Guoqiang Liu

Chinese Academy of Sciences

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Co-Authors

Xiaojian Tan

Ningbo Institute of Industrial Technology

120

Jun Jiang

Chinese Academy of Sciences

106

Haoyang Hu

Ningbo Institute of Industrial Technology

Hezhu Shao

Wenzhou University

Peng Sun

Jilin University

Jingtao Xu

Chinese Academy of Sciences

Qiang Zhang

China State Construction Engineering (China)

Jiehua Wu

Ningbo Institute of Industrial Technology

Zhe Guo

Chinese Academy of Sciences

Jianfeng Cai

Ningbo Institute of Industrial Technology

Cooperative Institutions

Chinese Academy of Sciences

216

Ningbo Institute of Industrial Technology

116

University of Chinese Academy of Sciences

105

University of Science and Technology of China

South China University of Technology

Huazhong University of Science and Technology

Central South University

Tsinghua University

Northeastern University

Fudan University

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Fast fabrication of SnTe via a non-equilibrium method and enhanced thermoelectric properties by medium-entropy engineering

Journal of Materials Chemistry C (2023)

Haojian Su Yemao Han Liancheng Xie Mingyue Jiang Zekun Wang

SnTe thermoelectric materials with low lattice thermal conductivity were synthesized by a self-propagating method under high-gravity field.

10.1039/d3tc00077j

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Citations (7)

Synergistically Optimized Thermal Conductivity and Carrier Concentration in GeTe by Bi–Se Codoping

ACS Applied Materials & Interfaces (2022)

Liang Xu Gang Wu Ruoyu Wang Zipeng Yan Jianfeng Cai

The GeTe compound has been revealed to be an outstanding thermoelectric compound, while its inherent high thermal conductivity restricts further improvement in its performance. Herein, we report a study on the synergistic optimization of the thermoelectric performance of GeTe by Bi-Se codoping. It is shown that the introduction of Bi decreases the carrier concentration and increases the structural parameter of the interaxial angle. With Se doping in the Te site, the lattice thermal conductivity is markedly reduced, while the carrier mobility is slightly influenced. Compared with the singly Se-doped GeTe, the Ge1-xBixTe1-ySey samples are more closed to a cubic phase, as indicated by the larger interaxial angle. On account of the reduction of carrier concentration and thermal conductivity, a ZTmax of 1.80 at 665 K and a high ZTave of 1.39 (400-800 K) are obtained in Ge0.94Bi0.06Te0.85Se0.15. This work reveals that the interaxial angle is vital to the performance optimization of rhombohedral GeTe.

Electron Mobility

Trigonal crystal system

10.1021/acsami.2c00546

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Citations (15)

A first-principles study on the phonon transport in layered BiCuOSe

Scientific Reports (2016)

Hezhu Shao Xiaojian Tan Guoqiang Liu Jun Jiang Haochuan Jiang

First-principles calculations are employed to investigate the phonon transport of BiCuOSe. Our calculations reproduce the lattice thermal conductivity of BiCuOSe. The calculated gruneisen parameter is 2.4~2.6 at room temperature, a fairly large value indicating a strong anharmonicity in BiCuOSe, which leads to its ultralow lattice thermal conductivity. The contribution to total thermal conductivity from high-frequency optical phonons, which are mostly contributed by the vibrations of O atoms, is larger than 1/3, remarkably different from the usual picture with very little contribution from high-frequency optical phonons. Our calculations show that both the high group velocities and low scattering processes involved make the high-frequency optical modes contribute considerably to the total lattice thermal conductivity. In addition, we show that the sound velocity and bulk modulus along $a$ and $c$ axes exhibit strong anisotropy, which results in the anisotropic thermal conductivity in BiCuOSe.

Lattice (music)

Grüneisen parameter

Phonon scattering

10.1038/srep21035

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Citations (46)

Anchorage Performance of Rebars in Uhpc-Filled Connections of Prefabricated Tunnels: Pull-Out Tests and Bending Tests

Fan Mo Kaisheng Wu Shengze Wu Haibo Jiang Kaihua Liu

Prefabricated tunnel joints, crucial for connecting concrete components, require excellent mechanical performance and construction convenience. However, the current joint technology cannot fully meet the requirements. This article introduces a new connection for prefabricated components, which was called rebar lap-spliced UHPC-filled connections, based on a Guangzhou tunnel engineering. It is noted that anchorage plate was mounted at the end rebar to assume the connection safety. To ensure the feasibility of this novel connection in practical engineering, 12 pull-out specimens and 6 bending specimens were designed and fabricated, to investigate the effects of the splicing length of steel bars and the thickness of UHPC layer on the cracking patterns, failure mode, and load-displacement/strain relation. The anchorage mechanism and the theoretical calculation of flexural capacity were further discussed. When thickness of UHPC, spacing and overlap length of rebars are ≥10 cm, 5 cm, and 15 cm, respectively, it can ensure that the connection has good anchoring performance. In the bending test, there was no cracking phenomenon in the UHPC layer, and the crack first occurred at the UHPC-NC interfaces. The design formulae and Response-2000 software for the theoretically flexural calculations could accurately predict the experimental ones of bending specimens. The research results can provide technical support for the promotion and application of the new connections for tunnel prefabricated components.

