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A New Tubular borate Built by[B_(14)O_(24)(OH)_(6)]^(12-) Cluster Units

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Chemical Research in Chinese Universities 2022年第1期38卷 123-127页

作者： SUN Xiao-Shuang QIN Dan LI Xu-Yan YANG Guo-Yu Key Laboratory of Cluster Science Ministry of EducationSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081P.R.China

Anew mixed alkali and alkaline-earth metal borate Na4Ca2[B14O22(OH)6]·2H2O(1) has been made under a mild solvothermal condition and characterized by single-crystal X-ray diffraction, infrared(IR) spectroscopy, UV-Vis diffuse reflectance spectroscopy, powder X-ray diffraction and thermogravimetric analysis, respectively. Compound 1 features a 1D tube based on[B14O24(OH)6]12-({B14}-1) oxo-boron clusters. Such a tube built by {B14}-1 units has been discovered for the first time in borate system. These tubes are arranged orderly to generate 2D layers and a further 3D supramolecular network through hydrogen bond interactions. UV-Vis diffuse reflectance spectrum reveals that compound 1 is a wide band-gap semiconductor and has potential application in UV region.

关键词： Alkali and alkaline-earth metal borate Tube Solvothermal synthesis Cluster

Tribological study of N-containing borate derivatives and their synergistic antioxidation effects with T531

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Friction 2019年第5期7卷 417-431页

作者： Liping XIONG Zhongyi HE Jian LIU Jianqiang HU Xu XIN Sheng HAN Yinglei WU Shaoming YANG School of Materials Science and Engineering East China Jiaotong UniversityNanchang330013China Department of Aviation Oil and Material Air Force Logistics CollegeXuzhou222100China Shanghai Applied Technology University Shanghai201418China School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghai200240China.

Two N-containing borates, BTES and BMES, were synthesized with dodecyl phenol, 2-(N-containing heterocyclic) ethan-1-ol, boric acid, and dibutylamine, and their tribological properties in rapeseed oil(RSO) were investigated using a four-ball tester. The results showed that the load-carrying ability(P_B value) of RSO can be improved by 40.9% and 67.9%, respectively, when using 0.5 wt% BTES and BMES. Moreover, the antiwear and friction-reducing performances of the additive-containing oils increased with the additive concentration. The X-ray photoelectron spectroscopy results of the worn steel ball surfaces showed that BTES and BMES formed protective films, which contained boron oxide, iron oxide, ferrous sulfate, ferrous sulfide(for BMES), and other organic nitrogen compounds, on the metal surfaces. The better load-carrying and antiwear performances of BMES than those of BTES might be due to their different sulfur contents, which result in different tribochemical reaction films on the contact surfaces. The oxidation stability tests showed that BTES and BMES possessed synergistic antioxidation activity with N-phenyl-α-naphthylamine(T531), and consequently, the oxidation activation energy of the oil sample increased by 77.85% and 82.19%, respectively, compared with that of RSO when the oil sample contained 0.05 wt% BTES/BMES and 0.25% T531.

关键词： N-containing borate synergistic antioxidation effect T531 tribological property

Synthesis and Crystal Structure of a Novel Ternary borate, NaSrB_5O_9

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Chinese Journal of Structural Chemistry 2007年第9期26卷 1081-1086页

作者：陈学安左建龙常新安臧和贵肖卫强 College of Materials Science and Engineering Beijing University of Technology Institute of Microstructure and Property of Advanced Materials Beijing University of Technology

A novel ternary borate, sodium strontium pentaborate, NaSrB5O9, has been prepared by solid-state reaction below 800 ℃. The single-crystal X-ray structural analysis showed that NaSrB5O9 crystallizes in monoclinic, space group P21/c with a = 6.499（2）, b = 13.979（3）, c = 8.045（2）A, β = 106.92（2）°, V = 699.2（3）A^3, Z = 4, Mr = 308.66, Dc = 2.932 g/cm^3, μ = 7.804 mm^-1, F（000） = 584, R = 0.0264 and wR = 0.0621 for 2426 observed reflections and 146 variables. NaSrB5O9 is a layered compound containing double ring B5O11 building units composed of two BO4 tetrahedra and three BO3 triangles. Each B5O11 unit is connected to four other equivalent units through exocyclic oxygen atoms to form a two-dimensional ∞^2 [B5O9]^3- layer. Symmetry-center related layers are stacked along the b axis and held together by Na^＋ and Sr^2＋ cations via electrostatic interactions.

