Formation pathway, structural characterization and optimum processing parameters of synthetic topaz – Al2SiO4(OH,F)2 – by CVD

Thermoluminescent characterization of Al2O3-derived synthetic topaz

“…For instance, the same research group reported the synthesis of topaz starting from aluminum hydroxide (Al(OH) 3 ), focusing the work on structural characterization and optimum processing parameters, though the thermoluminescent properties were not characterized [26]. Albeit some investigations on the thermoluminescent properties of natural topaz have been published in the related literature, specific information on synthetic topaz has not yet been reported.…”

Thermoluminescent composites of sintered synthetic-topaz/in situ corundum for dosimetry by a novel reversible process

“…Significant progress has been made by developing different materials of natural topaz [ [8] , [9] , [10] , [11] ], synthetic topaz [ [12] , [13] , [14] , [15] , [16] , [17] , [18] , [19] , [20] , [21] ], beach sand-Teflon composites [ 22 , 23 ], wollastonite-Teflon composites [ 24 ], citrine-Teflon [ 25 ], and natural topaz composites [ 1 , 7 , [26] , [27] , [28] ]. Recently, sintered synthetic topaz/corundum compounds – obtained by the hybrid-system chemical vapor deposition or HYSY-CVD route, developed at CINVESTAV-Saltillo [ [29] , [30] , [31] ]– with thermoluminescent behavior were reported [ 32 ].…”

“…In topaz synthesis by HYSY-CVD, when Na 2 SiF 6 is heated, the silicon precursor SiF 4(g) is released and dragged by the inert gas flow throughout the cylindrical reaction chamber. Silicon tetrafluoride (SiF 4 ) gas subsequently reacts with the Al(OH) 3 (aluminum hydroxide) tablet as a substrate, which acts as a nucleation center to produce the stable solid topaz phase [ [12] , [13] , [14] , 32 , 33 , 37 ].…”

Topaz synthesis using Al2O3, Al(OH)3 or Al2Si2O5(OH)4 and color centers promoting its radioluminescence response

“…It is thus reasonable to think that synthesized topaz would help exploiting its full potential in its response to radiation. Recently, authors synthesized topaz (Al 2 SiO 4 (OH,F) 2 ) by CVD and reported its structural characteristics, formation pathway and optimum processing conditions [5].…”