137 resultados para Ni^2
em Chinese Academy of Sciences Institutional Repositories Grid Portal
Resumo:
Ni^2ZnO-Al2O3-SiO2X-Ni^2ZnO-Al2O3-SiO2X-ZnAl2O413nmNi^2^3T2g^3F^3A2g^3F
Resumo:
Ni2+Er3+.
Resumo:
SRBSRBNi^2qm9319mgNi^2gSRBSRBNi^2
Resumo:
Reaction of [Ph(4)P]2WS4 With NiCl2 in methanol solution in the presence of NaOCH3 leads to the formation of [Ph(4)P](2) [S2W(mu-S)(2)Ni(S-2)] (I) A Similar reaction between (NH4)(2)WS4 and NiCl2 under O-2 atmosphere in the presence of Ph(4)PCl or (n)Bu(4)NCl affords [Ph(4)P](2)([(S-2)W(O)(mu-S)(2)]Ni-2] (IIa) and [(n)Bu(4)N](2)([(S-2)W(O)(mu-S)(2)]Ni-2} (IIb) Under argon the same reaction gives [Ph(4)P](2)[Ni(WS4)(2)] (IIIa) and [(n)Bu(4)N](2)[Ni(WS4)(2)] (IIIb). [Ph(4)P](2)[Ni(WOS3)(2)] (IV) and [Ph(4)P](2)[Ni(WO2S2)(2)] (V) can be prepared from the reaction of [Ph(4)P]2WOS3 and [Ph(4)P]2WO2S2 with NiCl2. Treatment of (NH4)(2)WS4 with CuCl in the presence of PPh(3) in boiling pyridine produces W(mu-S)(4)Cu-2(PPh(3))(3) (VI), which can further react with excess PPh(3) to give W(mu-S)(4)Cu-2(PPh(3))(4) . py (VII). Complex I crystallizes in the space group P2(1)/n with the cell parameters: a = 20.049(4), b = 17.010(4), c = 14.311(7) Angstrom; beta = 110.24(3)degrees and Z = 4; R = 0.058 for 4267 independent reflections. The structural study confirms that complex I contains two terminal sulfide ligands, two bridging sulfide ligands, a side-on disulfide ligand, and a planar central W(mu-S)(2)Ni four membered ring. Complex VII crystallizes in the space group C2/c with the cell parameters: a = 26.436(8), b = 20.542(6), c = 19.095(8) Angstrom; beta = 125.00(3)degrees and Z = 4; R = 0.080 for 3802 independent reflections. The structural study reveals a perfect linear arrangement of the three metal atoms Cu-W-Cu.
Resumo:
NiNi2--AFMNiNiNiAFM73 nm
Resumo:
1 2 9Xe30 + (15 0keV)Ni , 2 0 0 10 0 0nmNiNi . : , (nA ) , ,NiNiE2M1 . , ,Ni 6 84 84nm
Resumo:
Li-Ni-La-O.780CH_4:O_2:N_2=2:1:715000h~(-1),C_225.8.XRDIRXPSSEM,LiLa_(1-x)Ni_xO_2,0.1x0.9,LiNiO_2LaNi_(1-y)Li_yO_(4-),x<0.3LiLaO_2,La_2Ni_(1-y)Li_yO_(4-),Li~+-O~--Ni~(2+).LiNiO_2LiLaO_2,La_2Ni_(1-y)Li_yO_4.
