Synthesis, structure and luminescence properties of lanthanide compounds grown from phosphate-molybdate molten systems

The main crystallization trends of complex oxide compounds of lanthanides from alkaline phosphate-molybdate (tungstate) melts have been studied in light of structure - luminescence properties relationships. The regions of formation M
^I
3Ln(PO
4
)
2
, LnPO
4
, K
2
Ln(PO
4
)(M
^VI
O
4
), M
^I
M
^III
(M
^VI
O
4
)
2
from self flux systems M
^I
-P-Ln-O (M
^I
-alkaline metal; M
^VI
-Mo, W) have been defined. The influence of M
^I
/M
^VI
ratio in the initial melt has been shown to play the key role in solid phase formation and structural peculiarities of LnOx polyhedral condensation of compounds obtained.