SCHEDULED MAINTENANCE
Form-controlled synthesis of polymorphic nonlinear optical crystal CsMgPO4·6H2O
Abstract
A facile solution method for the morphology-controlled synthesis of CsMgPO4·6H2O was reported in this work and the key factor was determined to be the pH value of solution. The pure hexagonal phase (P63mc) was obtained at the pH range of 6.9~8.0 while the cubic phase (F4-3m) at 9.5~11.3. Compared with the cubic phase, the hexagonal phase of CsMgPO4·6H2O possessed a stronger Second Harmonic Generation response of 0.82 pm V-1 due to the distortion of the PO4 motif from regular tetrahedron. The form-controlled synthesis mechanism was identified by the aid of infrared spectroscopy that the protonation process reduced the symmetry of the PO4 motif when the solution pH decreased resulting that hexagonal phase of CsMgPO4·6H2O crystallized with the distorted PO4 tetrahedron in the lower pH range.
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