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激光与光电子学进展 2024年第13期61卷 467-472页

作者： Zhang Jingjing Wang Shilei Yang Feng Wang Shanpeng Gao Hongwei Bo Yong Cui Dafu tao xutang Peng Qinjun Key Lab of Solid State Laser Technical Institute of Physics and Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Crystal Materials Shandong University

We report high-energy tunable 6.5-12 μm ps mid-infrared radiation generation based on OPA pumped using 1064 nm laser in LISe *** simulated the relationship between the idler energy and crystal *** optimum LISe length of 4 mm was used to enhance the idler energy *** a pump energy of ～9.4 mJ, energy levels of ～146 and of ～27 μJ are generated at 6.5 μm and 12 μm, *** highest energy of ～205 μJ is achieved at 8.1 μm at a pump energy of ～19 ***, the angular and spectral width acceptance are measured.

关键词： LiInSe2 crystal nonlinear optical crystal optical parametric amplifier tunable mid-infrared radiation

雾化学气相外延法异质外延Ga_(2)O_(3)薄膜的生长特性

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硅酸盐学报 2024年第2期52卷 373-380页

作者：谢佳慧穆文祥李竹程李光清李阳贾志泰陶绪堂山东大学晶体材料国家重点实验室新一代半导体材料研究院晶体材料研究院济南250100 山东省工业技术研究院济南250100

氧化镓各晶相的应用广泛,亚稳相只能通过外延的手段获得。选择合适的生长方法和提高异质外延水平仍是学术界一直探讨的问题。采用雾化学气相沉积(Mist-CVD)法在蓝宝石衬底上异质外延生长了氧化镓薄膜,通过优化工艺条件实现了物相调控,... 详细信息

氧化镓各晶相的应用广泛,亚稳相只能通过外延的手段获得。选择合适的生长方法和提高异质外延水平仍是学术界一直探讨的问题。采用雾化学气相沉积(Mist-CVD)法在蓝宝石衬底上异质外延生长了氧化镓薄膜,通过优化工艺条件实现了物相调控,系统研究了外延膜的结晶质量、组分和表面形貌,以及生长速率变化规律。同时,探究了Mist-CVD生长系统中,Ga_(2)O_(3)外延膜的晶体成核及晶相控制机理。在原有α-Ga_(2)O_(3)生长工艺的基础上,制备了α/ε混相薄膜、ε-Ga_(2)O_(3)纯相薄膜,呈三维岛状生长模式。在ε-Ga_(2)O_(3)纯相薄膜的基础上,随着氧气流量的增加,结晶质量先稳定后下降,生长速率先增加后降低,最高达到3μm/h。通过退火,获得了β-Ga_(2)O_(3)纯相薄膜,表面粗糙度由10.80 nm降低至5.42 nm。在利用Mist-CVD法进行不同晶相外延调控及其生长机理研究方面具有一定借鉴意义。

关键词：氧化镓异质外延雾化学气相沉积法蓝宝石衬底

High quality crystal growth and characterization of ferroelectric Ba_(0.77)Ca_(0.23)TiO_(3) single crystal

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Journal of Advanced Dielectrics 2023年第2期13卷 32-37页

作者： Lei Liu Fangyi Yin Guiyuan Zhao Limei Zheng Xiuwei Fu Zhitai Jia xutang tao State Key Laboratory of Crystal Materials Shandong University JinanShandong 250100P.R.China School of Physics Shandong UniversityJinanShandong 250100P.R.China Shandong Research Institute of Industrial Technology Jinan Shandong 250100P.R.China

Ba_(0.77)Ca_(0.23)TiO_(3)(BCT)single crystal has been widely studied as a promising lead-free ferroelectric *** this work,high-quality BCT crystal was successfully grown by the Czochralski(CZ)*** as-grown crystal is crack-free and shows black *** possesses a high dielectric stability over a wide temperature range,while the dielectric loss is rather small below 90℃.Furthermore,it possesses excellent ferroelectric properties with residual polarization strength(Pr)and coercive field(Ec)of 17.93μC/cm^(2) and 8.47 kV/cm,***,BCT crystal shows large electromechanical coupling factors,with kt,k31,k33 and k15 of 0.535,0.254,0.714 and 0.721,*** piezoelectric coefficients d31,d33 and d15 are measured to be−36.5,130 and 246 pC/N,respectively.