关键词： NaSrB5O9 borate synthesis crystal structure

Crystal Structure of Lithium Yttrium borate LiY_6O_5(BO_3)_3

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Chinese Journal of Structural Chemistry 2006年第10期25卷 1175-1178页

作者： GAO Jian-Hua Beijing Center for Crystal Research and Development Technical Institute of Physics and Chemistry The Chinese Academy of Sciences Beijing 100080 China

Single crystals of LiY6O5（BO3）3 were obtained by the flux method and its structure was determined by a four-circle automatic diffractometer with a MoKα radiation. It crystallizes in monoclinic, space group P21/n with a = 8.330（3）, b = 15.444（4）, c = 8.780（3）°A,β = 91.85（3）°, V = 1129.0（6）°A^3, Z = 4, Mr= 796.83, F（000） = 1456, μ = 30.567 mm^-1, Dc= 4.688 g/cm^3, the final R = 0.0722 and wR = 0.1304. It exhibits a three-dimensional fiamework of yttrium-oxygen polyhedra interconnected by common edges and corners. B and Li atoms are located in the planes and cavities formed by oxygen atoms, respectively.

关键词： borate lithium yttrium borate single-crystal structure VUV luminescent materials

Effect of surfactant on the dielectric and electrorheological properties of zinc borate/silicone oil dispersions

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International Journal of Minerals,Metallurgy and Materials 2019年第12期26卷 1523-1530页

作者： Omer Yunus Gumus Halil Ibrahim Unal Bursa Technical University Engineering and Natural Sciences FacultyFiber and Polymer Engineering DepartmentBursa 16310Turkey Gazi University Science FacultyChemistry DepartmentSmart Materials Research Lab.Ankara 06500Turkey

Zinc borate(ZB)particles dispersed in silicone oil(SO)at concentrations of φ=5vol%-20vol% were subjected to dielectric analysis to elucidate their polarization strength,time,and mechanism.Results revealed that all virgin dispersions lacked polarization.Triton X-100,a non-ionic surfactant,was added to ZB/SO dispersions to enhance the polarizability of ZB particles.The addition of 1vol% Triton X-100 enhanced the polarizability of ZB/SO dispersions,and the 15vol% ZB/SO system provided the highest dielectric difference Δε′(the difference in ε′values at zero and infinite frequency,Δε′=ε0–ε∝)of 3.64.The electrorheological(ER)activities of the ZB/SO/Triton-X dispersion system were determined through the ER response test,and viscoelastic behaviors were investigated via oscillation tests.A recoverable deformation of 36% under an applied electrical field strength of 1.5 kV/mm was detected through creep and creep recovery tests.

关键词： zinc borate electrorheological fluids dielectric analysis surfactant

High temperature DSC study on interfacial reaction of aluminum borate whisker reinforced aluminum alloys

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中国有色金属学会会刊：英文版 1999年第4期9卷 785-790页

作者：毕刚王浩伟吴人洁张荻施忠良上海交通大学金属基复合材料国家重点实验室上海

Aluminum borate (9Al2O32B2O3 ) whisker reinforced ZL109 alloy and pure Al were fabricated by squeeze casting technique. By means of high temperature DSC, the inter facial reaction of these composites was studied in detail, and reaction products were analyzed by using XRD and SEM. It was shown that in the 9Al2O32B2O3,w/Al composites, the pure Al can react with the 9AlO32B2O3 whisker and the critical temperature is 756 ℃. In the composites, the chemical reaction occurs at the interface and the product is identified to be spinel MgAl2O4. The magnesium is one of main factors that cause the interfacial reaction, oxygen promotes the interfacial reaction, but Cu, Ni elements in ZL109 alloy don’t take part in the interfacial reaction. The temperature is another main factors that cause interfacial reaction. When the temperature is higher than 690℃, both Mg and Al elements can react with the whisker. When the temperature ranges from 449℃ to 690 ℃, only Mg element reacts with the whisker. T6 heat treatment causes more serious interfacial reaction.

