In the Y2O3-AI2O3-B2O3 system, homogeneous glasses were obtained from compositions containing from 50 to 65 mol% B203. The density, refractive index, and thermal expansion increase as Y 2 0 3 replaces either B2O3 or AI203. These glasses have a dilatometric softening temperature above W C , and below 300°C their dc electrical resistivity exceeds that of fused silica. The infrared absorption spectra indicate that B03, B04, and AIO, groups are present in these glasses.[
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A 235-cm-diam torus has been fabricated for plasma containment during thermonuclear fusion experiments. This 30-cm-diam torus consists of sixty 99.5%-alumina segments, 80% of which are ^.â ssembled by forming vacuum-tight ceramic-to-^QSi£• :~: >~, ceramic seals. Selection of sealing materials "\!|ifVM and techniques are discussed. "'-''"
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