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Bing TENG Weijin KONG Ke FENG Fei YOU Lifeng CAO Degao ZHONG Lun HAO Qing SUN Sander van SMAALEN Wenhui GONG 《材料科学前沿(英文版)》2015,9(2):147
A new organic crystal of 4-N, N-dimethylamino-4′-N′-methyl-stilbazolium benzene sulfonate (DASBS) was synthesized and characterized for the first time. It is a derivative of 4-N, N-dimethylamino-4′-N′-methyl-stilbazolium tosylate (DAST) with the benzene sulfonate replacing p-toluenesulfonate. Single crystal XRD demonstrated that the crystal structure of DASBS·H2O was triclinic. The thermal analysis of this new crystal was also conducted, and the melting point was obtained to be 232°C. 相似文献
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《Zeolites》1995,15(2):104-110
We report on the synthesis and single-crystal structure of a novel cobalt-substituted aluminophosphate. Crystal data: monoclinic, space group (no. 14), a = 8.593(1), b = 15.540(1), c = 7.736(1)Å, β = 110.65(1)°, V = 966.7(4)Å3, Z = 4, R = 0.037, and Rw = 0.029 for 2280 contributing reflections and 182 variables. Refined framework-atom bond distances and angles exhibited regular tetrahedral coordination of Al and P [dave(AlO) = 1.74(1)Å, dave(PO) = 1.54(2)Å] and distorted Co-centered octahedra. The Co substituted every second aluminum in the ordered AlP distribution and was coordinated to five framework oxygen atoms and to one nitrogen atom from a template ethylenediamine molecule located in an eight-member ring opening. Structure collapsed in the absence of template. 相似文献
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Wenwu Zhao Shilie Pan Xiaoyu Dong Junjie Li Xuelin Tian Xiaoyun Fan Zhaohui Chen Fangfang Zhang 《Materials Research Bulletin》2012,47(4):947-951
A new compound, Pb3OBO3F, has been grown by the high temperature solution method from the PbO–PbF2–B2O3 system. It crystallizes in the orthorhombic system, space group Pbcm with unit-cell parameters a = 7.6313(14) Å, b = 6.5229(12) Å, c = 11.906(2) Å, Z = 4, volume = 592.66(19) Å3. The structure of the compound is solved by the direct methods and refined to R1 = 0.0528 and wR2 = 0.1400. Pb3OBO3F consists of Pb(1)O3F tetrahedra, Pb(2)O4 tetrahedra and BO3 triangles which build up the symmetrical chains extended along the c-axis. The powder X-ray diffraction pattern of the Pb3OBO3F has been measured. Functional groups presented in the sample were identified by Fourier transform infrared spectrum. 相似文献
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《Materials Research Bulletin》2006,41(1):54-66
Octadecasil, a clathrate-type inclusion compound, has been synthesized hydrothermally at 453 K with a gel having the composition 1.0SiO2:0.53tetramethylammonium (TMA+):0.54fluoride:86H2O. The crystal structure has been determined based on powder X-ray diffraction data taken at 298 K, and has been refined using Rietveld method. The result confirms the AST-type, all-silica framework model developed by Caullet et al. [P. Caullet, J.L. Guth, J. Hazm, J.M. Lamblin, H. Gies, Eur. J. Solid State Inorg. Chem. 28 (1991) 345]. Furthermore, by using a rigid body model the position and orientation of the occluded TMA+ cation in the rhombododecahedral [46612] cage can be determined; F− anion has been located in the hexahedral [46] cage. The unit cell parameters, in the tetragonal space group I4/m, have been refined as: a = b = 9.07 Å, c = 13.44 Å, cell volume = 1104.97 Å3. The refined unit cell composition is |[N(CH3)4+]2.0F−1.9|[Si20O40], i.e., both TMA+ and F− ions possess near full occupancies, and compensate each other's electronic charges. The crystallization of the AST framework structure is the result of a cooperative structure-directing effect of both ions. 相似文献
