RARE EARTH GARNETS

RARE EARTH GARNETS
Author: Dr. Shesherao Shankarrao Jawale
Publisher: Lulu.com
Total Pages: 102
Release: 2019-09-03
Genre: Education
ISBN: 0359859496

Magnetic semiconductor ferrites were studied extensively due to their wide field of technological application. The crystal structure of these materials controls their physical properties. The electrical and magnetic properties of ferrites depend upon the method of preparation, nature of dopants, dopant concentration, etc. The properties of prime importance are resistivity, magnetization, curie temperature and permeability. All these properties can be modified so as to suit the desired application by selecting a suitable method of preparation, nature and type of dopant etc.

Handbook on Rare Earth Metals and Alloys (Properties, Extraction, Preparation and Applications)

Handbook on Rare Earth Metals and Alloys (Properties, Extraction, Preparation and Applications)
Author: NPCS Board of Consultants & Engineers
Publisher: ASIA PACIFIC BUSINESS PRESS Inc.
Total Pages: 557
Release: 2009-04-01
Genre: Science
ISBN: 8178331209

Rare earths are essential constituents of more than 100 mineral species and present in many more through substitution. They have a marked geochemical affinity for calcium, titanium, niobium, zirconium, fluoride, phosphate and carbonate ions. Industrially important minerals, which are utilized at present for rare earths production, are essentially three, namely monazite, bastnasite and xenotime. In modern time techniques for exploration of rare earths and yttrium minerals include geologic identification of environments of deposition and surface as well as airborne reconnaissance with magnetometric and radiometric equipment. There are numerous applications of rare earths such as in glass making industry, cracking catalysts, electronic and optoelectronic devices, medical technology, nuclear technology, agriculture, plastic industry etc. Lot of metals and alloys called rare earth are lying in the earth which required to be processed. Some of the important elements extracted from rare earths are uranium, lithium, beryllium, selenium, platinum metals, tantalum, silicon, molybdenum, manganese, chromium, cadmium, titanium, tungsten, zirconium etc. There are different methods involved in production of metals and non metals from rare earths for example; separation, primary crushing, secondary crushing, wet grinding, dry grinding etc. The rare earths are silver, silverymwhite, or gray metals; they have a high luster, but tarnish readily in air, have high electrical conductivity. The rare earths share many common properties this makes them difficult to separate or even distinguish from each other. There are very small differences in solubility and complex formation between the rare earths. The rare earth metals naturally occur together in minerals. Rare earths are found with non metals, usually in the 3+ oxidation state. At present all the rare earth resources in India are in the form of placer monazite deposits, which also carry other industrially important minerals like ilmenite, rutile, zircon, sillimanite and garnet. Some of the fundamentals of the book are commercially important rare earth minerals, exploration for rare earth resources, rare earth resources of the world, some rare earth minerals and their approximate compositions, rare earths in cracking catalysts, rare earth based phosphors, interdependence of applications and production of rare earths, uranium alloys, conversion of ores to lithium chemicals, characterization and analysis of very pure silicon, derivation of molybdenum metal, electoplating and chromizing, electrolytic production of titanium, heat treatment of titanium alloys, tensile properties of alloys etc. The book covers occurrence of rare earth, resources of the world, production of lithium metals, compounds derived from the metals, chemical properties of beryllium, uses of selenium, derivation of molybdenum metals, ore concentration and treatment and many more. This is a unique book of its kind, which will be a great asset for scientists, researchers, technocrats and entrepreneurs. 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The Physical Principles of Magnetism

The Physical Principles of Magnetism
Author: Allan H. Morrish
Publisher: Wiley-IEEE Press
Total Pages: 700
Release: 2001-01-15
Genre: Science
ISBN: 9780780360297

The IEEE Press is pleased to reissue this essential book for understanding the basis of modern magnetic materials. Diamagnetism, paramagnetism, ferromagnetism, ferrimagnetism, and antiferromagnetism are covered in an integrated manner -- unifying subject matter from physics, chemistry, metallurgy, and engineering. Magnetic phenomena are discussed both from an experimental and theoretical point of view. The underlying physical principles are presented first, followed by macroscopic or microscopic theories. Although quantum mechanical theories are given, a phenomenological approach is emphasized. More than half the book is devoted to a discussion of strongly coupled dipole systems, where the molecular field theory is emphasized. The Physical Principles of Magnetism is a classic "must read" for anyone working in the magnetics, electromagnetics, computing, and communications fields.

