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  • Europium  (1)
  • Manganese(II) nitrate  (1)
  • elastic-plastic fracture  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Analysis to the stress and strain structures of mode I 3-D crack in elastic-plastic state (1990)
    Springer
    Acta mechanica solida Sinica 3 (1990), S. 263-276 
    Details
    ISSN: 0894-9166
    Keywords: elastic-plastic fracture ; three dimensional stress field ; transition layer ; crack tip opening displacement CTOD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In this paper, the stress and strain structures of Mode I 3-D crack in power hardening material are studied by analyzing the fundamental equations of elastic-plastic mechanics. It is shown that three regions, Z1,Z2 and Z3 can be divided in the thickness direction according to the stress characteristic. In region Z1, the stress components in the plane Perpendicular to z axis (thickness direction) can be solved first using the fundamental equations of plane strain state; in region Z3, they can be solved first by the equations of plane stress state. The region Z2 is defined as a transition layer. It is shown that the transition layer is the characteristic of Mode I 3-D crack in elastic-plastic state, and it is significant to the research on 3-D fracture. The crack tip opening displacement CTOD is chosen to describe the amplitude coefficient of the local stress field, and the distribution of CTOD in 3-D state is investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02206396
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of aquabis(2,2′-bipyridine)nitratomanganese(II) nitrate monohydrate (1995)
    Springer
    Journal of chemical crystallography 25 (1995), S. 605-607 
    Details
    ISSN: 1572-8854
    Keywords: Manganese(II) nitrate ; 2,2′-bipyridine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A new monomeric manganese(II) nitrate complex with 2,2′-bipyridine (bpy), [Mn(bpy)2(NO3)(H2O)](NO3)·H2O, has been prepared and characterized by X-ray crystallography. The complex crystallizes in the triclinic space group $$P\bar 1$$ witha=9.721(3),b=14.691(5),c=8.578(3) Å, α=106.79(3), β=96.05(3), γ=82.55(3)°,V=1159.9 Å3 andZ=2. The structure comprises discrete cation [Mn(bpy)2(NO3)(H2O)]+ in which the metal atom is coordinated by a pair of bidentate bpy ligands [Mn−N=2.261(4)−2.299(4) Å], a unidentate nitrato [Mn−O=2.284(4) Å] and aqua [Mn−O=2.160(3) Å] ligands in a highly distorted octahedral arrangement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01667032
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and crystal structures of quadruply carboxylate-bridged dimeric lanthanide(III) complexes of betaine (1999)
    Springer
    Journal of chemical crystallography 29 (1999), S. 309-316 
    Details
    ISSN: 1572-8854
    Keywords: Europium ; terbium ; betaine ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Three dimeric lanthanide(III) complexes, [Eu2(bet)8(H2O)4](CIO4)6 (1), [Tb2(bet)8(H2O)4](ClO4)6 (2), and [Eu2(bet)4(H2O)8] Cl6·6H2O (3) (bet = Me3N+CH2COO−, trimethyl-aminoacetate), have been prepared and structurally characterized by X-ray crystallography. Complex 1 crystallizes in the monoclinic space group P21/c, with a = 11.7807(8), b = 27.757(5), c = 11.7980(8) Å, β = 99.500(4)°, V = 3805.1(8) Å3, and Z = 2. Complex 2 is isomorphous to complex 1, crystallizing in the monoclinic space group P21/c, with a = 11.7769(14), b = 27.725(3), c = 11.795(5) Å, β = 99.668(14)°, V = 3797(2) Å3, and Z = 2. Complex 3 crystallizes in the orthorhombic space group Pbca, with a = 12.5664(8), b = 17.8645(9), c = 22.2573(8) Å, V = 4996.6(4) Å3 and Z = 4. Both complexes 1 and 2 comprise quadruply carboxylate-O,O′-bridged [M2(bet)4]6+ dimeric cores (M = Eu, Tb), and each metal ion is further coordinated by two terminal aqua ligands and two monodentate bet carboxylates to form a distorted square-antiprismatic coordination geometry. Complex 3 also has a [Eu2(bet)4]6+ core, in which two bet ligands act in the η1:η1:μ2 bridging fashion, and the other two bet ligands in the less common η2:η1:μ2 bridging fashion, namely bridging-chelate mode. Each europium(III) ion in complex 3 is further coordinated by four water molecules to complete a monocapped square antiprism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009573801943
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    Paper (German National Licenses)
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