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Nobihiro Kumada Yoshinori Yonesaki Takahiro Takei Nobukazu Kinomura Satoshi Wada 《Materials Research Bulletin》2009,44(6):1298-3456
Single crystals of a new tin titanate containing Sn2+, Sn2TiO4 was prepared by high temperature reaction in an evacuated quartz tube and its crystal structure was determined by single crystal X-ray diffraction data. The tin titanate crystallizes in the tetragonal space group P42/mbc with a = 8.490(2) and c = 5.923(3) Å, Z = 4 and the final R factors are R = 0.0497 and Rw = 0.0676 for 354 unique reflections. This tin titanate is isostructural with the low temperature form of Pb3O4(Pb22+Pb4+O4). This compound was oxidized above 600 °C accompanying the mass gain and finally changed to rutile-type solid solution (Sn,Ti)O2. 相似文献
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采用氢化硅烷化反应,合成了侧链含芘丁酸结构单元的聚氧硅烷荧光高分子。用FTIR和^1HNMR表征了它们的分子结构,采用荧光分光光度计测定了它们在溶液中的激发光谱、发射光谱和氧猝灭系数。结果表明,在聚氧硅烷侧链上引入长链烷烃芘衍生物后,由于侧基上芘环的相互作用,在高波长的受激态发射区(Excimer Emssion)具有强的发射峰,而低波长的分子态发射区(Monomer Emission)的强度较弱。聚氧硅烷荧光高分子对氧气敏感,具有较高的氧猝灭系数,在ME区和EE区的氧猝灭系数分别为59%和54%。随着溶液浓度的降低,在ME区的强度增加,氧猝灭系数增大,而在EE区的强度减弱,氧猝灭系数增加不大。 相似文献
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《Materials Letters》2003,57(16-17):2432-2442
Nanoparticles (16- to 25-nm diameter) of PbZr0.7Ti0.3O3, lead zirconate titanate (PZT), are synthesized by a controlled reconstructive thermal decomposition and crystallization from an amorphous polymer precursor with polyvinyl alcohol (PVA) and sucrose at 400 to 700 °C in air. When adding through a mixed acidic solution (with stirring) the ingredients of Pb2+ (nitrate) and Zr4+/Ti4+ (oxyhydroxides) cations mix-up with PVA-sucrose polymer molecules (dissolved in water) and reorganize in a dispersed structure of precursor. A dispersed structure of the cations through the polymer molecules retain on evaporating (at 50 to 80 °C in air) the excess water in a solid polymer precursor. It is found that a single phase compound of PbZr0.7Ti0.3O3 forms on heating it at 400 to 700 °C temperature in air. It has a new tetragonal crystal structure in comparison to the rhombohedral bulk structure in the Zr-rich or the tetragonal structure in the Ti-rich PZTs. The PbZr0.7Ti0.3O3 nanoparticles calcined under selected conditions in this polymorph are characterized by X-ray diffraction and microstructure in correlation with thermal analysis of the polymer precursor. 相似文献
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A photoinitiator HTD bearing in-chain benzophenone (BP) and coinitiator tertiary amine, based on 4-hydroxybenzophenone (HBP), toluene-2,4-diisocyanate (TDI) and N,N-dimethylethanolamine (DMEA), was synthesized and characterized by 1H-NMR and UV-vis absorption spectroscopy. HTD had longer absorption wavelength in the UV-vis absorption spectra than the low molecular counterpart BP. The kinetics of photopolymerization was studied by real-time Fourier transformation infrared (FTIR) spectroscopy. It showed that HTD was a more effective photoinitiator than BP. When this photointiator was used to initiate polymerization of acrylates, both rate of polymerization and final conversion increased with increase of initiator concentration and light intensity. UV-vis extract analysis showed that the extractability of HTD was much lower than BP/DMEA on the same environment condition. 相似文献
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A photoinitiator HTD bearing in-chain benzophenone (BP) and coinitiator tertiary amine, based on 4-hydroxybenzophenone (HBP),
toluene-2,4-diisocyanate (TDI) and N,N-dimethylethanolamine (DMEA), was synthesized and characterized by 1H-NMR and UV-vis absorption spectroscopy. HTD had longer absorption wavelength in the UV-vis absorption spectra than the low
molecular counterpart BP. The kinetics of photopolymerization was studied by real-time Fourier transformation infrared (FTIR)
