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Infrared Spectra of Inorganic Dielectric Solids

Author: Johannes N. Plendl

Publisher:

Published: 1964

Total Pages: 28

ISBN-13:

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The lattice vibration spectrum of a solid has recently been characterized by one single frequency, which is defined as the frequency of the center of gravity of the spectrum, called 'centro-frequency.' Here the experimental determination of this frequency is shown in detail for a number of solids, the vibrational spectra of which became available recently. Emphasis is given to spectral data at various temperatures, from 4K to about 1000K, and at the various major crystallographic directions. The 'centro-frequencies' at room temperature and higher temperatures show almost no change; whereas, at low temperature the 'centrofrequencies' consistently show a very definite increase. The result reveals a definite increase in binding energy with temperature decrease. A considerably higher resolution, particularly in the broad band areas, was obtained with spectra at very low temperatures. (Author).

Book Synopsis Infrared Spectra of Inorganic Dielectric Solids by : Johannes N. Plendl

Download or read book Infrared Spectra of Inorganic Dielectric Solids written by Johannes N. Plendl and published by . This book was released on 1964 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lattice vibration spectrum of a solid has recently been characterized by one single frequency, which is defined as the frequency of the center of gravity of the spectrum, called 'centro-frequency.' Here the experimental determination of this frequency is shown in detail for a number of solids, the vibrational spectra of which became available recently. Emphasis is given to spectral data at various temperatures, from 4K to about 1000K, and at the various major crystallographic directions. The 'centro-frequencies' at room temperature and higher temperatures show almost no change; whereas, at low temperature the 'centrofrequencies' consistently show a very definite increase. The result reveals a definite increase in binding energy with temperature decrease. A considerably higher resolution, particularly in the broad band areas, was obtained with spectra at very low temperatures. (Author).

Infrared Spectra of Inorganic Dielectric Solids

Author: Johannes N. Plendl

Publisher:

Published: 1964

Total Pages: 0

ISBN-13:

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Book Synopsis Infrared Spectra of Inorganic Dielectric Solids by : Johannes N. Plendl

Download or read book Infrared Spectra of Inorganic Dielectric Solids written by Johannes N. Plendl and published by . This book was released on 1964 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lattice vibration spectrum of a solid has recently been characterized by one single frequency, which is defined as the frequency of the center of gravity of the spectrum, called 'centro-frequency.' Here the experimental determination of this frequency is shown in detail for a number of solids, the vibrational spectra of which became available recently. Emphasis is given to spectral data at various temperatures, from 4K to about 1000K, and at the various major crystallographic directions. The 'centro-frequencies' at room temperature and higher temperatures show almost no change; whereas, at low temperature the 'centrofrequencies' consistently show a very definite increase. The result reveals a definite increase in binding energy with temperature decrease. A considerably higher resolution, particularly in the broad band areas, was obtained with spectra at very low temperatures. (Author).

New Concepts in the Physics of Solids

Author: Johannes N. Plendl

Publisher:

Published: 1966

Total Pages: 98

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This work treats spectral and atomistic concepts derived from an analytical study of more than one hundred solids. The study deals with such characteristics as infrared spectra, specific heat, bulk-modulus, change of compressibility with pressure, lattice anharmonicity, exponent of repulsion, lattice cohesive energy, zero-point energy, hardness, and valence. Characterizing the lattice vibrations - that is, the infrared spectrum through one single frequency (the 'centro-frequency', defined by the center of gravity of the entire spectrum) - it is shown that an identical frequency may be derived as a mechanical analogy from the average velocity of sound determined, in this case, from the cubic compressibility. A thermodynamical analogy exists in the Debye frequency from specific heat. The 'centro-frequency' has proven to be the key to a successful formulation of the nonlinearity or anharmonicity of the attractive and repulsive forces in solids. The importance of anharmonicity for the understanding of the basic properties of solids from an atomistic point of view is shown through various applications. (Author).

Book Synopsis New Concepts in the Physics of Solids by : Johannes N. Plendl

Download or read book New Concepts in the Physics of Solids written by Johannes N. Plendl and published by . This book was released on 1966 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work treats spectral and atomistic concepts derived from an analytical study of more than one hundred solids. The study deals with such characteristics as infrared spectra, specific heat, bulk-modulus, change of compressibility with pressure, lattice anharmonicity, exponent of repulsion, lattice cohesive energy, zero-point energy, hardness, and valence. Characterizing the lattice vibrations - that is, the infrared spectrum through one single frequency (the 'centro-frequency', defined by the center of gravity of the entire spectrum) - it is shown that an identical frequency may be derived as a mechanical analogy from the average velocity of sound determined, in this case, from the cubic compressibility. A thermodynamical analogy exists in the Debye frequency from specific heat. The 'centro-frequency' has proven to be the key to a successful formulation of the nonlinearity or anharmonicity of the attractive and repulsive forces in solids. The importance of anharmonicity for the understanding of the basic properties of solids from an atomistic point of view is shown through various applications. (Author).

