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'Ionic conductivity' in keywords
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1Author    A. Bensaoud, A. Bouhaouss, M. FerhatRequires cookie*
 Title    Ionic Conductivity of Poorly Crystalline Apatite: Effect of Maturation  
 Abstract    This study deals with the effect of maturation on the ionic conduction of poorly crystalline synthetic apatite. The tendency of this materials to crystallise during maturation is accompanied by an improvement of its ionic conductivity cr. At room temperature, a increased by a factor of 300 after 50 days of maturation. The frequency dependence of the ionic conductivity was attenuated gradually during maturation. These results are explained by the short-range organisation of sites with time, and by the fact that the translational movement of the mobile ions becomes less hindered as the material matures. 
  Reference    Z. Naturforsch. 55a, 883—886 (2000); received May 23 2000 
  Published    2000 
  Keywords    Apatite, Maturation, Ionic Conductivity, Crystallinity 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0883.pdf 
 Identifier    ZNA-2000-55a-0883 
 Volume    55 
2Author    Günter EichingerRequires cookie*
 Title    Zur ionischen Leitfähigkeit gemischter Lithiumiodid-Verbindungen The Ionic Conductivity of Mixed Lithium Iodide Samples  
 Abstract    The ionic conductivity of some polycrystalline samples of the general formula Lil • yXl (y = 1/4 or 1/10) X = Rb+, NH4+, N(CH3)4+, NEt4+) is measured. These mixtures generally exhibit higher activation energies for ionic movement than pure lithium iodide. At temperatures above 50 °C, the overall conductivity is higher them that of pure lithium iodide. 
  Reference    Z. Naturforsch. 33b, 511—515 (1978); eingegangen am 2. März 1978 
  Published    1978 
  Keywords    Lithium Iodide, Alkyl Iodides, Ionic Conductivity 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0511.pdf 
 Identifier    ZNB-1978-33b-0511 
 Volume    33 
3Author    Robert Schöllhorn, Wolfgang SchrammRequires cookie*
 Title    Topotactic Electron/Ion Transfer Reactions of Niobium Chalcogenides Nb3X4 with Tunnel Structure  
 Abstract    Cathodic reduction of Nb3S4 and Nb3Se4 electrodes in electrolytes containing cations of appropriate size results in the formation of ternary phases A^[Nb3X4p-. The cations A n+ are taken up into empty channels of the rigid lattice framework and exhibit high ionic mobility at room temperature. 
  Reference    Z. Naturforsch. 34b, 697—699 (1979); received February 19 1979 
  Published    1979 
  Keywords    Topotactic Reactions, Intercalation Compounds, Niobium Chalcogenides, Ionic Conductivity, Superconductivity 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0697.pdf 
 Identifier    ZNB-1979-34b-0697 
 Volume    34 
4Author    Z.Requires cookie*
 Title    Li2ZnI4, das erste Iodid mit Olivinstruktur  
 Abstract    In the system Lil — Z n L , the hitherto unknow n peritectically melting Li:Z nI4 has been established. It crystallizes in the olivine structure (a = 1480.3(9), b — 856.0(2), and c = 701.2(1) pm) and exhibits high ionic conductivity. Therm oanalytical and R am an spectroscopic data are included. 
