Accession Number:

AD0260915

Title:

HIGH-PRESSURE PHASE TRANSFORMATIONS IN LABORATORY MECHANICAL MIXERS AND MORTARS

Descriptive Note:

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK

Personal Author(s):

Report Date:

1961-06-28

Pagination or Media Count:

1.0

Abstract:

Pressure effects produced by mixing and grinding devices were studied for PbO2, CaCO3, MnF2, BeF2, SiO2, PbO, Sb2O3, B2O3, and BAsO4 transition pressures at room temperature were 10,000, 3,000, 9,500, 15,500, 13,500, 5,500, 10,000, 18,500, and 30,000 bars, respectively. Results showed that 1 grinding or mixing in both automatic mortars and Wig-L-Bug-type shakers not only can introduce appreciable amounts of surface and strain energy, but also can generally cause the formation of high-pressure phases 2 the effective maximum pressures obtainable in such instruments is not less than 15,000 bars and 3 in addition to the quasi-hydrostatic pressures, shearing stresses effect marked acceleration of the transformations.

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE