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1Author    W.-D Griebler, D. BabelRequires cookie*
 Title    Röntgenograpliische und magnetische Untersuchungen an perowskitverwandten Cyanoverbindungen CsM ,I M III (CN)6 X-Ray and Magnetic Studies of Perovskite-Related Cyano Compounds CsM II M TII (CN)6  
 Abstract    The perovskite-related cyano compounds CsMnCr(CN)6 (Mn = Mn, Zn), CsZnFe(CN)6 and CsMnCo(CN)6 (Mn = Mn-Cu) are characterized by their IR active C N and Mm-CN stretching frequencies, their lattice constants and their magnetic suscept ibilities (4,2-295 K). Except for CsCuCo(CN)6, which is tetragonally distorted, all compounds crystallize cubically face-centered (with lattice constants in the range from 1020 to 1084 pm). The magnetic behaviour indicates low spin Mm and high spin Mn states, supporting the IR evidence for a strictly ordered Mm—CN—Mn arrangement. The compound CsMnCr(CN)6 is ferrimagnetic, with a Neel temperature of T>j = 90 K and an extrapolated spontaneous magnetization of a = 2,30 //B at 0 K. Superexchange interactions via the cyano bridges are considered responsible for the ferrimagnetism observed. 
  Reference    Z. Naturforsch. 37b, 832—837 (1982); eingegangen am 5. März 1982 
  Published    1982 
  Keywords    Cyano Perovskites, Lattice Constants, Magnetic Susceptibilities, Ferrimagnetism 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0832.pdf 
 Identifier    ZNB-1982-37b-0832 
 Volume    37 
2Author    Sabine Niemann, Wolfgang JeitschkoRequires cookie*
 Title    The Crystal Structures of Re2Al, Re4Alu, and ReAl6  
 Abstract    of the rhenium aluminides Re4Aln and ReAl6 were obtained by reaction of rhenium with an excess of aluminum. Re4Aln was found to be isotypic with Mn4Alu. The MnAl6 type structure of ReAl6 was confirmed. The crystal structures of both compounds were refined from single-crystal X-ray data. Re4Aln :P l, Z = 1, a = 516.0(1) pm, b = 896.3(2) pm, c = 516.9(1) pm, a = 90.44(1)°, ß = 99.76(1)°, y = 105.17(1)°, V = 0.2271 nm3, R = 0.036 for 2315 structure factors and 74 variable parameters. ReAl6: Cmcm, Z = 4, a -761.0(1) pm, b = 660.5(1) pm, c = 903.4(1) pm, V = 0.4541 nm3, R = 0.013 for 711 F values and 23 variables. In both structures the rhenium atoms have ten aluminum neighbors at distances from 245 to 277 pm. The A l-A l distances cover the whole range from 251 to 362 pm rather continuously. The previously reported compound Re2Al with the tetragonal MoSi2-type struc­ ture has the lattice constants a = 298.1(1) pm, c = 958.4(4) pm, V = 0.08519 nm3. ReAl6 shows Pauli-paramagnetism. 
  Reference    Z. Naturforsch. 48b, 1767—1773 (1993); received June 161993 
  Published    1993 
  Keywords    Crystal Structure, Magnetic Susceptibility, Rhenium, Aluminum Well-crystallized samples 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1767.pdf 
 Identifier    ZNB-1993-48b-1767 
 Volume    48 
3Author    A. Gordon, FrancisJ. DisalvoRequires cookie*
 Title    R obert  
 Abstract    The ternary compound Ce8Pd24Sb is very close in composition to the intermediate valent binary CePd3. A single crystal study yielded a cubic cell with a = 8.461 (1)A, Pm3m symmetry with wR2 = 0.0412 based on 1453 reflections (222 unique) and 16 parameters. This new structure type is composed of distorted perovskite and Cu3Au subcells arranged with the perovskite-like units centred on the corners of the cube. Fitting the magnetic susceptibility data above 100K to a Curie-Weiss expression yielded a Weiss constant of -15(3)K (anti­ ferromagnetic) and an effective high temperature moment per cerium of 2.45(4)/<B indicating trivalent cerium. No ordering was observed above 3K. 
