Exploring mid- and far-infrared (MFIR) and even terahertz (THz) birefringent crystals with large optical anisotropy remains a great challenge. Herein,a novel THz birefringent material Ba_(6)In_(2)Ge_(2)Te_(15),which c...Exploring mid- and far-infrared (MFIR) and even terahertz (THz) birefringent crystals with large optical anisotropy remains a great challenge. Herein,a novel THz birefringent material Ba_(6)In_(2)Ge_(2)Te_(15),which contains the intriguing quasi-[Te_(5)]^(4-) chain,has been successfully synthesized and investigated. This compound displays an ultrawide transparent region (1.3–40.2 μm),exhibiting high transmittance from NIR to MFIR and even THz regions. Moreover,the birefringence of Ba_(6)In_(2)Ge_(2)Te_(15) equals 0.377@30–42 μm (7.1–10 THz) and 0.42@2.09 μm,which are larger than those of most of the reported chalcogenides,both properties surpassing commercial birefringent crystals YVO_(4) and TiO_(2). Furthermore,the first-principles calculations demonstrate that the large optical anisotropy originates from the non-bonded p orbitals of Te atoms in the quasi-[Te_(5)]^(4-) chains. This work might shed light on the follow-up design and exploration of THz birefringent materials.展开更多
In this work,Ba_(2)HgTe_(5),as the first compound identified in the Ba/Hg/Te system,has been successfully synthesized via a solid-state reaction.It crystallizes in the orthorhombic space group pnma and exhibits a 0D s...In this work,Ba_(2)HgTe_(5),as the first compound identified in the Ba/Hg/Te system,has been successfully synthesized via a solid-state reaction.It crystallizes in the orthorhombic space group pnma and exhibits a 0D structure composed of linear[HgTe_(2)]units and V-shaped[Te_(3)]units arranged in an alternating manner.The experimental and theoretical calculation results indicate that Ba_(2)HgTe_(5) is a potential IR birefringent material.展开更多
基金supported by the National Natural Science Foundation of China(grant no.22175190).
文摘Exploring mid- and far-infrared (MFIR) and even terahertz (THz) birefringent crystals with large optical anisotropy remains a great challenge. Herein,a novel THz birefringent material Ba_(6)In_(2)Ge_(2)Te_(15),which contains the intriguing quasi-[Te_(5)]^(4-) chain,has been successfully synthesized and investigated. This compound displays an ultrawide transparent region (1.3–40.2 μm),exhibiting high transmittance from NIR to MFIR and even THz regions. Moreover,the birefringence of Ba_(6)In_(2)Ge_(2)Te_(15) equals 0.377@30–42 μm (7.1–10 THz) and 0.42@2.09 μm,which are larger than those of most of the reported chalcogenides,both properties surpassing commercial birefringent crystals YVO_(4) and TiO_(2). Furthermore,the first-principles calculations demonstrate that the large optical anisotropy originates from the non-bonded p orbitals of Te atoms in the quasi-[Te_(5)]^(4-) chains. This work might shed light on the follow-up design and exploration of THz birefringent materials.
基金supported by the National Natural Science Foundation of China(grant no.22175190,51890862).
文摘In this work,Ba_(2)HgTe_(5),as the first compound identified in the Ba/Hg/Te system,has been successfully synthesized via a solid-state reaction.It crystallizes in the orthorhombic space group pnma and exhibits a 0D structure composed of linear[HgTe_(2)]units and V-shaped[Te_(3)]units arranged in an alternating manner.The experimental and theoretical calculation results indicate that Ba_(2)HgTe_(5) is a potential IR birefringent material.
