Sodium Mass Transfer: II, Screening Test Data and Analysis

In 1959 the U. S. Atomic Energy Commission contracted with the General Electric Company to carry out a Sodium Mass Transfer investigation with the objective of evaluating three prospective steel construction materials for utilization in liquid sodium-cooled reactor systems operated in the temperature range of 600 to 1300 F. Six liquid sodium test loops were designed and built to implement the study of the three selected materials: AISI 316 stainless steel (316SS); 2 1/4 percent Chromium- 1 percent Molybdenum steel (2 1/4 Cr-1Mo), and 5 percent Chromium - 1/2 percent Molybdenum- 1/2 percent Titanium steel (5Cr-1/2Mo-Ti). This document reports and interprets extensive observations of the metallurgical effects noted after exposure of the materials to liquid sodium. This exposure was made under dynamic conditions in test runs of up to 3000 hours from the initial startup through December 1961

Superlattices: Progress and prospects

The current status of HgTe–CdTe superlattices is reviewed. The properties predicted for the superlattices have been studied qualitatively in the cases where both theory and experiment exist. In particular, it has been found by both infrared absorption and photoluminescence that band gaps of the superlattices are substantially less than those of the alloy with the same average composition. Theoretical studies have concentrated on the factors (strain, band offsets, interdiffusion) that could result in substantial deviation of the properties of the superlattices from those predicted by the original simple theories. Some of the areas requiring further development are reviewed and discussed

Infrared absorption measurement and analysis of HgTe–CdTe superlattices

The near-band-gap optical properties of superlattice are essential in determining the usefulness of these structures for application in infrared systems. In this paper we report on studies of a HgTe–CdTe superlattice. The optical characterization of the superlattice in the infrared was carried out by measuring its photoluminescence, transmission, and photoconductivity spectra. Results of these measurements as functions of temperature are presented, as are the theoretically calculated absorption spectra. We obtained good agreement between different measurement techniques and the theoretical model for the optical absorption and band gap