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- Author or Editor: M. M. Karnowsky x
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Abstract
The surfaces of crushed salt /NaCl/ grains were equilibrated with36Cl– to produce a radioactive rim that was imaged by autoradiography. The tagged salt was compacted at pressures up to 138 MPa /20 000 psi/ for as long as 5 d to induce flow. Autoradiographs of the pressed salt show that plastic deformation /creep/ rather than pressure dissolution was the dominant compaction process under these short duration experimental conditions.
The phase changes in high-purity ammonium nitrate were studied by a differential thermal analysis (DTA) apparatus designed for constant heating and cooling rates and continuous cycling for ∼3-gram samples. On the basis of DTA and X-ray diffraction data very consistent behavior is observed. Phase IV → III transformation on heating in the range 43‡ to 51‡ and Phase II → IV transformation on cooling in the range 49‡ to 53‡ are demonstrated. The III → II transition at about 86→ is seen with repeated temperature cycling. This repeatable behavior not consistently seen by investigators using other techniques is believed to be due to the high purity material and constant heating and cooling rates.
