Optical properties and crystal growth of lead tetraborate

Pb2B3O5.5(OH)2 and [Pb3(B3O7)](NO3): Facile Syntheses of New Lead(II) Borates by Simply Changing the pH Values of the Reaction Systems

“…These PbO 4 and PbO 5 polyhedra are highly distorted because of the lone pair electrons of the lead(II) cations, the Pb–O bond lengths range from 2.253(6) to 2.957(7) Å and O–Pb–O vary from 73.8 (2) to 129.86(19)°, which are comparable to those reported in other lead(II) borates. − Both B(1) and B (2) are tetrahedrally coordinated by one hydroxyl group and three oxo anions whereas B(3) is tetrahedrally coordinated by four oxo anions. These tetrahedra are slightly distorted with the B–O distances ranging from 1.40(2) to 1.517(12) Å and B–O–B bond angles in the range of 100.7 to 115.8(10)°, which are in good agreement with those reported previously in other lead borates. − , The calculated total bond valences for Pb1, Pb2, B1, B2, and B3 are 1.98, 1.98, 3.01, 2.95, and 3.07, respectively. O(1) and O(6) atoms are assigned to be hydroxyl group with the calculated bond valences of −1.09 …”

“…A number of lone pair electrons containing metal borates with excellent SHG properties have been reported, including Pb 4 O(BO 3 ) 2, γ-/δ-BiB 3 O 6 , Se 2 (B 2 O 7 ), Pb 2 B 5 O 9 I, Cd 4 BiO(BO 3 ) 3 , and Cd 5 (BO 3 ) 3 F . A numbers of lead(II) borates with clusters, chains, layers, or three-dimensional (3D) famework structures ,, have been reported. Lead(II) borates with highly asymmetric bonds favor SHG activity based on bond polarizability theory .…”

A new congruent-melting oxyborate, Pb4O(BO3)2with optimally aligned BO3triangles adopting layered-type arrangement

“…It should be noticed that PbB 4 O 7 has been widely researched due to its many attractive features, highly asymmetric bonding, high mechanical strength, ease of crystal growth and transparency in the deep UV region and fairly low hygroscopic nature. [25][26][27] However, the material has very small birefringence, and the angle phase matching for SHG is not possible with this crystal. In our research, we combined the layered-type arrangement of BO 3 triangles and the stereo-effect of the lone pair of the Pb 2+ cation to generate a novel oxyborate, Pb 4 O(BO 3 ) 2 which is expected to possess a large birefringence.…”

High-order stimulated Raman scattering and cascaded nonlinear lasing effects in crystals of (χ(3)→ χ(2))-active orthorhombic PbB4O7

“…e) Sellmeier coefficients: λ is in µm, (the refractive indices were determined in the wavelength range 0.365 -1.083 µm using the prism method and corrected with the refractive index of air; ξ 2 is the sum of the squares of the residuals). See also [16,17]. with site symmetry m, all other atoms are in general position with site symmetry 1.…”