INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Mei Yan,Ru-Ling Tang,Wei Xu,Wenlong Liu,Sheng-Ping Guo
Zirconium/hafnium fluorides have recently been recognized as potential nonlinear optical (NLO) materials with short ultraviolet (UV) cutoff edges, which is significant in laser science and industry. The synthesis of noncentrosymmetric (NCS) materials based on centrosymmetric (CS) compounds by an isovalent cation substitution-oriented design is an emerging strategy in the NLO territory. Here, two isostructural and novel fluorides, CaBaMF8 (M = Zr (1), Hf (2)), have been synthesized through the combination of alkaline earth metals, zirconium/hafnium, and fluorine elements. They feature zero-dimensional and CS structures composed by an isolated MF8 (M = Zr, Hf) dodecahedron and dissociative Ca2+ and Ba2+ cations, and they display short UV cutoff edges (<200 nm) as well. Two three-dimensional fluorides Li2CaMF8 (M = Zr (3), Hf (4)) are obtained by replacing Ba with alkali metal Li atom, which not only represent phase-matchable second-harmonic-generation activities (0.36, 0.30× KH2PO4 (KDP)) at 1064 nm but also maintain short UV cutoff edges with high reflectance. This work has largely enriched the family of NCS zirconium/hafnium fluorides reaching the short UV region.
研究领域:
材料科学
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无机化学
·
光学材料
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晶体工程
·
非线性光学
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2024
·Vol. 8
·期 6
·1636-1642
·
IF 6
Dequan Jiang,Chen Li,Ting Wen,Ke Liu,Yingying Ma,En Chen,Tianyao Pei,Yonggang Wang
Exploring optoelectronic functional materials has been of growing interest, due to their potential applications in information and energy storage. Pressure, as a direct way of modulating the localized groups of materials, has the potential to induce significant changes in optoelectronic properties. Herein, we adopt the pressure method to synergistically modulate the configuration of dual functional groups in CsMoO3(IO3) (i.e., lone-pair electrons [IO3] and second-order Jahn–Teller [MoO6] groups). Under pressure, CsMoO3(IO3) undergoes an isostructural phase transition, resulting in multiple optoelectronic changes of the “colorless-to-brown” piezochromism, the second harmonic generation “on-to-off” transformation, and the enhancement of the photocurrent switching ratio (× ∼10 times). First-principles calculations are also employed to explain the structure–property relationship. This work will shed light on further advancements in functional materials with multiple optoelectronic properties in extreme environments.
研究领域:
材料科学
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凝聚态物理
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无机化学
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光学工程
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应用物理学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 9
·2304-2310
·
IF 5.934
Ru-Ling Tang,Chun-Li Hu,Bao-Lin Wu,Yan Chen,Jiang-Gao Mao
Herein, two new acentric borogermanates, namely, Ca2GeB2O7 and Ca1.78Cd0.22GeB2O7, were obtained by combining BO4 with a GeO4 tetrahedron. The structures of the isomeric Ca2GeB2O7 and Ca1.78Cd0.22GeB2O7 feature two-dimensional (2D) [GeB2O7] layers parallel to the ab plane in which a GeO4 tetrahedron corner is shared with four [B2O7] units; the divalent cations are filled in between layers. Ca2GeB2O7 and Ca1.78Cd0.22GeB2O7 display second-harmonic generation (SHG) intensity around 0.4 and 0.6 times that of KH2PO4 (KDP), respectively. Ca2GeB2O7 possesses a short UV absorption edge (about 194 nm). Thermal stability measurements show that Ca2GeB2O7 melts congruently at high temperatures, whereas Ca1.78Cd0.22GeB2O7 melts incongruently and becomes amorphous at high temperatures. Moreover, measurements of the optical properties as well as theoretical calculations of these two compounds were conducted.
研究领域:
材料科学
·
无机化学
·
光学材料
·
晶体工程
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 20
·4544-4552
·
IF 6.569
Xin-Rui Yang,Xin Liu,Zujian Wang,Xue-Bin Deng,He-Jie Lu,Yu-Jia Li,Xifa Long,Ling Chen,Li-Ming Wu
We report a new DUV transparent (<200 nm) noncentrosymmetric Na1.5Rb0.5PO3F·H2O compound crystallizing in the Pmn21 space group. This compound exhibits the second largest birefringence in the monofluorophosphate family, Δnobv. = 0.04 at 546 nm, which is attributed to the nearly uniform alignment of the P–F bonds. The SHG response is observed to be 0.55 × KDP at 1064 nm. More interestingly, the precise substitution of NH4+ with Na+/Rb+ cations in the well-known structure (NH4)2PO3F·H2O leads to a stepwise reconstruction of the hydrogen bond networks, which eventually alters the crystal symmetry and the optical properties.
