“…Decomposition is carried out by passing a gaseous hydride, usually diluted with hydrogen, through the heated quartz tube. Similar results were also obtained by heating solid boron hydrides at 800-900 o C in a small boat (made of boron nitride) • Pyrolysis on an incandescent tungsten and tantalum (WIRTH and DIETZE, 1964;HINZ and WIRTH, 1965) filament results in formation of boron rods or films (SCHRANGLE and DIETZE, 1972) with crystalline structure.…”