  Reference    (Z. Naturforsch. 51b, 52—5 [1996]; received May 17 1995) 
  Published    1996 
  Keywords    Cerium Intermetallic, Crystal Structure, Magnetic Susceptibility 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0052.pdf 
 Identifier    ZNB-1996-51b-0052 
 Volume    51 
4Author    C. B. Azzoni, M. C. Mozzati, A. Paleari, V. Massarotti, D. Capsoni, M. BiniRequires cookie*
 Title    Magnetic Order in Li-Mn Spinels  
 Abstract    Magnetic measurements were carried out on different samples of Lithium-Manganese spinel LiMn 2 0 4 , great care having been taken to avoid the presence of spurious magnetic phases, such as Mn 3 0 4 . Sus-ceptibility data, showing deviations from paramagnetic behaviour at about 40 K, were analyzed in terms of local magnetic interactions, taking into account the structural and transport properties of these com-pounds. The magnetic response of pure and stoichiometric samples suggests that the onset of a long-range magnetic ordering is hindered by the topological frustration of the antiferromagnetic octahedral sublattice of the spinel. 
  Reference    Z. Naturforsch. 53a, 693—698 (1998); received April 25 1998 
  Published    1998 
  Keywords    Magnetic Susceptibility, Electron Paramagnetic Resonance, Lithium Manganese Oxides, Lithium Manganese Spinel 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0693.pdf 
 Identifier    ZNA-1998-53a-0693 
 Volume    53 
5Author    C. B. Azzoni, M. C. Mozzati, A. Paleari, V. Massarotti, M. Bini, D. CapsoniRequires cookie*
 Title    Evidence of a Cationic Substitution Domain in Lithium-Manganese Spinels  
 Abstract    Magnetic susceptibility measurements and electron paramagnetic resonance spectra of samples prepared from the reactive system Mn0/Li 2 C0 3 with different starting Li cationic fraction x are analyzed, taking into account the structural and compositional information provided by x-ray diffrac-tion. Parent phases, as Mn 2 0 3 , Mn 3 0 4 and Li 2 Mn0 3 , arise together with the lithium-manganese spinel as a result of Li-deficiency or Li-excess with respect to the x = 0.33 composition pertinent to the stoichiometric LiMn 2 0 4 spinel. The data show that the spinel phase can sustain a partial Li-Mn substitution in the cation sites, according to compositional models described, for x > 0.33, by Lii +y Mnit 3y Mnf+ 2y 0 4 (Li-rich spinel) and, for x < 0.33, by Lii_| J/ |Mn^|Mn^| y |Mnfi| I/ |0 4 (Li-poor spinel). Paramagnetic resonance data of the Li-poor spinel phase are analyzed to discuss the possible oxidation state of Mn in the tetrahedral site. 
  Reference    Z. Naturforsch. 53a, 771—778 (1998); received June 22 1998 
  Published    1998 
  Keywords    Stoichiometric LiMn 2 0 4 Spinel Phase, Magnetic Susceptibility, Electron Paramagnetic Resonance 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0771.pdf 
 Identifier    ZNA-1998-53a-0771 
 Volume    53 
6Author    H. S. Sangari, G. S. Sodhi, N. K. Kaushik, R. P. SinghRequires cookie*
 Title    Bis(?? 5 -cyclopentacüenyl)N,N-Disiibstituted Dithiocarbamato(cUoro)oxomolybdeniim(VI) Complexes  
 Abstract    Bis(?j 5 -cyclopentadienyl)N,N-disubstituted Dithiocarbamato(chloro)oxomolybdenum(VI) complexes of the type (C5H5)2MoO(S2CNR2)C1 and (CsHshMoO^CNRR'JCl where R = Me, Et, «'-Pr and R' = cyclohexyl (cyhx) have been prepared by the reaction of stoichio- metric amounts of bis(^5-cyclopentadienyl)oxomolybdenum(VI) dichloride with sodium dichio-thiocarbamates in refluxing dichloromethane. Infrared spectral studies demonstrate that in these complexes, the dithiocarbamate ligands are bidentate. Hence a coordination number of 7 may be assigned to the molybdenum(VI) atom in each case. In addition to infrared studies, electronic spectra, NMR studies, magnetic susceptibility, elemental analyses and conductance measurements have been carried out for these complexes. 
