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  • Inorganic Chemistry  (4)
  • PACS. 71.45.Lr Charge-density-wave systems - 72.15.Gd Galvanomagnetic and other magnetotransport effects  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Charge-density-wave instabilities and quantum transport in the monophosphate tungsten bronzes with m = 5 alternate structure (2000)
    Springer
    The European physical journal 17 (2000), S. 215-226 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.45.Lr Charge-density-wave systems - 72.15.Gd Galvanomagnetic and other magnetotransport effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Resistivity, thermoelectric power and magnetotransport measurements have been performed on single crystals of the quasi two-dimensional monophosphate tungsten bronzes (PO2)4(WO3)2m for m =5 with alternate structure, between 0.4 K and 500 K, in magnetic fields of up to 36 T. These compounds show one charge density instability (CDW) at 160 K and a possible second one at 30 K. Large positive magnetoresistance in the CDW state is observed. The anisotropic Shubnikov-de Haas and de Haas-van Alphen oscillations detected at low temperatures are attributed to the existence of small electron and hole pockets left by the CDW gap openings. Angular dependent magnetoresistance oscillations (AMRO) have been found at temperatures below 30 K. The results are discussed in terms of a weakly corrugated cylindrical Fermi surface. They are shown to be consistent with a change of the Fermi surface below 30 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510070135
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  • 2
    Electronic Resource
    Electronic Resource
    Electronic instabilities in the quasi-two-dimensional conducting monophosphate tungsten bronzes K P W O ( ) (2000)
    Springer
    The European physical journal 16 (2000), S. 593-600 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.45.Lr Charge-density-wave systems - 72.15.Gd Galvanomagnetic and other magnetotransport effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The monophosphate tungsten bronzes KxP4W8O32 are quasi-two-dimensional conductors. The parent compound P4W8O32 shows two charge density wave instabilities (CDW). The layered structure of the doped compounds contains pseudo hexagonal tunnels stabilised by the insertion of potassium for 0.75〈 x 〈2. In order to study the role of the band filling in the CDW instabilities, we have performed resistivity, magnetoresistance, Hall effect, thermopower and specific heat measurements on the doped compounds with 0.8〈 x 〈1.94. Anomalies at a temperature depending on x appear on all the transport properties. From transport data, we have obtained a phase diagram which shows surprisingly a maximum at 170 K for x =1.3. In the whole range of temperature studied (4.2 K-300 K), the transport properties of KxP4W8O32 show a change for . The diagram is discussed in term of non-monotonous behaviour for the density of states versus the energy and in relation to previous X-ray studies. The transitions in KxP4W8O32 do not seem to be conventional Peierls instabilities in contrast with those observed in pure P4W8O32.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510070177
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  • 3
    Electronic Resource
    Electronic Resource
    Über Azidophenylphosphonium-hexachloroantimonate(V) (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3812-3816 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Azidophenylphosphonium Hexachloroantimonates(V)The azidophenylphosphonium hexachloroantimontes(V) 1-3 were obtained by reaction fo chlorophenylphosphonium hexachloroantimonates(V) with sodium azide. The phosphorus n. m. r. spectra and the vibrational spectra of teh azidophosphonium salts were assigned.
    Notes: Durch Umsetzung von Chlorphenylphosphoium-hexachloroantimonaten(V) mit Natriumazid werden die Azidophenylphosphonium-hexachloroantimonate(V) 1-3 erhalten. Die Phosphorresonanzspektren sowie die Schwingungsspektren der Azidophosphoniumsalze wurden zugeordnet.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731061207
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  • 4
    Electronic Resource
    Electronic Resource
    Über Reaktionsprodukte aus Carbamoylaziden und Antimon(V)-chlorid bzw. Chlorwasserstoff/Antimon(V)-chlorid (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 2877-2882 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction Products of Carbamoyl Azides with Antimony(V) Chloride resp. Hydrogenchloride/Antimony(V) ChlorideCarbamoyl azides react with antimony(V) chloride to form the 1:1-addition compounds. By i.r. spectroscopy could be shown that the Lewis acid is added to the carbonyl group. Hydrogenchloride/antimony(V) chloride leads to oxygen-protonated carbamoyl azides. The i.r. spectra were assigned.
    Notes: Carbamoylazide reagieren mit Antimon(V)-chlorid unter Bildung von 1:1-Addukten. IR-Spektroskopische Untersuchungen zeigen, daß die Lewis-Säure an das Carbonyl-Sauerstoffatom gebunden ist. Mit Chlorwasserstoff/Antimon(V)-chlorid bilden sich die am Sauerstoff protonierten Carbamoylazide. Die IR-Spektren wurden zugeordnet.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060916
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  • 5
    Electronic Resource
    Electronic Resource
    Phosphorazide und deren Schwingungsspektren (1975)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 415 (1975), S. 263-267 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphorus Azides and their Vibrational SpectraThe phosphorus azides P(N3)3 (I), PO(N3)3 (II), and P(N3)5 (III) are prepared by reaction of the corresponding PCl-compounds and sodium azide. III decomposes in solution to I and nitrogen. The vibrational spectra are assigned and discussed. III is covalent and has D3h symmetry.
    Notes: Die Phosphorazide P(N3)3 (I), PO(N3)3 (II), und P(N3)5 (III) lassen sich durch Umsetzung der entsprechenden PCl-Verbindungen und Natriumazid darstellen. III zerfällt in Lösung leicht in I und Stickstoff. Die Schwingungsspektren werden diskutiert. III ist kovalent aufgebaut und besitzt D3h-Symmetrie.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19754150310
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  • 6
    Electronic Resource
    Electronic Resource
    Phosphorylazide und deren Schwingungsspektren (1975)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 418 (1975), S. 72-78 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphoryl Azides and their Vibrational SpectraThe vibrational and 31P-NMR spectra of the following azides OP(OCH3)2N3 I, OP(OCH3)(N3)2 II, OP[N(CH3)2]2N3 III, and OP[N(CH3)2](N3)2 IV, from which II and IV were prepared the first time, were measured and discussed.
    Notes: Die Schwingungs- und 31P-NMR-Spektren der Phosphorylazide OP(OCH3)2N3 I, OP(OCH3)(N3)2 II, OP[N(CH3)2]2N3 III und OP[N(CH3)2](N3)2 IV, von denen II und IV erstmals dargestellt wurden, wurden aufgenommen und diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19754180111
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