Resumo:
,,,170180Wh/kg,Cd-Ni4MH-Ni2T36V36.1991Ceder1998NatureLiAIO_254 VLiAIO_2 A1LiCoO_2 Co
Resumo:
?? ? ? 0CCN~+20 mol20 mol - Eu~(3+)Dy~(3+)(2.O * 1O~(-3)2.0 * l0~(-4)2.0 * 10~(-5)2.0 * 10~(-8) mo1/L)180HH_2O -3Trp-3Trp-158Trp-237Trp-3Trp-158 -Ca~(2+)DNADNADNADNADNADNADNA1Eu~(3+)Dy~(3+)Pr~(3+)Lu~(3+)Ca~(2+)Mg~(2+)DNAP0_2~-2Ni~(2+)Zn~(2+)DNAN7DNAB3Cu~(2+)DNAN7DNADNAB4Ce~(3+)ATDNAATBDNA - 5DNACe~(2+)> Cu~(2+)>Ni~(2+)Zn~(2+)> Eu~(3+)Dy~(3+)Pr~(3+)Lu~(3+)Ca~(2+)Mg~(2+)
Resumo:
1A0.5 dLg2Na2S44-44-Na2S34Ni2-44-4-3-5613C NMR2,3,3',4-2,2',3,3,-:3,4,34'-58.0: 21.0:21.0
Resumo:
Eu~3Sm~3Mn~2Fe~3Co~2Ni~2ZnOcccc10Onm15357-366nmEu3+Sm3Mn2+Fe3Co2Ni2Zn2+O2- Eu3+ZnO363nm368nmEg=3.423.40evEu3Zn1-xEux0.005x0.15Zn1-xTMxO356nm-369nm3.34-3.46eVCo2d-dZn1-xCoxO60Zn1-xEuxO90Zn1-xEuxO613nmEu37F5D378nmZnO394nmEu3+5D07FJJ1234zno378nmEu3+5D07F2znoE4-400KZn0.9Eu0.1OznogCooIO23oK200KM-HBr021emgHc327OeZn0.9Mn0.1OZn0.9Ni0.1OZn0.9Co0.1O80KZn0.9Eu0.1OZT110K14.53Zn1-xTMxOCoFeNiMnZn1-xTMxO80Co2DMSsol-gelZnoTMMCM-41AAOZnO:TMMCM-41MCM-41AAoloonmMCM-41Zn0.9Co0.1O80K-30OKMnFeNiZnoAAOZnO:TM(TM=MnFeCoNiSOK-30OKZnO:AABuSmcoZnlxCoxOPH5ZnORERE=EuSmZn0.98Co0.02O80KZnOREREEuSm80K
Resumo:
///////(m)(e)1.5(e')2.5(e'')/Ni~(2+)Cd~(2+)Co~(2+)Cd~(2+)/
Resumo:
Magnetic nanoparticles of Ni-doped cobalt ferrite [Co1-xNixFe2O4(0 <= x <= 1)] synthesized by coprecipitation route have been studied as a function of doping concentration (x) and particle size. The size of the particles as determined by X-ray diffractometer (XRD) and transmission electron microscope (TEM) analyses was found in the range 12-48 nm. The coercivity (H-C) and saturation magnetization (M-S) showed a decreasing behavior with increasing Ni concentration. M-S of all the samples annealed at 600 degrees C lies in the range 65.8-13.7 emu/gm. Field-cooled (FC) studies of the samples showed horizontal shift (exchange bias) and vertical shift in the magnetization loop. Strong decrease in exchange bias (H-b) and vertical shift (delta M) was found for low Ni concentrations while negligible decrease was found at higher concentrations. The presence of exchange bias in the low Ni-concentration region has been explained with reference to the interface spins interaction between a surface region (with structural and spin disorder) and a ferrimagnetic core region. M(T) graphs of the samples showed a decreasing trend of blocking temperature (T-b) with increasing Ni concentration. The decrease of T-b with increasing Ni concentration has been attributed to the lower anisotropy energy of Ni+2 ions as compared to Co+2 that increases the probability of the jump across the anisotropy barrier which in turn decreases the blocking temperature of the system.
Resumo:
By introducing the flexible 1,1'-(1,4-butanediyl)bis(imidazole) (bbi) ligand into the polyoxovanadate system, five novel polyoxoanion-templated architectures based on [As8V14O42](4-) and [V16O38Cl](6-) building blocks were obtained: [M(bbi)(2)](2)[As8V14O42(H2O)] [M = Co (1), Ni (2), and Zn (3)], [Cu(bbi)](4)[As8V14O42(H2O)] (4), and [Cu(bbi)](6)[V16O38Cl] (5). Compounds 1-3 are isostructural, and they exhibit a binodal (4,6)-connected 2D structure with Schlafli symbol (3(4)center dot 4(2))(3(4)center dot 4(4)center dot 5(4)center dot 6(3))(2), in which the polyoxoanion induces a closed four-membered circuit of M-4(bbi)(4). Compound 4 exhibits an interesting 3D framework constructed from tetradentate [As8V14O42](4-) cluster anions and cationic ladderlike double chains. There exists a bigger M-8(bbi)(6)O-2 circuit in 4. The 3D extended structure of 5 is composed of heptadentate [V16O38Cl](6-) anions and flexural cationic chains; the latter consists of six Cu(bbi) segments arranged alternately. It presents the largest 24-membered circuit of M-24(bbi)(24) so far observed made of bbi molecules and transition-metal cations. Investigation of their structural relations shows the important template role of the polyoxoanions and the synergetic interactions among the polyoxoanions, transition-metal ions, and flexible ligand in the assembly process.
