Power Thesaurus. 1969. pedometer thesaurus http://www.powerthesaurus.org/pedometer/synonyms (accessed August 31, 2017). Harvard. Power Thesaurus 1969, pedometer thesaurus, Power Thesaurus, viewed 31 August, 2017, <http://www.powerthesaurus.org/pedometer/synonyms>.
We would like to Buy Columbite with Nb2O5 45-55% min,Ta2O5 approx 5%, U3O8+ThO2 0.5% max. Niobium metal ingots 99.95%min.
Niobium in the Earth's crust comprises one stable isotope, 93 Nb. By 2003, at least 32 radioisotopes had been synthesized, ranging in atomic mass from 81 to 113. The most stable of these is 92 Nb with a half-life of 34.7 million years.