研究领域:
材料科学
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晶体化学
·
光学材料
·
无机合成
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 5
·3350-3355
·
IF 3.201
Ailijiang Abudurusuli,Kui Wu,Shilie Pan
Four new quaternary chalcogenides A2Ba7Sn4Q16 (A = Li, Na; Q = S, Se) were successfully synthesized in vacuum-sealed silica tubes for the first time. All of them crystallize in the noncentrosymmetric (NCS) cubic I3d space group with the cell parameters ranging from 14.807 to 15.4163 Å and Z = 4, respectively. Interestingly, their isostructures are different from the structural transformations (from tetragonal to trigonal) appearing in previously reported Na2BaSnQ4 compounds. As observed in their structures, (Na/Ba)Q4 and SnQ4 units alternately connect with each other by sharing corners to build a three-dimensional (3D) framework structure with charge-balanced Ba cations located within tunnels, which is different from the observation that the Na atoms located inside the tunnels formed by the interconnection of the BaS8 and SnS4 units in Na2BaSnS4. Optical properties (diffuse-reflection, IR, and Raman spectra) were also systematically studied and the results indicate that their optical bandgaps are in the range from 1.75 to 2.5 eV. Moreover, the second harmonic generation (SHG) responses of the title compounds were also measured to be about 0.1–0.5 times higher than that of benchmark AgGaS2 under 2.09 μm radiation.
研究领域:
材料科学
·
无机化学
·
非线性光学
·
晶体学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 11
·3344-3350
·
IF 4
Wenhao Liu,Ming-Hsien Lee,Ruixin Guo,Jiyong Yao
Rare earth borates, a subset of the essential nonlinear optical (NLO) materials, have sparked a significant amount of attention in recent years. In self-fluxing systems, two non-centrosymmetric scandium borates with classical B5O10 groups, namely Rb7SrSc2B15O30 (I) and Rb7CaSc2B15O30 (II), were successfully discovered. Both I and II exhibit a short ultraviolet (UV) cutoff edge (<200 nm) and appropriate second-harmonic generation efficiency (∼0.76 × KH2PO4, ∼0.88 × KH2PO4 at 1064 nm, respectively). According to theoretical calculations, it is speculated that the band gap and NLO characteristics of these two compounds are mostly derived from the B5O10 group and the ScO6 octahedron. Due to the short cutoff edges of I and II, they may be considered as potential NLO materials in the UV and even deep UV spectral ranges. Furthermore, the advent of I and II adds to the diversity of rare earth borates.
研究领域:
无机化学
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材料科学
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固体化学
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非线性光学
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晶体工程
·
紫外光功能材料
✓ 已验证
DOI
高影响因子
Nano Research
·
2023
·Vol. 17
·期 3
·1173-1181
·
IF 9.9
Liu Kang,Wu Tong,Xu Luying,Zhang Zhuangzhuang,Liu Zhiyu,Wang Longfei,Wang Zhong Lin
The separation of photogenerated electron–hole pairs is vitally important for photocatalysis, which can be effectively promoted by polarization field. However, it only manifests in piezoelectric/pyroelectric/ferroelectric materials that have a non-centrosymmetric structure. Here, we demonstrate that the polarization enhanced photocatalysis (with wide spectra from ultraviolet (UV) light to visible light) can be achieved in centrosymmetric semiconductors, such as δ-MnO 2 and TiO 2 nanosheets integrated nanoflowers, by using the strain-gradient-induced flexoelectric polarization that is always overlooked in polarization-enhanced catalysis. Under ultrasonic and illumination excitation, the organic pollutants (methylene blue (MB), etc.) can be effectively degraded within 30 min with excellent stability and repeatability. Compared with photocatalysis, the flexo-photocatalytic performance of above centrosymmetric semiconductors is substantially increased by 85%. Moreover, the factors related to flexo-photocatalysis such as material morphology, mechanical stimuli source, and adsorption are explored to deeply understand the mechanism of flexo-photocatalysis. This work opens up a way for high-performance photocatalysis in centrosymmetric semiconductors.
研究领域:
光催化
·
材料科学
·
半导体物理
·
纳米技术
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）