  Reference    Z. Naturforsch. 35b, 1254—1256 (1980); received May 9 1980 
  Published    1980 
  Keywords    Complexes, Electrical Conductance, Magnetic Susceptibility, Electronic Spectra, NMR Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1254.pdf 
 Identifier    ZNB-1980-35b-1254 
 Volume    35 
7Author    H. Holler, W. Kurtz, D. Babel, Sonderforschungsbereich, (. Kristallstruktur, Chemische Bindung, W. KnopRequires cookie*
 Title    Die Kristall-und magnetische Struktur von BaCrF5 Crystal and Magnetic Structure of BaCrF5  
 Abstract    A single crystal X-ray structure analysis of orthorhombic BaCrFs (a — 1393.8(1), b = 571,1(1), c = 494,7(1) pm), which crystallizes in the structure type of BaGaF5, space group P2i2i2i, yielded Cr-F distances in the range of 187.3 to 194.9 pm, average 190.2 pm. Using powder neutron diffraction data taken at 2.2 K a G-type antiferromagnetic structure with spin alignment along the c direction of the lattice was worked out. Single crystal susceptibility data were consistent with this model and in addition showed a small net moment, probably due to spin canting, to be present below the Neel temperature of TN = 3.4 K. The orientation of this moment along the b axis is in accordance with the space group symmetry as well, chemical and magnetic cell being the same. From powder susceptibility data an exchange energy of —3.74 K (g = 2.02) was obtained by fitting Fisher's model. The low bridging angle of Cr-F-Cr = 137.4° within the eis corner-sharing chain of octahedra is made responsible for the weak antiferromagnetism in BaCrFs, which is compared to that of other chromium(III) fluorides. 
  Reference    (Z. Naturforsch. 37b, 54—60 [1982]; eingegangen am 21. August 1981) 
  Published    1982 
  Keywords    Pentafluorochromate(HI), Crystal Structure, Magnetic Structure, Magnetic Susceptibility 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0054.pdf 
 Identifier    ZNB-1982-37b-0054 
 Volume    37 
8Author    Jiří Kohout, Jerzy Mroziński, Mária HvastijováRequires cookie*
 Title    Cy anato -Kupfer (II) -Komplexe mit organischen Liganden, XX [1] ESR-und magnetische Untersuchung des Dicyanato-bis(pyridin)kupfer(II)-Komplexes Cyanato-Copper(II) Complexes with Organic Ligands, XX [1] ESR and Magnetic Study of Dicyanato-bis(pyridine)copper(II)  
 Abstract    The ESR spectra and the temperature dependence of the magnetic susceptibility of Cu(NCO)2(pyridine)2 were measured. The ESR spectrum at room temperature shows a single reversed line; at —130 °C it is isotropic. The susceptibility down to 4.2 K obeys the Curie-Weiss law with a small 6 value. These results are interpreted on the basis of the known crystal and molecular structure. 
