Examination of the vapor pressure-temperature relationship, log p vs. log T/p

The equilibrium vapor pressure of magnesium over the reaction between magnesium oxide and aluminum was measured by means of the transportation method. In the temperature range 850–1150 °C the results can be expressed by the equation log Pmm of Hg = −9617/T + 8.93. From X-ray diffraction analysis this reaction proceeds according to the equilibrium[Formula: see text]

Benzylamine Tartrate as an Organic Glass Substrate for Carbon Films by Evaporation

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100069417 ◽

1970 ◽

Vol 28 ◽

pp. 484-485

Author(s):

A. C. Faberge

Keyword(s):

Vapor Pressure ◽

Viscous Liquid ◽

Glass Substrate ◽

Room Temperature ◽

Carbon Film ◽

Carbon Films ◽

Organic Glass ◽

Spectroscopic Examination ◽

Polymeric Substrates

Benzylamine tartrate (m.p. 63°C) seems to be a better and more convenient substrate for making carbon films than any of those previously proposed. Using it in the manner described, it is easy consistently to make batches of specimen grids as open as 200 mesh with no broken squares, and without individual handling of the grids. Benzylamine tartrate (hereafter called B.T.) is a viscous liquid when molten, which sets to a glass. Unlike polymeric substrates it does not swell before dissolving; such swelling of the substrate seems to be a principal cause of breakage of carbon film. Mass spectroscopic examination indicates a vapor pressure less than 10−9 Torr at room temperature.

Hydration Chamber for Jeolco 200 Kv Microscope

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100069703 ◽

1970 ◽

Vol 28 ◽

pp. 542-543

Author(s):

V. R. Matricardi ◽

G. G. Hausner ◽

D. F. Parsons

Keyword(s):

Electron Microscope ◽

Water Vapor ◽

Vapor Pressure ◽

Pressure Gradient ◽

Room Temperature ◽

List Type ◽

Type Number ◽

Equilibrium Vapor Pressure

In order to observe room temperature hydrated specimens in an electron microscope, the following conditions should be satisfied: The specimen should be surrounded by water vapor as close as possible to the equilibrium vapor pressure corresponding to the temperature of the specimen.The specimen grid should be inserted, focused and photo graphed in the shortest possible time in order to minimize dehydration.The full area of the specimen grid should be visible in order to minimize the number of changes of specimen required.There should be no pressure gradient across the grid so that specimens can be straddled across holes.Leakage of water vapor to the column should be minimized.