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UCRL-1056 Neptunium metal 1~s prepared on the milligram scale by reduction of NpF3 vli.th barium. The melting point was determined as 640 ± 1°C; the density was found to be 19.5 ± 0.5 gm. cm.-3. An apparatus designed for the measurement of the melting points of 10 to 1000 microgram samples of metals is described. *This research vms performed under the auspices of u.s. Atomic Energy Commission and was reported in 1-1B-IP-162 (January, 1947). Presented at ~he llSth National Meeting of the American Chemical Society at Chicagq, September 5, 1950. *i}Present address: Department of Chemistry, University of Hichigan, Ann Arbor, Michigan. I Present address: Department of Chemistry and Chemical Engineering, State University bf IoHa, Iotva City, Iowa.

The Melting Point and the Density of Neptunium Metal. A Micro Melting Point Apparatus for Metals1

The Melting Point and the Density of Neptunium Metal. A Micro Melting Point Apparatus for Metals¹