90 resultados para Sr^2
Resumo:
Crystalline beta-BBO thin films were successfully prepared on (001)-oriented Sr2+-doped alpha-BBO substrates by using liquid phase epitaxy, pulsed laser deposition and vapor transport equilibration techniques. The films were characterized by X-ray diffraction and X-ray rocking curve. The present results manifest that the beta-BBO thin films grown on Sr2+-doped alpha-BBO substrates have larger degree of orientation f value and smaller X-ray rocking curve FWHM than the ones grown on other reported substrates. Compared with other substrates, alpha-BBO has the similar structure, the same UV cutoff and the same chemical properties to beta-BBO. These results reveal that Sr2+-doped alpha-BBO single crystal may be a promising substrate proper to the growth of beta-BBO films.
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Sr^2-BBO001-BBOVTEVTESr^2-BBOc-BBOFWHM1000-BBO-BBO
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A copper-strontium heterometallic coordination polymer was synthesized and characterized by elemental analysis and IR spectra. The crystal structure was determined by single-crystal X-ray diffraction analyses. The title complex is a 2 D coordination polymer with the chemical formula [[(CuL)(2)Sr (H2O) center dot Sr-2 ((HO)-O-2)(7)]center dot 2H(2)O center dot 0.5CH(3)OH](n), where H4L = N-(2-hydroxybenzamido)-N'-(3-carboxylsalicylidene) ethylenediamine. Its structural unit is comprised of two adjacent units, which polymerized with each other to form a new layered heterometallic coordination polymer.
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Eu~(2+):MAl_2O_4(M=Ba~(2+),Sr~(2+)),Eu~(2+)
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With XRD, R-T, and ac chi measurements a comparative study on the doping effects of 3d elements in Bi(1.5)Pb(0.2)Sr(2)Ca(2)Cu(2.8)M(0.2)O(y) (M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, or Zn) has been carried out. The effects of the former five members are significantly different, both on phase formed and on T-c, from the latter four. It seems that the effect on phase stabilization correlates with the valency of the doped cation. In connection with the instability of the 2223 phase, the correlation has been discussed.
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SR , , , 2 m× 5 m; 4 , 4 , 2 m× 2 0 m , , ,
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A capillary electrophoresis method coupled with electrochemiluminescence detection for the analysis of quinolizidine alkaloids was established, especially, oxymatrine (OMT) which could not be measured by previous electrochemiluminescence methods was detected sensitively herein. Complete separation of sophoridine (SR), matrine (MT) and OMT was achieved within 13 min using a background electrolyte of 50mM phosphate buffer at pH 8.4 and a separation voltage of 15 kV. The calibration curves showed a linear range from 2.8 x 10(-8) to 4.4 x 10(-7) M for SR, 2.7 x 10(-8) to 4.4 x 10(-7) M for MT.
Resumo:
