Phase equilibria diagrams, crystal growth peculiarities and Raman investigations of lead and sodium-bismuth tungstate–molybdate solid solutions

• PbMoO4–PbWO4 and NaBi(MoO4)2–NaBi(WO4)2 systems exhibit a complete mutual solubility.
• Distribution coefficients of molybdenum in the studied systems are differ from unity.
• Raman ν1(Ag) vibrations in NaBi(MoO4)2x(WO4)2−2x demonstrate two-mode behavior.

In this paper a comprehensive study of lead and sodium-bismuth tungstate–molybdate solid solutions was carried out, including the clarification of their structural peculiarities and phase diagrams of PbMoO4–PbWO4 and NaBi(MoO4)2–NaBi(WO4)2 systems, the study of spontaneous Raman spectra of these compounds, as well as preliminary experiments on single crystals growth of lead tungstate–molybdate. The linewidths, peak and integral intensities of the totally symmetric Raman vibrations of solid solutions were estimated in comparison with known SRS-active crystals. The conditions of the Czochralski growth of optically transparent lead tungstate–molybdate mixed crystals were found and SRS effect was observed in these crystals when pumping by 12 ns 1064 nm laser pulses.