Low temperature polymorph; single crystals; stabilization; tantalum oxide
The ""low temperature structure type"" of Ta2O5 has been found to occur in two distinct forms with the lowest temperature form having a unit cell 14 times the subcell and an intermediate temperature form with a unit cell 11 times the subcell. The...
High temperature polymorph; single crystals; stabilization; tantalum oxide
The high temperature, apparently tetragonal, polymorph of tantalum pentoxide can be obtained at room temperature by quenching a specimen containing 2-5 mole percent of the following oxides: SnO2, Ga2O3, Cr2O3, Fe2O3, Sc2O3, or MgO. All the x-ray...
The phase equilibrium relationships of the TiO2-Ta2O5 system were determined in air. An equimolar compound, TiTa2O7, was found to melt congruently at about 1662 C and have a monoclinic unit cell a = 20.297 , b = 3.804 , c = 11.831 , = 12014',...
The fatigue strengths of a low-alloy steel, a magnesium alloy, and a copper-beryllium alloy were increased by coating the specimens with certain polar organic compounds. Also the dispersion of the results was much less for coated specimens of those...
Creep-rupture tests were made on circumferentially notched Ti-8Al-1Mo-1V specimens at temperatures of 600, 800, 1000, and 1200 °F (588, 699, 811, and 921 K) with stresses to produce rupture times ranging from 1 min to several thousand hours. A...
Calculations have been made covering the predictions of a model representing the viscoelastic behavior of rubberlike polymers for molecular weights greater than Mc, Mc being the lower limit of the range in which the viscosity is proportional to...
The effect of small quantities of methyl bromide, up to 0.5 percent by volume, on the flame speed of methane-air mixtures has been determined. Maximum flame speeds, at given experimental conditions, are reduced proportionately to the amount of...