Rare Earth Element Geochemistry

Rare Earth Element Geochemistry
Author: P. Henderson
Publisher: Elsevier
Total Pages: 523
Release: 2013-10-22
Genre: Science
ISBN: 148328977X

Developments in Geochemistry, Volume 2: Rare Earth Element Geochemistry presents the remarkable developments in the chemistry and geochemistry of the rare earth elements. This book discusses the analytical techniques and the recognition that rare earth fractionation occurs naturally in different ways. Organized into 13 chapters, this volume begins with an overview of the wide array of types and sizes of the cation coordination polyhedral in rock-forming minerals. This text then examines the application of rare earth element abundances to petrogenetic problems that has centered on the evolution of igneous rocks. Other chapters consider the matching of observed rare earth element abundances with those provided by the theoretical modeling of petrogenetic processes. This book discusses as well the hypotheses on the genesis of a rock or mineral suite. The final chapter deals with the principal analytical methods. This book is a valuable resource for undergraduates, lecturers, and researchers who study petrology and geochemistry.

Optical Switches

Optical Switches
Author: S J Chua
Publisher: Elsevier
Total Pages: 345
Release: 2010-10-28
Genre: Technology & Engineering
ISBN: 0857090410

Optical communication using optical fibres as the transmission medium is essential to handling the massive growth of both telecom and datacom traffic. To fully realize the potential bandwidth available on these optical fibres, other components of the optical network system have to be developed, ranging from detectors and multiplexers to buffers and switches. This book addresses the different technologies which can be applied to switching optical signals.An optical switch functions by selectively switching an optical signal delivered through an optical fibre or in an integrated optical circuit to another. Several methods are available and each relies on a different physical mechanism for its operation. The various physical mechanisms used are discussed in the main chapters in the book which cover electro-optical, thermo-optical, micro-electro-mechanical (MEMS)-based and semiconductor optical amplifier (SOA)-based optical switches. The book also covers switching based on optical nonlinear effects, liquid and photonic crystal optical switches as well as fibre, holographic, quantum optical and other types of optical switches. Each chapter discusses the choice of materials, fabrication techniques and key issues in switch design.With its distinguished editors and international team of contributors, Optical switches: materials and design is a standard reference for the telecommunications industry and those researching this important topic. - Reviews this commercially significant area of research and addresses the different technologies which can be applied to switching optical signals - Provides a balanced look at the developments which can be defined as key trends in optical switches - Major optical switches including electro-optical, thermo optical and magneto-optical switches are discussed and the respective theory and principles of each explored

Micro- and Macro-Properties of Solids

Micro- and Macro-Properties of Solids
Author: Dinker B. Sirdeshmukh
Publisher: Springer Science & Business Media
Total Pages: 415
Release: 2006-09-02
Genre: Science
ISBN: 3540317864

This book addresses the most important aspects of solid state physics, reviewing basic properties, related experimental techniques, and summarizing research over six decades. In addition, Micro- and Macro-Properties of Solids provides data on new materials such as rare-earth metals, semiconductors, ferroelectrics, mixed-valence compounds, superionic conductors, optical and optoelectronic materials and biomaterials.

Bibliography

Bibliography
Author: Pierre Villars
Publisher: Walter de Gruyter
Total Pages: 1827
Release: 2012-12-21
Genre: Science
ISBN: 3110276658

By browsing about 10 000 000 scientific articles of over 200 major journals mainly in a 'cover to cover approach' some 200 000 publications were selected. The extracted data is part of the following fundamental material research fields: crystal structures (S), phase diagrams (also called constitution) (C) and the comprehensive field of intrinsic physical properties (P). This work has been done systematically starting with the literature going back to 1900. The above mentioned research field codes (S, C, P) as well as the chemical systems investigated in each publication were included in the present work. The aim of the Inorganic Substances Bibliography is to provide researchers with a comprehensive compilation of all up to now published scientific publications on inorganic systems in only three handy volumes.