By Ryan J. Moore
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Additional info for Lanthanum: Compounds, Production and Applications
It should be also noted that bands due to La–O–H vibrations are still present in the spectrum of the mixture activated for 1 min. Figure 21. 5 stoichiometry after milling for different time (a) and subsequent calcination of the sample milled for 15 min at different temperatures (b). Further milling results in the appearance of strong bands typical for Si–O vibration in apatite-type silicate at 492, 439 and 910 cm–1 accompanied by disappearance of La–O–H and C–O vibrations bands in La(OH)3 and La2O2CO3, respectively.
U. Hence, Fe does not incorporate in the apatite structure in the course of SiO2–La2O3– Fe2O3 mixture MA, but only after its subsequent calcination at temperatures >900ºC. However, using ceramic powders prepared via the milling allows to obtain dense pellets of Fe-doped apatites at a lower temperature and shorter time of sintering as compared with the conventional solid state method [48-49]. Thus, sintering of the activated mixtures at 1500ºC for 4 and 10 h results in the pellet density of 89 and 97 % of theoretical, respectively, while McFarlane has reported the pellet density 70–76 % of theoretical value for Fe- doped ATLS prepared via the conventional ceramic method and sintered at 1500ºC for 8 h .
For Al-doped samples of different composition and various Al-precursors, the calcination of MA products at 9001200ºC leads to complete interaction of unreacted SiO2 and lanthanum compounds, decomposition of carbonates and increase of ATLS crystallinity regardless of the MA time (Table 1-2). However, according to XRD (Table 2) and 27Al MAS NMR (Fig. 13), the Doped Lanthanum Silicates with the Apatite Structure … 19 secondary LaAlO3 is present after calcination depending on the sample stoichiometry and Alprecursor.
Lanthanum: Compounds, Production and Applications by Ryan J. Moore