“Pedagogik mahorat” Ilmiy-nazariy va metodik jurnal 2022, № 1
204
х=0.4
0,287
0,144
1,006
1,603
Na
0,4
K
0,6
WSbO
6
х=0.6
0,193
0,218
1,014
1,616
Na
0,6
K
0,4
WSbO
6
х=0.8
0,099
0,144
1,012
1,604
Na
0,8
K
0,2
WSbO
6
х=1.0
-
0,121
1,006
1,599
NaWSbO
6
Thermogravimetric studies show that the formation of pyrochlorine phases proceeds in several stages
and is characterized by low temperature (temperature range 297–623 K) and high temperature (temperature
range 653–1123 K) areas. Thus, the DTG curves of the initial mixture of (1-х)K
2
CO
3
-хNa
2
CO
3
-Sb
2
O
3
-WO
3
content record
the degradation processes, the decomposition of potassium carbonate, and the maxima
showing the oxidation of the trivalent driving ions to the pentavalent state (Fig.1, b).
In this case, the TG
curves show places where the mass of the samples does not change with increasing temperature (Fig.1, a).
This indicates that the phases of a particular composition are formed in these temperature ranges.