(Endoplasmic reticulum , ER ) (Sarcoplasmic reticulum , SR) (2 300 m ) (5 000m 7 000m )24 h , 5 000 m ER Ca2+ , 7 000 m ER Ca2+29102%7 d SR Ca2+ER Ca2+5 000 m 7 000 m 32.50% 33.33%25 d ER , SR Ca2+ .: Ca2+, 7 d , 25 d
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Er^3Judd-OfeltK^Sr^212molK^78310^-21cm^223molSr^275810^-21cm^265nm
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-BBOSr^2-BBO001-BBOXXRDXXRC-BBO001FWHM1000-BBO-BBO190nmQNdYAG-BBO
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Sr^2QBBO001-BBO810300rminBBOCFWHM6766-BBOBBO
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Ca_4RO(BO_3)_3(R:)1PbO, PbF_2B_2O_3Gd_2O_3, CaCO_3, H_3BO_3GdCOB2 Ca_4GdO(BO_3)_3: Eu~(3+),Sm~(3+)Ca_4GdO(BO_3)_3Eu~(3+) 611nmGd~(3+)Gd~(3+)-Gd~(3+)Eu~(3+)Sm~(3+)Eu~(3+)3 M_4LnO(BO_3)_3: Dy~(3+)(M=Ca, Sr, Ba;Ln=La, Gd, Y, Yb, Lu)Dy~(3+)Dy~(3+)Ca~(2+)Sr~(2+)Ba~(2+)La~(3+)Gd~(3+)Yb~(3+)Lu~(3+), Dy~(3+)~4F_(9/2)~6H_(13/2)4 Ca_4YO(BO_3)_3:Tb~(3+), Ce~(3+)Tb~(3+)Ce~(3+)Tb~(3+)Ce~(3+)Tb~(3+)
Resumo:
N_2-H_2M_2~ICO_3 + M_3~(II)(PO_4)_2 + M_2~(III)O_3 + (NH_4)_2HPO_4 + M~(II)F_2 M_x~IM_(10-2x)~(II)M_x~(III)(PO_4)_6F_2 + NH_3 + H_2OM~I = Li~+, Na~+, K~+; M~(II) = Ca~(2+), Sr~(2+); M~(III) = Y~(3+), La~(3+), Gd~(3+); X = 0.5, 1, 2, 3XEu~(3+)M_(10)~(II)(PO_4)_6F_2(Pb_3/m)ac9.416.89 AM~I, M~(II)M~(III)XCe~(3+)Na_2Ca_6La_2(PO_4)_6F_2Ce~(3+)Ce~(3+)-Mn~(2+), Ce~(3+)-Re~(3+) (Re~(3+) = Pr~(3+)Nd~(3+)Sm~(3+)Tb~(3+)Dy~(3+)Tm~(3+)Ho~(3+)Er~(3+))Ce~(3+)-Mn~(2+)-Re~(3+) (Re~(3+) = Dy~(3+), Nd~(3+))Na_2Ca_6La_2(PO_4)_6F_2:Ce~(3+)338358nm~2D-~2F_(5/2)~2D-~2F_(1/2)~2D-~2F_(6/2)~2D-~2F_(7/2)Ce~(3+)F~-Ce~(3+)-Ce~(3+)Ce~(3+)Mn~(2+)Ce~(3+)Re~(3+)A. Ce~(3+)-Sm~(3+)Tb~(3+)Dy~(3+)Tm~(3+)BCe~(3+)-Nd~(3+)Pr~(3+)C. Ce~(3+)-Ho~(3+), Er~(3+)ABCe~(3+)(_T)_A > (_T)_BCe~(3+)-Ho~(3+)Ce~(3+)-Er~(3+)Ho~(3+)Er~(3+)Ce~(3+)Ce~(3+)-Mn~(2+)-Re~(3+)Ce~(3+)Mn~(2+)Re~(3+)Ce~(3+)-Mn~(2+)-Re~(3+)Ce~(3+)-Mn~(2+)Ce~(3+)-Re~(3+)Ce~(3+)-Mn~(2+)-Re~(3+)M. YokataCe~(3+)Ce~(3+)-Mn~(2+)Ce~(3+)-ReCe~(3+)-Mn~(2+))-Re~(3+)Ce~(3+)Ce~(3+)Ce~(3+)(_f, _R)
Resumo:
K_5LnLi_2F_(10):Ce (Ln = La, Ce, Gd, Y)K_2NaAlF_6:CeKAlF_4:CeMAlF_5:Ce(M = Ca, Sr, Ba)ABF_3:Ce (A = Li, Na, K, B = Mg, Ca, Sr, Ba, Zn)SrAlF_5:CeBaAlF_5:Ce3BaAlF_5:CeSrAlF_5:CeXXSrAlF_5I 4bar, z = 814.035 A7.146 ABaAlF_5:CeCe~(3+)Ce~(3+)Ce-FCe~(3+)K_5LnLi_2F_(10)Ce~(3+)Ln~(3+)K_5CeLi_2F_(10)ABF_3:Ce~(1/2) = (zX/)~(1/2)(zX~(1/2)Ce-FCe~(3+)Ce~(3+)Ce~(3+)AMgF_3(A = Na~+,K~+)A~+Mg~(2+)Ce~(3+)SrAlF_5Sr~(2+)BaAlF_5:CeSrAlF_5:CeCe~(3+)5d-4f
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LnAlO_3:Re~(3+)Y-Ba-Cu-OY-Ba-Cu-O1Ba-Y-Cu-OBaYCu2Y-Ba-Cu-O3YBaCuBa0.8-2.3; Y0.4-3Cu2.5-5CuYBa4Y_1Ba_(1.8)Mo_(0.2)Cu_3O_y (M = Sr, Na, K, Cs)MSr~(2+)Ba~(2+)SrTcNa~+K~+, Cs~+Na~+, K~+, Cs~+TcY_1Ba_(1.8)M_(0.2)Cu_3O_y (M = Na~+, K~+, Cs~+)M~+5Y_1Ba~(2-x)K_xCu_3O_yKBaK~+Ba~(2+)K~+BaSrK(0.1-0.5)6Y_1Ba_2Cu_3O_yK3KCuXKCuY_1Ba_2Cu_3O_(7-)LnAlO_3Ce~(3+), Tb~(3+), Dy~(3+)Ce-Tb, Ce-DyBuF_2LnAlO_3 (Ln = La, Gd, Y)LnAlO_3Ce~(3+), Tb~(3+), Dy~(3+)Ce-Tb, Ce-DyLnAlO_3Ln~(3+)LaAlO_3, GdAlO_3, YAlO_3LnAlO_3