  Reference    (Z. Naturforsch. 37b, 102—104 [1982]; eingegangen am 28. September 1981) 
  Published    1982 
  Keywords    ESR Spectra, Magnetic Susceptibility, Exchange Coupling, Magnetic Interaction, Orbital Mixing 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0102.pdf 
 Identifier    ZNB-1982-37b-0102 
 Volume    37 
9Author    V. Massarotti, D. Capsoni, M. Bini, C. B. Azzoni, M. C. Mozzati, A. PaleariRequires cookie*
 Title    Structural and Magnetic Characterization of Mixed Oxides: A Study of Li-Ni-O and Li-Mn-O Systems  
 Abstract    The present paper details the way to determine the cation distribution in mixed oxides with transition ions from the diffraction and magnetic susceptibility data. This approach allows one to determine phase abundances and phase compositions by two combined procedures. By X-ray diffraction Rietveld pro-file refinement and magnetic susceptibility data analysis it is possible to estimate the ratio and the oc-cupancy factor of paramagnetic ions in different oxidation states. A brief discussion of practical cases is reported. In the Li-Ni-0 system the lithium cationic fraction of the ordered phase Li 2r Ni2_2 X 0 2 in-creases monotonically with the total lithium fraction x, for 0.31 < x, < 0.46. In the Li-Mn-0 system for 0.36 < JC, < 0.53 the Li 2 Mn0 3 fraction has been determined, and for the coexistent Li [Li-y Mn 2 _ > ,] 0 4 spi-nel phase the dependence of y on x t has been evaluated. 
  Reference    Z. Naturforsch. 53a, 150—156 (1998); received January 30 1998 
  Published    1998 
  Keywords    X-ray Powder Diffraction, Magnetic Susceptibility, Lithium Nickel Oxides, Lithium Man-ganese Oxides, Lithium Manganese Spinel 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0150.pdf 
 Identifier    ZNA-1998-53a-0150 
 Volume    53 
10Author    G. Knoke, D. Babel, Th HinrichsenRequires cookie*
 Title    Zur Kenntnis von Ammoniumchrom(III)-fluorid NH4CrF4 On Ammonium Chromium (III) Fluoride NH4CrF4  
 Abstract    The hitherto unreported compound NH4CrF4 could be prepared by applying hydro-thermal high pressure techniques. X-ray powder data show NÜ4CrF4 to crystallize tetragonally with a = 743.2, c= 650.4 pm, similar to CsFeF4 and other TIAIF4-related structures. The magnetic behaviour was studied below room temperature and proved NH4CrF4 to become antiferromagnetic (TN = 34 K) within the range known from other A J CrF4 compounds. The thermolysis of NH4CrF4, as investigated by X-rays and TG/DTA, begins at about 400 °C and yields CrF3 and also Cr2F5, if extended to 1000 °C. 
  Reference    Z. Naturforsch. 34b, 934—938 (1979); eingegangen am 28. März 1979 
  Published    1979 
  Keywords    Tetrafluorochromates(III), Powder X-ray Data, Magnetic Susceptibilities, Thermolysis of NH4CrF4 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0934.pdf 
 Identifier    ZNB-1979-34b-0934 
 Volume    34 
11Author    Peter Dierkes, Gerlinde Frenzen, Sigrid Wocadlo, W. Erner Massa, Stefan Berger, Jürgen Pebler, Kurt DehnickeRequires cookie*
 Title    Komplexe des Typs [MCl4(SEt2)2] mit M = Mo und W. Kristallstrukturen, NMR-Spektren und magnetisches Verhalten [MCl4(SE t2)2] Complexes with M = Mo and W. Crystal Structures, NMR Spectra, and Magnetic Behaviour  
 Abstract    The crystal structures of the thioether complexes [MCl4(SEt2)2] with M = Mo and W have been solved by X-ray methods. Both compounds crystallize isotypically in the triclinic space group P I with two formula units per cell unit. The metal atoms are octahedrally coordinated by four chlorine atoms and by the two sulfur atoms of the thioether molecules in trans­ position (symmetry Q) with bond lengths (average): M o -C l 233.1, M o -S 253.4, W -C l 233.1, and W -S 251.7 pm. Both complexes were also characterized by !H and 13C NM R spectro­ scopy as well as by measurement of the magnetic susceptibilities in the tem perature range from 1.8 to 350 K. 