关键词： composites aluminum borate whisker interfacial reaction

Crystal Structure and Luminescent Properties of a New Rare-earth borate K3Pr3（BO3）4

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Chinese Journal of Structural Chemistry 2019年第5期38卷 727-736,668页

作者：时建朝赵丹薛亚丽张世瑞李飞飞 College of Chemistry and Chemical Engineering Henan Polytechnic University

A new borate K3Pr3(BO3)4 has been prepared using a high temperature flux method and structurally characterized by single-crystal X-ray diffraction analyses.It crystallizes in triclinic system,space group P1 with a=9.0814(10),b=10.8052(12),c=14.0885(16)A,α=69.800(1)°,β=89.922(1)o,γ=89.892(1)°,V=1297.4(3)A^3,Z=4,Mr=775.27,Dc=3.969 g/cm^3,F(000)=1400,μ(Mo Kα)=12.11 mm^-1,R(F2>2σ(F2))=0.028 and wR(F2)=0.054.Interestingly,the crystal of K3Pr3(BO3)4 was twinned by pseudo-merohedry that is mimic monoclinic space group P2/c.The structure of K3Pr3(BO3)4 exhibits a three-dimensional(3D)network based on isolated anionic(BO3)3-units that are further bridged by K+and Pr3+ions.Furthermore,X-ray diffraction(XRD),IRspectrum and photoluminescence(PL)properties were studied.

关键词： borate X-ray diffraction twinning photoluminescence

Synthesis and Crystal Structure of borate Oxide Co_3BO_5

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Chinese Journal of Structural Chemistry 2001年第2期20卷 97-99页

作者：张浩程文旦等 FujianInstituteofResearchontheStructureofMatter ChineseAcaddemyofSciencesStateKeyLaboratoryofStructu

A mix-charge cation solid-state borate oxide Co3BO5 has been synthesized and its structure has been determined by single-crystal X-ray methods. It crystallizes in the orthorhombic space group Pbam with cell parameters a = 9.2963(2), b = 11.948(2), c = 2.9737(6) Å, V = 330.30(12) Å3, Z = 4, Mr = 267.60, F(000) = 504, μ = 14.733, Dcalcd = 5.381g/cm3. The structure was determined from 853 unique reflections and refined to the final residuals R = 0.0633 and ωR = 0.1457. It has two kinds of Co cations, Co2+ and Co3+ . It is composed of highly distorted [CoO4] squares and triangular [BO3] groups that are connected to form infinite two-dimensional layers.

关键词： crystal structure borate cobalt

Long Lasting Phosphorescence in Eu^(2+) and Ce^(3+) Co-Doped Strontium borate Glasses

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Journal of Rare Earths 2006年第Z2期24卷 196-198页

作者：张岚李成宇苏锵 Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied ChemistryChinese Academy of Sciences State Key Laboratory of Optoelectronic Materials and Technologies School of Chemistry and Chemical EngineeringSun Yat-Sen UniversityGuangzhou 510275China

Long lasting phosphorescence (LLP) was observed in Eu2+, Ce3+ co-doped strontium borate glasses prepared under the reducing atmosphere due to the emission of both Eu2+ and Ce3+. The methods of photoluminescence, thermoluminescence and phosphorescence were used to study the samples, and possible mechanism was suggested. The co-doping of Ce3+ ions poisoned the phosphorescence emission of Eu2+ because of the competition to obtain the trapped electron. The phosphorescence of Ce3+ in the sample decays more quickly than that of Eu2+, which is suggested for the reason that the emission energy of Ce3+ is higher or the distance between Ce3+ and electron traps of the glasses is longer.

关键词： long lasting phosphorescence strontium borate glasses Eu2+ Ce3+ rare earths