Rebar

10.2139/ssrn.5084925

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Ketorolac for postoperative orthopedic pain in adults

Qian Li Hao Xie Jin Zhao Wenying Yan Wenfei Huang

Sensitivity analysisWe intend to conduct sensitivity analyses by removing studies with nonself-reported pain scores.However, inadequate sensitivity data analysis was necessary. Country(ies) involvedChina.

10.37766/inplasy2023.6.0076

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Ba₉Lu₂Si₆O₂₄:Ce³⁺: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

Advanced Optical Materials (2015)

Yongfu Liu Jianxin Zhang Changhua Zhang Jingtao Xu Guoqiang Liu

Among the inorganic phosphors used in advanced solid‐state lighting technologies, nitridosilicates have drawn significant attention because of their superior photoluminescence properties with high efficiency and high thermal stabilities. However, the synthesis of nitride phosphors usually requires strict processing conditions and a long processing time, leading to very high manufacturing costs. Herein, a novel orthosilicate green phosphor, Ba 9 Lu 2 Si 6 O 24 :Ce 3+ , is synthesized via a simple solid‐state reaction. The photoluminescence characterization identifies a main peak at 400 nm in the excitation spectrum, making it viable for near‐UV LED excitation. This phosphor exhibits a broad emission band with a width of nearly 120 nm, peaking at 490 nm. By optimizing the Ce 3+ concentration, an internal quantum efficiency (QE) as high as 82% can be achieved, which is equivalent to that of most nitride phosphors. Furthermore, nearly 94% of the room‐temperature internal QE is still maintained at 160 °C, which is superior to that of most nitride phosphors. The excellent thermal stability and luminescent properties show this compound to be a promising candidate as a green phosphor for near‐UV‐based white LEDs.

Orthosilicate

Thermal Stability

Quantum Efficiency

Solid-State Lighting

10.1002/adom.201500078

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Citations (173)

Texturing degree boosts thermoelectric performance of silver-doped polycrystalline SnSe

NPG Asia Materials (2017)

Xue Wang Jingtao Xu Guoqiang Liu Xiaojian Tan Debo Li

Tin selenite (SnSe) has attracted significant attention due to its record thermoelectric figure of merit (ZT=2.6 at 923 K) of its single crystal. However, the polycrystalline SnSe processes considerably less ZTs (⩽1.1). In this study, we investigate the thermoelectric properties of Ag-doped polycrystalline SnSe, which was synthesized via zone melting and hot pressing. By comparing our results and previous reports of Ag-doped single crystals and polycrystals, we determine that the high texturing degree is essential for achieving good thermoelectric performance in polycrystalline SnSe. The zone-melted Sn0.99Ag0.02Se shows better thermoelectric performance than the Ag-doped SnSe single crystal in the entire temperature range, exhibiting a peak ZT of 1.3 at 793 K. An alloying process improves the performance of materials useful for recovering energy from waste heat, scientists in China have shown. The ability to convert waste heat from manufacturing industries into electricity offers a way to significantly enhance energy efficiency. The materials that can achieve this – thermoelectrics – are assessed by a parameter referred to as ZT: the higher the figure the better. Jingtao Xu, Jun Jiang, and co-workers from the Ningbo Institute of Materials Technology and Liaoning University have enhanced the thermoelectric properties of polycrystalline tin selenide by adding silver using a method known as zone melting, increasing its ZT from 1.1 to 1.3. The researchers believe the improvement is a result of texturing of the material and suggest that this idea could be applied to other materials. SnSe has a layered-like crystal structure and shows high thermoelectric performance along the b-crystal axis. Due to low textured degree, polycrystalline SnSe process poor electrical properties and overall thermoelectric performance. Here, we show that by increasing the textured degree, enhanced thermoelectric performance with a peak ZT of 1.3 at 793 K is achieved in Ag-doped SnSe polycrystals.

Figure of Merit

Hot pressing

Zone melting

10.1038/am.2017.147

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Citations (52)

Coulomb-Enhanced Spin-Orbit Splitting: The Missing Piece in theSr2RhO4Puzzle

Physical Review Letters (2008)

Guoqiang Liu V. N. Antonov O. Jepsen O. K. Andersen

The outstanding discrepancy between the measured and calculated (local-density approximation) Fermi surfaces in the well-characterized, paramagnetic Fermi liquid ${\mathrm{Sr}}_{2}{\mathrm{RhO}}_{4}$ is resolved by including the spin-orbit coupling and Coulomb repulsion. This results in an effective spin-orbit coupling constant enhanced 2.15 times over the bare value. A simple formalism allows discussion of other systems. For ${\mathrm{Sr}}_{2}{\mathrm{RhO}}_{4}$, the experimental specific-heat and mass enhancements are found to be 2.2.

Coupling constant

Spin–orbit interaction

Formalism (music)

10.1103/physrevlett.101.026408

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Citations (111)

Designing band engineering for thermoelectrics starting from the periodic table of elements

Materials Today Physics (2018)

Xiaojian Tan Hongxiang Wang Guoqiang Liu Jacques Noudem Haoyang Hu

Periodic Table

Electronic band

10.1016/j.mtphys.2018.10.004