Author: Dinesh C. Gupta
Publisher: LAP Lambert Academic Publishing
ISBN: 9783846582787
Category :
Languages : en
Pages : 120
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Book Description
The work has been performed by developing a model potential which includes effects due to covalency, charge transfer due to outer most electrons of the cation and zero point energy interactions. The potential is used to derive expressions for second- and third-order elastic constants (SOECs and TOECs), thermo-physical properties and pressure derivatives of SOECs. The computed results are capable to explain successfully the SOECs, Cauchy's discrepancy in SOECs and their pressure derivatives, phase transition pressures, volume collapse, and thermal properties. The present results are close to experimental data and better than those computed earlier by others. Present model potential can be used for the similar properties of other compounds too.
Author: K.A. Gschneidner
Publisher: Elsevier
ISBN: 9780444513236
Category : Science
Languages : en
Pages : 688
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Book Description
This volume of the Handbook illustrates the rich variety of topics covered by rare earth science. Three chapters are devoted to the description of solid state compounds: skutterudites (Chapter 211), rare earth -antimony systems (Chapter 212), and rare earth-manganese perovskites (Chapter 214). Two other reviews deal with solid state properties: one contribution includes information on existing thermodynamic data of lanthanide trihalides (Chapter 213) while the other one describes optical properties of rare earth compounds under pressure (Chapter 217). Finally, two chapters focus on solution chemistry. The state of the art in unraveling solution structure of lanthanide-containing coordination compounds by paramagnetic nuclear magnetic resonance is outlined in Chapter 215. The potential of time-resolved, laser-induced emission spectroscopy for the analysis of lanthanide and actinide solutions is presented and critically discussed in Chapter 216.
Author: Van E. Wood
Publisher:
ISBN:
Category :
Languages : en
Pages : 44
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Book Description
Research on preparation of, characterization of, and physical-property measurements on rare-earth compounds of technological potential is described. Work was in four areas: magnetoferroelectric materials, narrow-band narrow-gap semiconductors, rare-earth pnictides, and cooperative excitation of luminescence of rare-earth ions in insulators. In the first area, study of heavy rare-earth manganites and chromites and their solid solutions has been emphasized. Ranges of solid solution and weak ferromagnetism have been determined for Yb compounds. High pressure orthorhombic phases of Y, Ho and Yb manganites were shown to be antiferromagnetic. Work is in progress to determine the extent of ferroelectricity in all of the systems prepared. In narrow-band narrow-gap materials, it was attempted to determine the nature of a localized excited state in SmB6 in order to understand the conductivity transition. However, work on very well characterized SmB6 has thus far been inconclusive. Work on the pnictides was primarily on production of near-stoichiometric oxygen-free samples of DyN for magnetic resonance studies. Finally, studies on two-photon infrared-excited red fluorescence of Ho(3+) ions in CaF2 have established that at ion concentrations greater than about 0.5% the fluorescence arises from cooperative energy transfer between Ho(3+) ions rather than from successive excitation of a single ion. (Author).
Author: Aditi Rukmangad
Publisher: LAP Lambert Academic Publishing
ISBN: 9783847330790
Category :
Languages : en
Pages : 128
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Book Description
During the past few years, the high pressure structural phase transition in Rare Earth Compounds has been studied extensively. These materials are mostly ionic in nature; crystallize in the rock salt structures at ambient pressure. In the rare earth compounds, the electrons hybridized between two states, which have nearly equal energy. These properties have been correlated with existence of unfilled f electron shell of RE ions, which therefore interact strongly with the lattice. In the present book a theoretical model has been used in order to understand the effect of f- electrons on phase transition, elastic, mechanical and lattice dynamical properties. The necessity of the development of present two body ineriionic potential model and various interactions required essentially for a complete account of the cohesion in RE compound have been described.We have also discussed Breathing Shell Model (BSM) theory to calculate complete phonon spectrum, density of states and specific heat of Neptunium Chalcogenides in this book.
Author: Gary Neal Chesnut
Publisher:
ISBN:
Category : High pressure (Science)
Languages : en
Pages : 92
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Book Description
Author: W. A. Westall
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: W. A. Westall
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Rostam Mondegarian
Publisher:
ISBN:
Category : Rare earths
Languages : en
Pages : 162
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Book Description
Author: Meng He
Publisher:
ISBN: 9783736993303
Category :
Languages : en
Pages : 124
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Book Description
Author: Howard G. Brown
Publisher: University of Virginia Press
ISBN: 9780813927299
Category : History
Languages : en
Pages : 484
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Book Description
"Filled with critical insights, Brown's revisionist study utilizes an impressive array of archival sources, some only recently cataloged, to support his thesis that the French Revolution survived until 1802 and the Consulate regime.... This volume should be a priority for all historians and serious students interested in modern French history. Summing Up: Essential."--Choice "What Brown has done is to put all historians of the French Revolution in his debt by the thoroughness with which he explores an important aspect of the complex and interrelated problems posed by any attempt to create a new social and moral order based on principles that could prove to be self-contradictory and were neither understood nor welcomed by a substantial proportion of the population."--English Historical Review "This is one of the most important pieces of scholarship on the French Revolution since the 1989 bicentennial."--David Bell, Johns Hopkins University For two centuries, the early years of the French Revolution have inspired countless democratic movements around the world. Yet little attention has been paid to the problems of violence, justice, and repression between the Reign of Terror and the dictatorship of Napoleon Bonaparte. In Ending the French Revolution, Howard Brown analyzes these years to reveal the true difficulty of founding a liberal democracy in the midst of continual warfare, repeated coups d'état, and endemic civil strife. By highlighting the role played by violence and fear in generating illiberal politics, Brown speaks to the struggles facing democracy in our own age. The result is a fundamentally new understanding of the French Revolution's disappointing outcome. Howard G. Brown, Professor of History at Binghamton University, State University of New York, is the author of War, Revolution, and the Bureaucratic State: Politics and Army Administration in France, 1791-1799 and coeditor of Taking Liberties: Problems of a New Order from the French Revolution to Napoleon. Winner of the American Historical Association's 2006 Leo Gershoy Award and the University of Virginia's 2004 Walker Cowen Memorial Prize for an outstanding work of scholarship in eighteenth-century studies