  Reference    Z. Naturforsch. 44b, 1047—1049 (1989); eingegangen am 17. März 1989 
  Published    1989 
  Keywords    Lithium Zinc Iodide, Olivine Type, Ionic Conductivity, X -Ray Raman Spectra 
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 TEI-XML for    default:Reihe_B/44/ZNB-1989-44b-1047.pdf 
 Identifier    ZNB-1989-44b-1047 
 Volume    44 
5Author    K. Yamada, K. Isobe, T. Okuda, Y. FurukawaRequires cookie*
 Title    Successive Phase Transitions and High Ionic Conductivity of Trichlorogermanate (II) Salts as Studied by 35C1 NQR and Powder X-Ray Diffraction  
 Abstract    A series o f trichlorogermanate(II) salts (AG eCl3, A = Rb, Cs, C H 3N H 3, and (C H 3)4N) have been synthesized and characterized by 35C1 N Q R , 35C1 N M R , AC conductivity, DTA, and X-ray diffrac­ tion techniques. In the temperature range studied two, two, five, and four phases were confirmed for the Rb, Cs, C H 3N H 3, and (C H 3)4N salts, respectively. From the 35C1 N Q R and structural data, isolated pyramidal G eC l3 anions were recognized in the low temperature phases. With increasing temperature the relaxation times of the 35C1 N Q R decreased exponentially and the signals disap­ peared far below the melting point. This suggests that the reorientation of the anion about the pseudo three-fold axis is excited. With further increase in temperature, the ionic conductivity of C H 3N H 3G eC l3 and (C H 3)4N G eC l3 increased drastically at the phase transitions to their cubic perovskite phases (C H 3N H 3G eC l3: a = 10-1 S m -1 at 400 K, (C H 3)4N G eC l3: a = 5 x 10-2 S m _1 at 420 K). The mobile ion was confirmed to be the chloride ion by means of 35C1 N M R and X-ray diffraction. 
  Reference    Z. Naturforsch. 49a, 258 (1994); received July 23 1993 
  Published    1994 
  Keywords    35C1 N Q R, 35C1 N M R, Ionic conductivity, Rietveld analysis, Phase transition 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0258.pdf 
 Identifier    ZNA-1994-49a-0258 
 Volume    49 
6Author    Tsutomu Okuda, Shusaku Gotou, Toshirou Takahashi, Hiromitsu Terao, Koji YamadaRequires cookie*
 Title    Structure and Successive Phase Transitions of RGeBr 3 (R = Alkylammonium) Studied by Means of NQR  
 Abstract    A series of tribromogermanate(II) complexes RGeBr 3 (R = CH 3 NH 3 , (CH 3) 2 NH 2 , (CH 3) 4 N, C 2 H 5 NH 3 , (C 2 H 5) 4 N) have been synthesized and characterized by 81 Br NQR, AC conductivity, DTA, and X-rax diffraction. These measurements revealed the presence of successive phase transi-tions in these complexes. The crystal structures of Phases I and II in (NH 3) 4 NGeBr 3 were derived from the Rietveld analysis of powder X-ray diffraction. The electric conductivity was considerably high in CH 3 NH 3 GeBr 3 and (NH 3) 4 NGeBr 3 . The conduction mechanism is discussed on the basis of 81 Br NQR spin-lattice relaxation times and crystal structures. 
  Reference    Z. Naturforsch. 51a, 686—692 (1996); received October 10 1995 
  Published    1996 
  Keywords    81 Br NQR, T x, Phase Transition, Ionic Motion, Ionic Conductivity 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0686.pdf 
 Identifier    ZNA-1996-51a-0686 
 Volume    51 
7Author    M. M. Ahmad, M. A. HefniaRequires cookie*
 Title    Effect of Li Content on the DSC and Electrical Conductivity of (Li1_J C Kx)2S 0 4 Mixed Crystals  
 Abstract    Differential scanning calorimetry on (Li1_J(K (.)2S 04 mixed crystals, where x = 0.01, 0.1, 0.3 and 0.5, revealed that, as the potassium content increases, the first high temperature phase of the intermediate LiKS04 phase at T -432 °C grows and shifts to higher temperature, and a double-phase mixture con­ sisting of LiKS04 and Li2S 04 exists for x< 0.5. Ionic conductivity measurements on (Li|_xK;t)2S 04 mixed crystals for x < 0.5 did show that the electrical conductivity increases as the Li2S 04 concentra­ tion increases, with an average activation energy of 0.9 eV. The enhanced electrical conductivity is pri­ marily a result of the increase in the Li+ ion (charge carriers) concentration and/or the formation of a diffuse space charge layer at the interface between the two phases. 
  Reference    Z. Naturforsch. 56a, 677—680 (2001) 
  Published    2001 
  Keywords    (Li)_^KJ()2S 04 Crystals, DSC, Ionic Conductivity, Diffuse Space Charge Layer 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0677.pdf 
 Identifier    ZNA-2001-56a-0677 
 Volume    56