Journal
INORGANIC CHEMISTRY
Volume 48, Issue 16, Pages 7516-7518Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic9010339
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Funding
- National Science Foundation [DMR-0645304, DUE-0511444, CRIF-02-34872, DMR-0652150]
- ACS PRF [47345-AC10]
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The semiconductors Li2CdGeS4 and Li2CdSnS4, which are of interest for their nonlinear optical properties, were synthesized using high-temperature solid-state and polychalcogenide flux syntheses. Both compounds were found to crystallize in Pmn2(1), with R1 (for all data) = 1.93% and 1.86% for Li2CdGeS4 and Li2CdSnS4, respectively. The structures of both compounds are diamond-like with the tetrahedra pointing in the same direction along the c axis. The alignment of the tetrahedra results in the structure lacking an inversion center, a prerequisite for second-harmonic generation (SHG). A modified Kurtz nonlinear optical powder technique was used to determine the SHG responses of both compounds. Li2CdGeS4 displayed a type 1 phase-matchable response of approximately 70x alpha-quartz, while Li2CdSnS4 displayed a type I non-phase-matchable response of approximately 100x alpha-quartz. Diffuse-reflectance spectroscopy was used to determine band gaps of 3.10 and 3.26 eV for Li2CdGeS4 and Li2CdSnS4, respectively.
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