Ausdehnungsmessungen bei tiefen Temperaturen

Ebert, Hermann

doi:10.1007/bf01331943

Cited by 37 publications

(8 citation statements)

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“…The in-plane thermal contraction (AL/~73K) of a mica measuredly Ebert [1928] down to 20 K is given in Figure 9.4.8. interlocking of these mica crystallite, crack propagation is arrested, resulting in thermal-shock resistance and machinability to precise tolerances with conventional tools used for working metal.…”

Section: Thermal Expansionmentioning

confidence: 99%

Cryogenic Properties of Inorganic Insulation Materials for ITER Magnets: A Review

Simon¹

1994

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Section: Thermal Expansionmentioning

confidence: 99%

Cryogenic Properties of Inorganic Insulation Materials for ITER Magnets: A Review

Simon¹

1994

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“…r------ 15 '\ percent) than the four samples of phlogopite mica discussed above, but there is a similarity in the shapes of the expansion curves. The similarity is more apparent after the fu'st heating.…”

Section: Physical Properties 1 Thermal Expansionmentioning

confidence: 81%

“…The expansion curves of four samples of biotite micas are shown ill figures 16 to 19, inclusive. These curves are irreversible on the heating and cooling cycles.…”

Section: Physical Properties 1 Thermal Expansionmentioning

confidence: 99%

“…The power factors 16 of some samples of muscovite and phlogopite micas were determined at 100 and 1,000 kc/s in terms of a type 722-N General Radio precision condenser. The samples were in the form of 16-mm (%-in.…”

Section: Power Factors By E L Haulsmentioning

confidence: 99%

“…H Zwetsch [20] found a change in the X-ray spectra of muscovite mica above 600· C. 15 Electrical Divisiou, National Bureau of Standards. " A tentative method of test for power factor of mica has been published [22] .…”

Section: Power Factors By E L Haulsmentioning

confidence: 99%

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Some physical properties of mica

Hidnert¹,

Dickson²

1945

J. RES. NATL. BUR. STAN.

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This paper gives data on the linear thermal expansion, changes in structure, power factors, and effects of heat treatments on the thickness, opacity, and color of micas (muscovite, phlogopite, biotite, ripidolite, and zinnwaldite)from different domestic and foreign sources. Tremendous linear thermal expansion was noted for some samples of phlogopite and biotite micas in a direction perpendicular to the cleavage plane. The transitions shown in the expansion curves of these samples at elevated temperatures appear to be related to the structural changes indicated in the X-ray diffraction patterns. Heat treatment of two phlogopite micas and two muscovite micas to 600 0 C, with or without a load, caused considerable increases in the power factors of the former and only slight changes in the latter. Nearly all the muscovite samples showed the greatest increases in thickness (up to 155 percent) after heat treatment at 800 0 C. The large increases in thickness of nearly all the muscovite samples accompanied changes from clear or translucent to opaque, or from polychrome to metallic color. None of the species of mica can be considered as a substance or material of fixed and reproducible properties. The physical properties of mica depend largely upon the chemical composition, the nature of the crystals, their magnitude and orientation, the presence of impurities, the way in which these enter the structure, the heat treatment, etc. Some of the phlogopite and biotite micas that possess tremendously high thermal expansion in a direction perpendicular to the cleavage plane may be used for high-expanding elements in temperature-responsive devices but may be unsatisfactory for use in devices in which large changes in dimensions with changes in temperature are not desirable. CONTENTS P"ge

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Über eine dynamische Methode zur Bestimmung der Temperaturabhängigkeit der elastischen Konstanten stabförmiger Proben bei tiefen Temperaturen

Goens¹

1930

Annalen der Physik

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Ausdehnungsmessungen bei tiefen Temperaturen

Cited by 37 publications

References 0 publications

Cryogenic Properties of Inorganic Insulation Materials for ITER Magnets: A Review

Cryogenic Properties of Inorganic Insulation Materials for ITER Magnets: A Review

Some physical properties of mica

Über eine dynamische Methode zur Bestimmung der Temperaturabhängigkeit der elastischen Konstanten stabförmiger Proben bei tiefen Temperaturen

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