  Reference    Z. Naturforsch. 50b, 159—167 (1995); eingegangen am 23. August 1994 
  Published    1995 
  Keywords    D iethylthioethers of Molybdenum and Tungsten, Crystal Structure, NMR Spectra, Magnetic Susceptibility 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0159.pdf 
 Identifier    ZNB-1995-50b-0159 
 Volume    50 
12Author    Rainer Niewa3, GrigoriV. Vajenine3, FrancisJ. Disalvo, Haihua Luob, WilliamB. YelonbRequires cookie*
 Title    Unusual Bonding in Ternary Nitrides: Preparation, Structure and Properties of Ce2MnN3  
 Abstract    CeiMnNj was prepared by reaction of cerium nitride and manganese with nitrogen gas at 900 °C. It crystallizes isotypic to AC2MN3 (Ac = U, Th; M = Cr, Mn) and Ce^CrN^, space group Immm (No. 71), a = 3.74994(6) A, b = 3.44450(6) A and c = 12.4601(2) A. The manganese atoms are coordinated in a nearly square planar fashion by four nitrogen atoms. These corner-connected MnN* units form infinite J. [MnN2N2/ 2 ] chains, which run parallel to each other along the crystallographic a-axis, forming the motif of hexagonal rod packing. Cerium atoms connect the chains into a three-dimensional network. The results of measurements of the magnetic susceptibility, as well as of the electrical resistivity suggest metallic behavior. Electronic effects leading to shorter bonds between manganese and bridging nitrogen atoms than between manganese and terminal nitrogen atoms in the J. [MnN2N2/ 2 ] chains were investigated through extended Hiickel and LMTO band structure calculations. Issues pertaining to stability of this and some other nitridometallate structures are discussed. 
  Reference    (Z. Naturforsch. 53b, 63—74 [1998]; received September 17 1997) 
  Published    1998 
  Keywords    Ternary Nitride, Crystal Structure, Magnetic Susceptibility, Electrical Resistivity, Extended Hiickel Method 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0063.pdf 
 Identifier    ZNB-1998-53b-0063 
 Volume    53 
13Author    Ramesh Kapoor, Pratibha Kapoor, Ramneek SharmaRequires cookie*
 Title    Reactions of Chromyl Chloride with Carboxylic Acids and Carboxylic Acid Anhydrides  
 Abstract    Chromyl Chloride reacts with carboxylic acids [RCOOH where R — C2H5, AZ-C3H7, CH2CI, CHC1 2 and CCI3] to give reduced chromium(III) carboxylates, [Cr 3 0(00CR) 6 (H 2 0) 3 ]Cl. Magne-tic susceptibility, UV-visible and IR measurements are all consistent with their trinuclear basic structures. Reactions of chromyl chloride with carboxylic acid anhydrides [(RCO) z O where R = CH 3 , C 2 H 5 and «-C 3 H 7 ] give dinuclear oxo-bridged complexes of the type, [Cr 2 0(00CR) 3 ]Cl. These compounds behave as non-electrolytes in polar organic solvents. IR spectra suggest the presence of bridging carboxylato groups containing Cr—O — Cr chains. Their low magnetic mo-ment values suggest polymeric structures exhibiting antiferromagnetic coupling between Cr atoms. 
  Reference    Z. Naturforsch. 40b, 247—250 (1985); received October 17 1984 
  Published    1985 
  Keywords    Chromyl Chloride, Trinuclear Basic Chromium(III) Carboxylate, Dinuclear Oxochromium(III) Carboxylate, Magnetic Susceptibility, IR Spectra, UV-Vis Spectra 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0247.pdf 
 Identifier    ZNB-1985-40b-0247 
 Volume    40