ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1955.tb14913.x

出版商:Blackwell Publishing Ltd    

年代:1955

数据来源: WILEY

摘要:

The absorption of high‐frequency (60 kc. to 20 me. per second) sound waves in fused silica shows a large peak at low temperatures (30° to 50°K.). This absorption appears to result from some property of the glassy state since the absorption does not occur in crystalline silica. Data are presented showing the variation of rigidity and internal friction with temperature and frequency. It is shown that the source of the internal friction may be a structural relaxation. Some speculations are made on the nature of the structural relaxation and its relation to the glassy st

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1955.tb14914.x

出版商:Blackwell Publishing Ltd    

年代:1955

数据来源: WILEY

摘要:

Liquid and solid metallic salts in contact with glass hare been found to produce a potential drop across the glass‐salt interface which decays with time. A qualitative explanation of this phenomenon is offered in terms of the glass structure with relation to the adsorption and polarizability of the salt ions at the interfac

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1955.tb14915.x

出版商:Blackwell Publishing Ltd    

年代:1955

数据来源: WILEY

摘要:

In a nuclear reactor, quartz alters gradually to an amorphous form. Some of the property changes observed are (a) decreases in density, refractive indices, rotatory power, and birefringence, (b) disappearance of the α‐β transition, and (c) changes in the absorption spectrum. The properties of vitreous silica also alter in a nuclear reactor, the density and refractive index increasing somewhat. On heating the irradiated solids the properties alter in a complex man

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1955.tb14916.x

出版商:Blackwell Publishing Ltd    

年代:1955

数据来源: WILEY

摘要:

The thermal expansion of vitreous silica is negative at low temperatures. This negative expansion can be explained as being caused by the transverse vibrations of the oxygen atoms. The frequency of such vibrations, because of the structure of vitreous silica, decreases as the structure shrinks, and this decrease results in negative thermal expansion.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1955.tb14917.x

出版商:Blackwell Publishing Ltd    

年代:1955

数据来源: WILEY

摘要:

The system BaTiO3–CaTiO3was investigated from room temperature to 1900°C. by several different techniques. The system is characterized by extensive solid solution with a minimum at 18 wt.% CaTiO3. The extent of solid solution decreases rapidly with temperature from a maximum of approximately 30 wt.% in each end member at 1595°C. The temperature of the cubic‐hexagonal inversion in BaTiO3is raised very rapidly with additions of CaTiO3. The tetragonal‐cubic inversion in BaTiO3is lowered slightly to a minimum of 105°C. by the additions of CaTiO3. Within a wide composition region crystals of cubic BaTiO3solid solution may be grown directly from the melt, and at the minimum from a melt of the same com

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1955.tb14918.x

出版商:Blackwell Publishing Ltd    

年代:1955

数据来源: WILEY

摘要:

Research on the synthesis of mica was started in Japan in 1938. As the first step, compositions which crystallize easily were investigated. The next step was the determination of the temperature of crystallization from melts and the rate of crystal growth. Experiments with growing of crystals were performed and these fundamental properties were determined. Various types of mica were synthesized. The results of (1) the determination of temperature of crystallization and rate of growth of fluor‐phlogopite from melts and (2) studies on the isomorphism in the various types of synthetic mica, e.g., chemical composition, crystal size, refractive index, electrical properties, heat of crystallization, and temperature of crystallization, are summarized. The practical uses of both synthetic mica and glass‐bonded synthetic mica ceramics are descri

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1955.tb14919.x

出版商:Blackwell Publishing Ltd    

年代:1955

数据来源: WILEY