Patent Number: 
Section: claims

1. A direct synthesis method, comprising:reacting Na2(WO4)·2H2O with NaF in an inert atmosphere at a reaction temperature of about 950° C. to about 1400° C. 2. A direct synthesis method, comprising:reacting Na2(WO4)·2H2O with NaF and Na2[MO4]·H2O in an inert atmosphere at a reaction temperature of about 950° C. to about 1400° C. according to the reaction:(1−x)Na2[WO4]·2H2O+xNa2[MO4]·H2O+NaF→Na3W1−xMxO4Fwhere0≦x≦0.2; andM is B, Al, Si, P, S, Cr, V, Nb, Ta, Zr, Hf, Sc, Y, La, Ga, Ge, In, Mo, or combinations thereof. 3. The method as in claim 2, wherein x is 0 such that Na3(WO4)F is formed. 4. The method as in claim 3, wherein Na3WO4F is formed into single crystals having an impurity concentration present at a concentration of less than about 500 ppb. 5. The method as in claim 2, wherein 0<x≦0.2. 6. The method as in claim 5, wherein M is Mo such that Na3W1−xMoxO4F is formed. 7. A crystal structure comprising: Na3(WO4)F with impurities present in a concentration of less than about 500 ppb. 8. The crystal structure as in claim 7, wherein impurities are present in concentration of less than about 100 ppb. 9. A scintillator material comprising the crystal structure of claim 7. 10. A phosphor material comprising the crystal structure of claim 7. 11. A composition of matter having the formula:Na+3−a−2b−3cA+aB2+bC3+cW1−xMxO4Fwhere0≦a≦2;A+ is an alkali metal ion;0≦b≦1;B2+ is an alkaline earth metal ion selected from Be2+, Mg2+, Ca2+, Sr2+, and/or Ba2+, a rare earth divalent cation from the atomic numbers 57-71, an activator divalent cation of Cr, Mn, Re, Cu, Ag, Au, Zn, Cd, Hg, Sn, or any combinations thereof;0≦c≦1;C3+ is a rare earth trivalent cation from the atomic numbers 57-71, an activator trivalent cation of Ac, U, Cr, Mn, As, Sb, Bi, In, Tl, or any combinations thereof;0<x≦0.2; andM is B, Al, Si, P, S, Cr, V, Nb, Ta Zr, Hf, Sc, Y, La, Ga, Ge, In, Mo, or combinations thereof. 12. The composition of matter as in claim 11, where a=b=c=0 such that the composition of matter has the formula:Na3(W1−xMxO4)F,where0<x≦0.2, andM is B, Al, SL P, S, Cr, V, Nb, Ta, Zr, Hf, Sc, Y, La, Ga, Ge, In, Mo, or combinations thereof. 13. The composition of matter as in claim 11, wherein M is Mo. 14. The composition of matter as in claim 11, wherein impurities are present in a concentration of less than 500 ppb. 15. A scintillator material comprising the composition of claim 11. 16. A phosphor material comprising the composition of claim 11. 17. A composition having the formula:Na+3−a−2b−3cA+aB2+bC3+cW1−xMxO4Fwherea is 0;A+ is an alkali metal on;b is 0;B2+ is an alkaline earth metal ion selected from Be2+, Mg2+, Ca2+, Sr2+, and/or Ba2+, a rare earth divalent cation from the atomic numbers 57-71, an activator divalent cation of Cr, Mn, Re, Cu, Ag, Au, Zn, Cd, Hg, Sn, or any combinations thereof;0<c≦0.1;C is Ce, Eu, or a combination thereof;0≦x<0.2; andM is B, Al, Si, P, S, Cr, V, Nb, Ta, Zr, Hf, Sc, Y, La, Ga, Ge, In, Mo, or combinations thereof. 18. A crystal structure comprising: Na3(GeO4)F with impurities present in a concentration of less than about 500 ppb.