Elaboration and non linear properties of ortho-phosphate solid solutions AiBII 1-xMII xPO4 (AI = monovalent cation, BII & MII = divalent cations)

Abstract X-ray crystallography has allowed to identify new solid solutions with the formulae LiPb1–xMxPO4, NaBa1–yM′yPO4 and NaPb1–zSrzPO4. When M = Sr, Ba, × varies between 0.0 and 0.4 in the vicinity of LiPbPO4 and between 0.8 and 1.0 close to LiMPO4 while for M″=Sr, 0.2 ≤y≤0.8 and M″=Pb, 0.0 ≤y≤ 1.0. The third system corresponds to a continuous solid solution between z=0 and z=0.8. Phase transitions were determined along the solid solutions investigated. Second harmonic generation tests has shown that the highest yield frequency doubling was recorded for compounds of the systems LiPbPO4-LiMPO4 (M=Sr, Ba).