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Chemical structures of volatile coordination precursor compounds: (a) Y(thd) 3 , (b) Ba(thd) 2 (tetraglyme), and (c) Cu(thd) 2 .
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... solid Y(thd) 3 was used for chemical vapor deposition of Y 2 O 3 (Fig. 1a) by injecting it at the rates of 25 to 50 mg/min in the form of powder into an evaporator heated to 250°C. Deposition was performed in a specially designed setup for CVD in the mode of continuous tape pulling at the rate of 1-8 ...
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Citations
... Temperatures of the beginning of formation of aluminates having composition of mix 1:1 -1373-1450 К, 3:5 -1523-1873 K. No of a technique can be successfully used for receiving the RZE monoaluminates of yttric group which are breaking up at high temperatures [11][12][13]. ...
... Often transitions to levels from J=5 and 6 (where J is full angular momentum which can be equal to L+S, L+S-1, L+S-2, …, |L-S|) aren't observed as position of the peaks corresponding to these transitions are outside ranges of lengths of waves of sensitivity of detectors on spektro-fluorimeters. Also in ranges the peaks corresponding to transitions from higher power levels 5D1, 5D2, 5D3, etc. can be observed. Splitting of a multiplet of 7FJ corresponds to the rule of intervals of Lande: the distance between levels with J and J+1 increases with increase in J, for example, the peak corresponding to transition 5D0→7F0 is located very close to 5D0→7F1, however the peak corresponding to transition 5D0→7F6 lies more than 50 nanometers further in IR the region, than 5D0→7F5 Change of a crystal basis, also leads to the shift of peaks that indicates stronger influence of the crystal field [11,16,17]. Crystalline europium (III) hydroxide, calcined at the temperature of the second endoeffect -280 °C, has: spatial group -hexogonal modification -P63/m; a=b=6.39, ...
The big relevance is acquired by issues of development of methods of receiving phosphors, and studying influence on their spectral characteristics of features of structure. Red phosphors which part compounds of europium are of particular interest. Ions of europium have such properties as rather big difference of energy between its resonant and the main levels, providing radiation in the visible range; not degeneracy of these levels; the most important transitions are poorly subject to effect of the crystal field; a good possibility of the theoretical description of the processes happening in the materials containing europium ions. Ranges of a luminescence of the system received by continuous joint sedimentation of hydroxides (CDH) of europium and aluminum at a stage of crystallization of amorphous products are measured. The complex research of the CDH system is conducted by methods of the physicochemical analysis: differential and thermal, IK-spectroscopic, X-ray phase, X-ray fluorescent, power dispersive. The dependence of intensity of a luminescence of a system, from synthesis conditions is analyzed: concentration of initial components, structures of firm phases, temperatures, time (after a year of aging).
