11. Aluminium boride is considered a hazardous substance as it reacts with acids and hydrogen gas to produce toxic gases. 12. "' Iron boride "'refers to various inorganic compounds with the formula Fe x B y. 13. Cerium boride cathodes have one and half the lifetime of lanthanum boride, due to its higher resistance to carbon contamination. 14. Cerium boride cathodes have one and half the lifetime of lanthanum boride , due to its higher resistance to carbon contamination. 15. Boride cathodes are about ten times as " bright " than the tungsten ones and have 10 15 times longer lifetime.16. The preparation of amorphous nickel boride is simple compared with other borides which requires high temperatures, special techniques and equipment. 17. It is one of two chemical compounds that are commonly called aluminium boride ; the other is aluminium diboride, AlB 2. 18. Canfield said he and his colleagues at Iowa State and Ames have been working long hours seven days a week investigating magnesium boride . 19. Similar to yttrium, rare-earth metals from Gd to Lu can form REB 41 Si 1.2-type boride . 20. Cerium boride cathodes show lower evaporation rate at 1700 K than lanthanum boride, but it becomes equal at 1850 K and higher above that.