关键词： Lead-free piezoelectric material oxides crystal growth Czochralski method

Bulk gallium oxide single crystal growth

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Journal of Semiconductors 2019年第1期40卷 3-4页

作者： xutang tao State Key Laboratory of Crystal Materials & Key Laboratory of Functional Crystal Materials and Device Shandong University

Gallium oxide, as a new type of ultra-wide bandgap semiconductor, is expected to be used in power electronics and solar blind UV photodetectors. The main cause of research and development onβ-Ga2O3 is inspired by its larger bandgap, higher breakdown field, bigger Baliga figure-of-merit (FOM), shorter absorption edge and lower cost compared to the third-generation semiconductors, such as SiC and GaN.

关键词： Gallium oxide ultra-wide bandgap semiconductor crystal growth

Definition and expression of non-symmetric physical properties in space for uniaxial crystals

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Chinese Physics B 2022年第9期31卷 412-420页

作者：郭晓杰陈丽娟高泽亮尹鑫陶绪堂 State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China School of Physics Science University of JinanJinan 250100China

The anisotropic physical property is the most noteworthy feature of *** this paper,the subscript change method is used to analyze the sign changes of different tensors describing physical properties in uniaxial *** distribution of some physical properties in special point groups exhibits non-symmetry in eight quadrants,which should attract the attention of crystal *** difference between the crystallographic and physical coordinate systems and the lack of crystal symmetry operations are considered to be the origins of the *** avoid ambiguities and difficulties in characterizing and applying crystal physical properties,eight quadrants in space should be ***,we proposed the use of piezoelectric properties to define the positive direction of the optical coordinate axis prior to the research and applications of optical properties.

关键词： uniaxial crystals effective physical constant space distributions the positive direction of optical coordinate axis

Rapid epitaxy of 2-inch and high-quality α-Ga_(2)O_(3) films by mist-CVD method

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Journal of Semiconductors 2023年第6期44卷 52-58页

作者： Xiaojie Wang Wenxiang Mu Jiahui Xie Jinteng Zhang Yang Li Zhitai Jia xutang tao State Key Laboratory of Crystal Materials Institute of novel semiconductorsInstitute of Crystal materialsShandong UniversityJinan 250100China Shenzhen Research Institute of Shandong University Shenzhen 518057China Shandong Research Institute of Industrial Technology Jinan 250101China

High thickness uniformity and large-scale films of α-Ga_(2)O_(3) are crucial factors for the development of power *** this work, a high-quality 2-inch α-Ga_(2)O_(3) epitaxial film on c-plane sapphire substrates was prepared by the mist-CVD *** growth rate and phase control mechanisms were systematically investigated. The growth rate of the α-Ga_(2)O_(3) films was limited by the evaporation of the microdroplets containing gallium acetylacetonate. By adjusting the substrate position(z) from 80 to 50 mm, the growth rate was increased from 307 nm/h to 1.45 μm/h when the growth temperature was fixed at 520 °*** the growth temperature exceeded 560 °C, ε-Ga_(2)O_(3) was observed to form at the edges of 2-inch sapphire *** control was achieved by adjusting the growth temperature. When the growth temperature was 540 °C and the substrate position was 50 mm, the full-width at half maximum(FWHM) of the rocking curves for the(0006) and(10-14) planes were 0.023° and 1.17°. The screw and edge dislocations were 2.3 × 10~6 and 3.9 × 10~(10)cm~(-2), respectively. Furthermore, the bandgaps and optical transmittance of α-Ga_(2)O_(3) films grown under different conditions were characterized utilizing UV-visible and near-IR scanning spectra.

关键词： ultra-wide bandgap semiconductor mist-chemical vapor deposition epitaxy alpha-gallium oxide

A NEW NONLINEAR OPTICAL MATERIAL-ORGANOMETALLIC COMPLEX TRIALLYLTHIOUREA MERCURY CHLORIDE

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Chinese Physics Letters 1990年第7期7卷 334-336页

作者： YUAN Duorong ZHANG Nan tao xutang XU Dong JIANG Minhua Institute of Crystal Materials Shandong UniversityJinan 250100

Tri-allylthiourea mercury chloride(ATMC),an organometallic complex,is a new nonlinear optical material with high second harmonic generation(SHG)*** SHG effect of ATMC is three times as large as that of urea *** single crystal of 15×15×10mm^(3) has been *** studies of crystal growth,structure,and general properties have been carried *** results show that organometallic complexes are promising nonlinear optical materials for wide applications.

