Tantalum Specific heat

Properties Dark, reddish-brown liquid irritating fumes.Bp 58.8C, fp-7.3C, d 3.11 (20/4C), vap d vs. air (at 15C) 5.51, wt/gal 25.7 lb, specific heat 0.107 cal/g, refr index 1.647, dielectric constant 3.2. Soluble in common organic solvents very slightly soluble in water. Attacks most metals, including platinum and palladium aluminum reacts vigorously and potassium explosively. Dry bromine does not attack lead, nickel, magnesium, tantalum, iron, zinc, or (below 300C) sodium. 

Enthalpy measurements by Dennison et al. (1966a) (1774-1917 K) were corrected as above and also for tantalum saturation. The derived values are on average 7% higher than the selected values, while the derived specific heat at 38.6 8.0 J/(mol K) is of relatively low accuracy and abnormally high entropy of fusion of 11.1 J/(mol K) was obtained from these measurements. 

Fig. 3.1-1W Specific heat versus temperature of molybdenum, tungsten, niobium, and tantalum [1.126]...

Physical Properties.7—Tantalum is a white metal with a greyish tinge and is very similar to platinum in colour and general appearance. When it is heated to 1600° C. in vacuo it assumes a crystalline form.8 Examination of the powdered metal by X-ray analysis has shown that the arrangement of the atoms is on the plan of a body-centred cube of side 3 272 A, obtained by dividing the space of a crystal into equal closely packed cubes and placing an atom at each cube comer and each cube centre the distance between the nearest atoms is 2 883 A. The specific gravity of the fused metal is 16 6, - a sample drawn into wire 0 05 mm. diameter had a density of 16 5 10 the density calculated from X-ray data is 17 09.u... 

Tantalum(V) bromide forms pale yellow, tabular crystals of specific gravity 4.67. It is extremely hygroscopic and is decomposed in cold or hot water. It dissolves with reaction in methanol and ethanol, with the evolution of heat, forming clear solutions which give no precipitate upon dilution with water.2 Its solubility in carbon tetrachloride is 0.3921 and 1.4651 g./lOO ml. of solution at 20° and 30°,... 

Stabilizing is done on certain corrosion resistant stainless steels and nickel alloys containing titanium, niobium or tantalum to enhance corrosion resistance. They are heated to specific temperatures so that these elements combine preferentially with carbon, preventing any detrimental loss of... 

Tungsten, tantalum and molybdenum (more or less converted into MoSig) wires make excellent heating coils for specific applications. See R. Kieffer and F. Benesovsky [6] regarding compatibility of these metals with ceramic materials and insulating compoimds at high temperatures. 

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