title: Synthesis, structure, and properties of Li2In2MQ6 (M = Si, Ge; Q = S, Se): a new series of IR nonlinear optical materials.
abstract: The four isostructural compounds Li(2)In(2)MQ(6) (M = Si, Ge; Q = S, Se) have been synthesized for the first time. They crystallize in the noncentrosymmetric monoclinic space group Cc with the three-dimensional framework composed of corner-sharing LiQ(4), InQ(4), and MQ(4) tetrahedra. The second-harmonic-generation signal intensities of the two sulfides and two selenides were close to those of AgGaS(2) and AgGaSe(2), respectively, when probed with a laser with 2090 nm as the fundamental wavelength. They possess large band gaps of 3.61(2) eV for Li(2)In(2)SiS(6), 3.45(2) eV for Li(2)In(2)GeS(6), 2.54(2) eV for Li(2)In(2)SiSe(6), and 2.30(2) eV for Li(2)In(2)GeSe(6), respectively. Moreover, these four compounds all melt congruently at relatively low temperatures, which makes it feasible to grow bulk crystals needed for practical application by the Bridgman-Stockbarger method.
authors.affiliation: Center for Crystal Research and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Wenlong
authors.initials: W
authors.lastname: Yin
authors.forename: Kai
authors.initials: K
authors.lastname: Feng
authors.forename: Wenyu
authors.initials: W
authors.lastname: Hao
authors.forename: Jiyong
authors.initials: J
authors.lastname: Yao
authors.forename: Yicheng
authors.initials: Y
authors.lastname: Wu