spectroscopy. It showed that HTD was a more effective photoinitiator than BP. When this photointiator was used to initiate
polymerization of acrylates, both rate of polymerization and final conversion increased with increase of initiator concentration
and light intensity. UV-vis extract analysis showed that the extractability of HTD was much lower than BP/DMEA on the same
environment condition. 相似文献
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N. Kinomura K. Terao S. Kikkawa H. Horiuchi M. Koizumi H. Setoguchi 《Materials Research Bulletin》1983,18(1):53-57
Higher indium phosphide InP3 is obtained under high pressure of 3 GPa at 1200°C. The crystal structure was analyzed to be isomorphous with SnP3, and GeP3 having lattice parameters of and . InP3 is a metallic conductor although it is less in the amount of valence electrons than its isomorphous MP3 of Ge and of Sn. 相似文献
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The structural properties of a new group of ternary silicides in the system M-Ru-Si (M = Y, La, Th and RE) have been investigated. The structure is presented as determined from X-ray powder diffraction. 相似文献
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Min Zhang 《Materials Letters》2010,64(20):2244-2246
C60 covalently connected with dicyanovinyl functionalized tris[4-(2-thienyl)phenyl]amine [C60-TTPA(DCV)] (compound 1) has been successfully prepared and it was found to exhibit excellent solubility in common organic solvents with a broad visible-light harvest. The theoretical calculation of its molecular geometry and electronic structure indicates that the TTPA(DCV) moiety and C60 part are acting as donor and acceptor respectively; By comparing with the UV-visible absorption spectra of amine 2, the slight red shift of compound 1 could explain the existence of a small portion of charge transport between the two parts; and the fluorescence spectra of compound 1 show that the intramolecular photo-induced electron transfer from the TTPA(DCV) to C60 is the main pathway for the emission quenching. 相似文献
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In the system Sb2O31bSbI3, compounds with Sb2O3:SbI3 ratios of 14:2, 11:2 and 8:2, i.e. Sb5O7I, Sb8O11I2 and Sb3O4I have been synthesized. Colorless single crystals of mm dimensions were grown by vapour transport and characterized by chemical, thermal and X-ray analysis. The latter revealed the existence of at least two more phases with higher iodine contents. 相似文献
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Ranadeep Bhowmick Bhaskar Majumdar Dinesh K. Misra Upadrasta Ramamurty K. Chattopadhyay 《Journal of Materials Science》2007,42(22):9359-9365
The effect of large concentration of oxygen on the microstructural development of Zr–Cu–Al–Ni bulk metallic glass (BMG) alloys,
prepared from commercially available Zr sponge, has been studied. Apart from promoting crystallization, increased concentration
of oxygen (∼8000 ppm) spawns additional phases. In particular, we report the appearance of α-Zr, dendritic Zr2Cu phase and the Zr2Ni type cubic phases. Addition of oxygen scavenger like Yttrium only partially solves the problem. Phase evolution was also
found to be sensitive to the cooling rate and hence to the thickness of the cast sample. Thus it is possible to produce a
gradient microstructure with predominantly amorphous phase at the outer layer. 相似文献
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通过750℃,2h煅烧Gd2O3和H2SO4(摩尔比1:1)的前驱体方法合成了Gd2O2SO4粉体.利用Gd2O2SO4的X射线粉末衍射数据和Material Studio 4.0 Reflex模块中Powder solve技术和Rietveld精修方法对Gd2O2SO4的晶体结构进行了研究.研究表明:Gd2O2SO4具有空间群为PMNB(62)的正交晶系,晶胞参数为a=1.2996nm,b=0.8117nm,c=0.4184nm,V=0.440698nm3,Z=4,计算密度为6.6949g/cm3,并确定了晶胞中原子的位置,Rietveld精修得到的Rwp=9.15%. 相似文献