Thermal decomposition of yttrium(III) propionate and butyrate

Thermal decomposition of yttrium propionate: film and powder

“…Also the results from elemental analysis (Table 1) propionates. Conversely, although the XRD pattern of the present work is similar to [19], there are significant differences between our FTIR and XRD pattern and those reported in the literature [16][17][18][19], also there are significant differences among the different structures reported in the literature. Indeed, in carboxylates, the carboxylate bond and the crystalline structure depend strongly on the presence of crystallization water [2,[26][27][28], so that the distance between the asymmetric and symmetric carboxylic bands [Δν= ν as (COO…”

“…The same volatiles where observed by Grivel [19] for the thermal decomposition of Y-Prop 3 in Ar, proposing the reaction scheme α (radical) shown in Fig. 1: the mechanism results in a single dTG peak and an oxycarbonate intermediate that then yields yttria.…”

“…In fact, there have been an increasing number of studies regarding the thermal decomposition of YBCO FF-precursor powders such as Yttrium acetate (YAc 3 ), Yttrium propionate (YProp 3 ) and the corresponding barium and copper salts [13][14][15]. However, so far, the thermal decomposition of Y-Prop 3 has been studied only in the form of powder [16][17][18][19]. In situ evolved gas analysis (EGA) was performed by means of quadrupole mass spectrometry (EGA-MS/Q) by [17,18] in air and in nitrogen, and with Fourier-transform infrared spectroscopy (EGA-FTIR) in argon by [19].…”

“…However, so far, the thermal decomposition of Y-Prop 3 has been studied only in the form of powder [16][17][18][19]. In situ evolved gas analysis (EGA) was performed by means of quadrupole mass spectrometry (EGA-MS/Q) by [17,18] in air and in nitrogen, and with Fourier-transform infrared spectroscopy (EGA-FTIR) in argon by [19]. The reported volatiles, even in inert atmosphere, are different, so that a univocal and general mechanism has not been established yet.…”

“…The reported volatiles, even in inert atmosphere, are different, so that a univocal and general mechanism has not been established yet. Also the literature shows differences in the temperature range in which the last stage takes place, reporting complete decomposition at 600°C [16][17][18], 700°C [17] or even at 1350°C [19]. Besides, despite the fact that water vapor is commonly used in the synthesis of YBCO FF tapes, none of the published papers analyze the effect of the presence of water vapor in the thermal decomposition of the metalorganic precursor [3,20].…”