Combustile tubes, loaded with sample powders, have demonstrated their utility in screening pure and catalyzed monopropellant oxidizer burning rates. Tests have been run at pressures from 1 to 100 atmospheres; and various perchlorates and nitrates have been tested. Divalent cation doping of A.P. large single crystals has proven to be extremely difficult. Tests are proceeding with Ba(++). Concurrent tests in other laboratories have demonstrated burning rate modification of propellants containing devalent ion doped, granular A.P. DTA tests have shown that both tetraphenyl thiophene and its precursor tetraphenyl cyclopentadienone have the high stability useful for combustion modification. (Author)
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