Technical Abstract Bulletin

Author:

Publisher:

Published:

Total Pages: 908

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Book Synopsis Technical Abstract Bulletin by :

Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 908 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Solid-liquid Phase Equilibrium in Binary Systems of Triphenyl Antimony with Biphenyl, Naphthalene, and Benzoic Acid

Author: Marvin S. Brooks

Publisher:

Published: 1965

Total Pages: 30

ISBN-13:

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Book Synopsis Solid-liquid Phase Equilibrium in Binary Systems of Triphenyl Antimony with Biphenyl, Naphthalene, and Benzoic Acid by : Marvin S. Brooks

Download or read book Solid-liquid Phase Equilibrium in Binary Systems of Triphenyl Antimony with Biphenyl, Naphthalene, and Benzoic Acid written by Marvin S. Brooks and published by . This book was released on 1965 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Infrared Spectra of Crystals

Author: Peter J. Gielisse

Publisher:

Published: 1965

Total Pages: 106

ISBN-13:

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Book Synopsis Infrared Spectra of Crystals by : Peter J. Gielisse

Download or read book Infrared Spectra of Crystals written by Peter J. Gielisse and published by . This book was released on 1965 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Growth of Single Crystals

Author: Charles S. Sahagian

Publisher:

Published: 1966

Total Pages: 74

ISBN-13:

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Single crystals of over 100 different electronically active materials have been synthesized using a variety of methods, including growth by flame-fusion, flux, melt, gel diffusion, low-temperature solution, vapor, as well as synthesis by ultra-high-pressure techniques. These crystals, including a large number of doped specimens, emphasize oxides, garnets, silicates, ferrites, fluorides, as well as a large variety of other electromagnetic materials. Charts are presented giving summary data on single crystals grown, percentage and kind of dopants, growth methods and apparatus, crystal dimensions and other physical characteristics, primary research interest or use, crystal system, class, space group, and pertinent references. Several of the growth methods and recent Laboratory accomplishments are described. (Author).

Book Synopsis The Growth of Single Crystals by : Charles S. Sahagian

Download or read book The Growth of Single Crystals written by Charles S. Sahagian and published by . This book was released on 1966 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single crystals of over 100 different electronically active materials have been synthesized using a variety of methods, including growth by flame-fusion, flux, melt, gel diffusion, low-temperature solution, vapor, as well as synthesis by ultra-high-pressure techniques. These crystals, including a large number of doped specimens, emphasize oxides, garnets, silicates, ferrites, fluorides, as well as a large variety of other electromagnetic materials. Charts are presented giving summary data on single crystals grown, percentage and kind of dopants, growth methods and apparatus, crystal dimensions and other physical characteristics, primary research interest or use, crystal system, class, space group, and pertinent references. Several of the growth methods and recent Laboratory accomplishments are described. (Author).

Report on Research at AFCRL

Author: Air Force Cambridge Research Laboratories (U.S.)

Publisher:

Published: 1965

Total Pages: 322

ISBN-13:

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Summaries are given of research in the following fields: upper atmosphere physics, microwave physics, space physics, terrestrial sciences, optical physics, data sciences, meteorology, solid state, aerospace instrumentation.

Book Synopsis Report on Research at AFCRL by : Air Force Cambridge Research Laboratories (U.S.)

Download or read book Report on Research at AFCRL written by Air Force Cambridge Research Laboratories (U.S.) and published by . This book was released on 1965 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summaries are given of research in the following fields: upper atmosphere physics, microwave physics, space physics, terrestrial sciences, optical physics, data sciences, meteorology, solid state, aerospace instrumentation.

Scientific and Technical Aerospace Reports

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Publisher:

Published: 1965

Total Pages: 1074

ISBN-13:

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1965 with total page 1074 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Infrared Absorption Spectra of Certain Inorganic Solids

Author: David O'Hara Mulgrew

Publisher:

Published: 1956

Total Pages: 110

ISBN-13:

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Book Synopsis Infrared Absorption Spectra of Certain Inorganic Solids by : David O'Hara Mulgrew

Download or read book Infrared Absorption Spectra of Certain Inorganic Solids written by David O'Hara Mulgrew and published by . This book was released on 1956 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: