresses. --- Magnetic transition --- Order-disorder transition --- Phase transition --- Transport properties

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

In this study, I investigate layered oxide perovskites, specifically n=2 Dion-Jacobson phases with the formula AA′B2O7, using first-principles Density Functional Theory simulations. These materials are of interest due to their potential ferroelectric properties but are often under-explored and poorly characterized. I carefully calculate the force constants associated with phonon modes by utilizing the frozen-phonon technique in the symmetry-adapted mode basis. The coupling of different phonon modes happens only if it is symmetry-allowed, giving a natural tool to study phase transitions. Unstable modes are identified by a negative force constant; the eigenvalues of these modes can be frozen into the structure, which, after relaxation, results in a more stable material. The materials studied in this work are compounds with the formula ANdNb2O7 where A is Rb, Na, or NH4 cation. The ammonia molecule-containing phase is the primary compound of this study. The presence of various unstable phonon modes complicates the prediction of a definitive ground state; thus, I present several potential lower symmetry structures derived from the aristotype. These models serve as a basis for further experimental characterization and enhance our understanding of structure-property relationships, particularly the influence of aspherical cations on the material’s ground state structure. This research provides foundational insights into the dynamic properties of layered perovskites, paving the way for future studies on their practical applications in ferroelectric and other functional materials.

First-priciples --- Perovskite --- Functional materials --- Phase transition --- Physique, chimie, mathématiques & sciences de la terre > Physique

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

This book provides information on thermal energy storage systems incorporating phase change materials (PCMs) which are widely preferred owing to their immense energy storage capacity. The thermal energy storage (TES) potential of PCMs has been deeply explored for a wide range of applications, including solar/electrothermal energy storage, waste heat storage, and utilization, building energy-saving, and thermal regulations. The inherent shortcomings like leakage during phase transition and poor thermal conductivity hamper their extensive usage. Nevertheless, it has been addressed by their shape stabilization with porous materials and dispersing highly conductive nanoparticles. Nanoparticles suspended in traditional phase change materials enhance the thermal conductivity. The addition of these nanoparticles to the conventional PCM enhances the storage. In this book, the history of Nano Enhanced Phase Change Materials (NEPCM), preparation techniques, properties, theoretical modeling and correlations, and the effect of all these factors on the potential applications such as: solar energy, electronics cooling, heat exchangers, building, battery thermal management, thermal energy storage are discussed in detail. Future challenges and future work scope have been included. The information from this book can enable the readers to come up with novel techniques, resolve existing research limitations, and come up with novel NEPCM, that can be implemented for various applications.

Condensed matter. --- Solid-phase synthesis. --- Nanotechnology. --- Phase Transitions and Multiphase Systems. --- Phase Transition and Critical Phenomena. --- Solid-phase Synthesis.

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

This book provides a comprehensive yet concise knowledge and understanding in the field of Two-phase separation in the T-Junction. and this book can not only contribute to the academics, but it can also provide valuable insight for the industrial use of the T-junction. This book discusses in detail, the effect of different parameters on phase separation. These independent variables include diameter ratio, velocity ratio, individual phase velocities, side arm inclination, main arm inclination, mass split ratio, density of the working fluid, types of T-junctions used and modification in the T-Junction. The objectives and goals of this books are concerned with the research involved with the heat transfer applications, fluid mechanics and flow transmission in the petroleum field. Currently the data from the literature indicates that there is no specific source of consistent conclusion about the multiphase phenomenon. This book can provide a database ofknowledge keeping in view of all the previous studies of the recent decades.So, engineers performing their duties in their respective sector, graduate and Ph.D students in the field of engineering can get valuable information about Two Phase Separation in the T-Junction.

Condensed matter. --- Soft condensed matter. --- Phase Transitions and Multiphase Systems. --- Phase Transition and Critical Phenomena. --- Fluids. --- Separation (Technology)

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

541.5 --- Valencies. Bonds. Affinity --- 541.5 Valencies. Bonds. Affinity --- Iron compounds. --- Crystal structure --- Oxides --- Phase transition --- Photoelectron spectra --- Proteins --- Proteins, metallo --- Redox reaction --- Valence