Sn3B10O17Cl2 was successfully
obtained for the first time under the sealed environment and crystallized
in the space group Pbcn belonging to the orthorhombic
system, which is featured by the fundamental building blocks [B5O11] that are linked to construct a three-dimensional
framework with Cl and Sn atoms located inside and at the edge of the
channel to balance the charge. Moreover, the optical performance measurement
shows that Sn3B10O17Cl2 owns a cutoff edge of about 280 nm. Theoretical study indicates
its large optical anisotropy with the birefringence 0.125@546 nm;
meanwhile, the structure–performance relationships were analyzed
by the first-principle calculation.
The
development of high-power solid-state lasers is in urgent need
of new infrared nonlinear optical (IR NLO) materials with a wide band
gap and a high laser-induced damage threshold. A new infrared nonlinear
optical material Na2Ga2SiS6 has been
synthesized for the first time, crystallizing in the Fdd2 (no. 43) noncentrosymmetric space group. Its three-dimensional
tunnel framework consists of two typical NLO active motifs [GaS4] and [SiS4], with Na+ cations located
inside the tunnels. Na2Ga2SiS6 exhibits
comprehensive optical properties, namely, a wide transmission range,
a high laser-induced damage threshold (10 × AgGaS2), a type-I phase-matching second-harmonic generation response (0.2
× AgGaS2), and especially a wide band gap (3.93 eV),
which is the largest in the A2MIII
2MIVQ6 (A = alkali metals; MIII =
IIIA elements; MIV = IVA elements; Q = S and Se) family.
Therefore, Na2Ga2SiS6 does not produce
two-photon absorption under a 1064 nm laser pump and could be used
in high-energy laser systems, which makes Na2Ga2SiS6 a promising candidate for high-energy IR NLO applications.
Two new tin(II) phosphates, Sn II Sn IV (PO 4 ) 2 and SrSn(PO 4 )PO 2 (OH) 2 , were synthesized by the high-temperature solution method and hydrothermal method, respectively. Theoretical study indicates that by introducing tin(II) with stereochemical activity lone pairs (SCALP) in metal phosphates, the birefringence was enhanced, 0.048@1064 nm for Sn II Sn IV (PO 4 ) 2 and 0.080@1064 nm for SrSn(PO 4 )PO 2 (OH) 2 .
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