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  • 1
    Electronic Resource
    Electronic Resource
    Spectroscopic characterization of pure and cation-stabilized sodium phosphate (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 4251-4261 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A systematic study was conducted of pure Na3PO4 and solid solutions of Na3PO4 doped with Mg2+ and Zn2+. Na3PO4 has two solid phases: a low-temperature tetragonal phase and a high-temperature cubic phase. A factor group analysis of the two phases yielded the expected number of modes and their symmetry-based assignments. A temperature-dependent Raman spectroscopic study was then performed for the pure compound. Analysis of the doped Na3PO4 has also provided another description of the local structural distortions present in the cubic structure. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480971
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  • 2
    Electronic Resource
    Electronic Resource
    Structure and vibrational dynamics of sodium sulfate/sodium chromate solid solutions (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 7847-7853 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Solid solutions of Na2SO4/Na2CrO4 are studied using laser Raman spectroscopy, infrared spectroscopy and differential scanning calorimetry. When the chromate ion concentration increases, the lattice expands continuously and a higher temperature sulfate phase, phase III, is stabilized to room temperature. The site group and correlation field splitting are also studied as a function of the relative sulfate(backward-slash)chromate ion concentration. The transition enthalpy from phase III to a higher temperature sulfate phase, phase I, has been measured. The calculated transition entropy is perfectly explained by a mixing entropy model. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471501
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  • 3
    Electronic Resource
    Electronic Resource
    Configuration of the SO=4 ion in the cubic phase of Li2SO4 from band shape studies of the ν3 mode (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 626-630 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A Raman spectroscopic study of the molecular ν3 band in the plastic phase of Li2SO4 is presented. The analysis of the band shape and the depolarization ratio vs frequency suggests a prevalence of C3v configurations around the sulfate tetrahedra. Spectroscopic evidence from the pretransitional region in the monoclinic phase and a similar analysis of the ν3 band in the melt reinforce this hypothesis. These data are compared with structural results and a computer modeling of the possible orientational distribution of the SO2−4 tetrahedra in the plastic phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450609
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  • 4
    Electronic Resource
    Electronic Resource
    Raman scattering spectra of the triple cation salt Li2NaK(SO4)2 (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 720-725 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Single crystals of Li2NaK(SO4)2 were grown at elevated temperatures from an aqueous solution of K2SO4, Na2SO4, and Li2SO4⋅H2O. Polarized Raman spectra were measured at room temperature in various scattering geometries and symmetry-based vibrational mode assignments are made. The existence of an apparent surface phase and a bulk phase is deduced from scattering measurements from different regions of the crystal and is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448495
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  • 5
    Electronic Resource
    Electronic Resource
    The stabilization of phase III and phase I in sodium sulfate by aliovalent cation substitution (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 8929-8935 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Both phase I and III in Na2SO4 have been stabilized at room temperature by substitution with the sulfate salts of the aliovalent cations Y3+, La3+, Dy3+, Ce4+, and Ca2+. Phase stabilization has been studied using laser Raman spectroscopy to measure the internal optic modes of the sulfate anion. Phase III is stabilized by a few tenths of a mole percent of the substituent, while phase I is stabilized by roughly ten times that concentration. Stabilization of both phase I and phase III does not appear to depend significantly on the charge of the guest ion. The enthalpy and entropy of the phase III to phase I transition was found to decrease markedly with increasing substituent cation concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465562
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  • 6
    Electronic Resource
    Electronic Resource
    Coupling interaction between the sulfate ion ν2 modes and the lithium modes in LiKSO4 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 2216-2225 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Resonant couplings between the sulfate ion ν2 mode and the lithium ion translatory mode in E2 and E1 symmetries have been studied in single crystal 7 LiKSO4 and 6 LiKSO4 from polarized Raman spectra between 298 and 519 K and from infrared reflectivity spectra at room temperature. Coupling effects are negligible in 7 LiKSO4 whereas in 6 LiKSO4 the lithium isotope effect shifts the lithium translatory mode into resonant coupling with the sulfate ion ν2 mode. The resonant coupling mechanism between the two fundamental E2 modes is elucidated by a comparative analysis of the temperature dependence of the frequency shifts and the relative intensities. The coupling interaction in E1 symmetry can be only qualitatively described due to poor resolution of the Raman bands. It is possible to distinguish anharmonic processes which couple two modes from anharmonic processes which perturb each state individually. It was found that coupling anharmonicity decreased while perturbative anharmonicity increased with increasing temperature. Detailed consideration of various intensity ratios in E2 symmetry allows the separation of the isotope effect from the coupling contribution to the polarizability derivative tensor. In E1 symmetry TO–TO and LO–LO coupling interactions between the ν2 mode of the sulfate ion and the lithium translatory mode were deduced from the frequency and intensity data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454054
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  • 7
    Electronic Resource
    Electronic Resource
    Orientational disorder in lithium sodium sulfate (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 6941-6945 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Results of Raman, x-ray diffraction, and differential scanning calorimetry studies of lithium sodium sulfate (LiNaSO4) doped with Cd2+ are presented. The x-ray diffraction and differential scanning calorimetry data show that there is no significant change in the room temperature structure over the substitutional range studied. Raman spectra of Cd2+ substituted lithium sodium sulfate are compared with the temperature dependent spectra of pure LiNaSO4 and found to be qualitatively similar, reflecting the increasing breakdown of factor group correlated SO2−4 vibrations with increasing Cd2+ concentration. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469131
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  • 8
    Electronic Resource
    Electronic Resource
    Use of the nonpolar analog model in predicting the effects of solvents on molecular complex formation equilibriums (1973)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 77 (1973), S. 813-819 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100625a016
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  • 9
    Electronic Resource
    Electronic Resource
    Molecular structures and normal vibrations of trifluoromethane sulfonate (CF3SO3-) and its lithium ion pairs and aggregates (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 100-110 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100052a018
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  • 10
    Electronic Resource
    Electronic Resource
    Raman and Infrared Study of the Polymer Electrolytes Formed by Poly(propylene oxide) with Sn(CF3SO3)2 and Pb(CF3SO3)2 (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 12603-12611 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100033a038
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