关键词： effect crystal nonlinear

Cocrystallization of N-donor type compounds with 5-sulfosalicylic acid:The effect of hydrogen-bonding supramolecular architectures

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Science China Chemistry 2012年第1期55卷 138-144页

作者： WANG Lei XU LingYan XUE RuiFeng LU XiFeng CHEN RuiXin tao xutang State Key Laboratory of Crystal Materials Shandong University Jinan 250100China Key Laboratory of Eco-chemical Engineering Ministry of Education College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042China

Benzotriazole,N,N'-dimethylpiperazine and N-methylpiperazine were applied to crystallize with 5-sulfosalicylic acid(5-H2SSA),affording three new binary molecular cocrystals [(C6H6N3+).(C7H5O6S-)].H2O(1),[(C6H16N22+)1/2.(C7H5O6S-)].H2O(2) and [(C5H14N22+).(C7H5O6S-)2].3H2O(3) under general ***-transferring occurs from acid to nitrogen of N-donor compounds in all compounds 1,2 and *** of the hydrogen-bonding synthons and their effects on crystal packing were also presented in the context of crystal engineering and host-guest *** compound 1,1-D infinite chains are extended to a 2-D layered architecture via strong O-H...O hydrogen bonds and then to a 3-D network by N-H...O *** 2 and 3 both have the 1-D chain which is formed by O-H...O bonds and weak C-H...O hydrogen bonds.A common intramolecular S(6) [synthon I] ring is formed by the hydroxyl with the carboxyl group in all three compounds.

关键词：类化合物超分子结构磺基水杨酸氢键苯并三氮唑共晶 N-甲基哌嗪主客体化学

Facile Synthesis of Multi-Branched Gold Nanostructures through a TBAB-Assisted Route in Aqueous Solution and Their SERS Property

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Chinese Journal of Chemistry 2011年第1期29卷 185-190页

作者： Wang, Luyan Wu, Xinzhou Pei, Meishan Wu, Zhiyan Li, Xiaonan tao, xutang School of Chemistry and Chemical Engineering University ofJinan Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials Jinan Shandong 250022 China State Key Laboratory of Crystal Materials (Shandong University) Jinan Shandong 250100 China

Facile synthesis of multi-branched gold nanostructures by using the tetrabutyl ammonium bromide （TBAB） as a capping agent is described. The reaction is carried out in a one-step process at mild temperature. Gold nanostructures with more than six sharp branches ranging from 70 to 130 nm in length are synthesized in high yield. It is proposed that the relative weak adsorption capacity of TBAB leads to the incompletely covered gold surface and the growth of nanoparticles occurs on the uncovered gold surface, and therefore short branches appear consequently. Then positively charged TBAB layers on the gold surfaces prevent the branches from aggregating with each other which stimulates the branch growth. The prepared branched gold nanoparticles show efficient surface-enhanced Raman scattering （SERS） properties. Low temperature （4 ℃） is unfavorable to the formation of multi-branched gold nanostructures, and only thin small irregular plate-like nanoparticles are produced. The addition of SDS in TBAB aqueous solution results in forming SDS micelles at much lower concentration of SDS （0.4 mmol/L） as compared to that in pure water, and short branched gold nanoparticles are obtained in the SDS-TBAB system.

关键词： gold multi-branched nanostructures tetrabutyl ammonium bromide surface-enhanced Ramanscattering

Hydrogen-bonding directed cocrystallization of flexible piperazine with hydroxybenzoic acid derivatives:Structural diversity and synthon prediction

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Science China Chemistry 2012年第7期55卷 1228-1235页

作者： WANG Lei XUE RuiFeng XU LingYan LU XiFeng CHEN RuiXin tao xutang State Key Laboratory of Crystal Materials Shandong University Jinan 250100China Key Laboratory of Eco-chemical Engineering Ministry of Education College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao 266042China

Four hydroxybenzoic acid building blocks,m-hydroxybenzoic acid,2,4-dihydroxybenzoic acid,2,5-dihydroxyterephthalic acid,and 5-hydroxyisophthalic acid,have been synthesized as robust cocrystallizing agents and employed in reactions with piperazine,including [(C4H12N22+).(C7H5O3)2 ](1),[(C4H12N22+).(C 7H5O4)2 ](2),[(C4H12N22+).(C8H5O62)](3),and [(C4H12N22+)1/2.(C8H5O5)].2H2O(4).Hydrogen-bonded directed assemblies of four salts were validated by single-crystal X-ray diffraction *** compounds 1-4,hydroxybenzoic acids are all deprotonated and piperazine molecules are all protonated to form piperazine dications and keep the chair *** stability of these compounds has been investigated.

关键词：合成子羟基酸共晶结构氢键多样性生物灵二羟基苯甲酸 X-射线衍射分析