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1978 (361)
201Author    Axel Schmidt, Bernd WrackmeyerRequires cookie*
 Title    Organoborierung von Alkinylstannanen, VIII [1] Zur Reaktion von Alkinyltrimethylstannanen mit 1-Boracyclopentanen und Methylbis(ferf-butyl)boran Organoboration of Alkynylstannan.es, VIII [1] The Reaction of Alkynyltrimethylstannanes with 1-Boracyclopentanes and Methy Ibis (tert -butyl) borane  
 Abstract    Organoboration, l-Boracyclohexylid(2)enes, NMR 1-Organyl-l-boracyclopentanes react with alkynyltrimethylstannanes to give 1-bora-cyclohexylid(2)enes as the only products. The analogous reaction with me thy Ibis (tert-butyl)borane leads to a nonstatistical distribution of organoboration products. Structure and stereochemistry of the new compounds are discussed on the basis of methanolysis reactions and !H, n B and i 3 C NMR data. 
  Reference    Z. Naturforsch. 33b, 855—861 (1978); eingegangen am 24. Mai 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0855.pdf 
 Identifier    ZNB-1978-33b-0855 
 Volume    33 
202Author    Dieter WeberRequires cookie*
 Title    CHsNHsSnBraJa-z = 0-3), a Sn(II)-System with Cubic Perovskite Structure  
 Abstract    CH3NH3SnBr^l3 -.x [x = 0—3) has the cubic perovskite structure with the unit cell parameters a = 5.89 A {x = 3), a = 6.01 A (x = 2) and a = 6.24 A (x = 0) and Z = 1. The compounds show intense colour and conducting property. The U9 Sn Mössbauer data are consistent with the high symmetry environment of the Sn(II)-ion. A bonding model, using a "p-resonance-bonding", can explain the properties of the cubic system. The synthesis is described. 
  Reference    Z. Naturforsch. 33b, 862—865 (1978); eingegangen am 5. Mai 1978 
  Published    1978 
  Keywords    Synthesis, X-ray, Mössbauer Spectra 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0862.pdf 
 Identifier    ZNB-1978-33b-0862 
 Volume    33 
203Author    Johanna Von Unterrichter, Klaus-Jürgen RangeRequires cookie*
 Title    Ag8GeTe6, ein Vertreter der Argyroditfamilie AgsGeTe6, a Representative of the Argyrodite Family  
 Abstract    A single crystal of AgsGeTe6 was found to be rhombohedral, pseudocubic, space group R3m, with a— 817.6 pm, a — 60° and Z — 1. The anion lattice consists of three-dimen-sionally connected Frank-Kasper polyhedra with C. N. 12 and 16. The structure comprises isolated GeTe4-tetrahedra and silver ions, statistically distributed over a number of sites with distorted tetrahedral, trigonal and linear co-ordination. Structural data for some other compounds of the argyrodite family are given. 
  Reference    Z. Naturforsch. 33b, 866—872 (1978); eingegangen am 2. Mai 1978 
  Published    1978 
  Keywords    Silver Germanium Telluride, Crystal Structure, Argyrodite Family 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0866.pdf 
 Identifier    ZNB-1978-33b-0866 
 Volume    33 
204Author    F. Seel, F. SchinnerlingRequires cookie*
 Title    Die Cyanat-induzierte Umwandlung von Calciumhydrogenphosphat in Calciumdiphosphat -eine präbiotische Schlüsselreaktion ? The Conversion of Calcium Hydrogenphosphate into Calcium Diphosphate by Cyanate - a Prebiotic Key Reaction ?  
 Abstract    The conversion of calcium phosphate into calcium diphosphate through cyanate in an aqueous suspension, discovered by Miller and Parris [1], has been reinvestigated thor-oughly. The reaction is initiated through the disproportionation of calcium hydrogen phosphate to give hydroxylapatite and calcium dihydrogen phosphate, which reacts with cyanate via carbamoylphosphate to yield calcium diphosphate and urea. In particular, it could be shown that the process of phosphate condensation may also be initiated when cyanate is generated by a photochemical oxidation of hydrocyanic acid. -The importance of this reaction with respect to the prebiotic synthesis of biopolymers is discussed. 
  Reference    Z. Naturforsch. 33b, 873—876 (1978); eingegangen am 12. Mai 1978 
  Published    1978 
  Keywords    Prebiotic Chemistry, POP-Bond, Calcium Carbamoylphosphate 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0873.pdf 
 Identifier    ZNB-1978-33b-0873 
 Volume    33 
205Author    Werner Buchholz, Hans-Uwe SchusterRequires cookie*
 Title    Die Verbindungen MgFe6Ge6 und LiCo6Ge6 The Compounds MgFeßGee and LiCoöGee  
 Abstract    The hexagonally crystallizing compounds MgFeeGeß and LiCoeGeß were prepared and structurally characterized by single crystal investigations. The lattice constants are a = 506.7 pm, c — 804.5 pm, c/a—1.58s for MgFe6Ge6 and a = 504.8 pm, c = 772.9 pm, c/a = 1.53i for LiCoßGee. The structures (space group P6/mmm) are closely related to the structure of LiFeeGe6 and the B35-type structure of FeGe. 
  Reference    Z. Naturforsch. 33b, 877—880 (1978); eingegangen am 26. Mai 1978 
  Published    1978 
  Keywords    Ternary Germanium Compounds, Magnesium, Iron, Lithium, Cobalt, Crystal Structure 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0877.pdf 
 Identifier    ZNB-1978-33b-0877 
 Volume    33 
206Author    Wolfgang May, Hans Georg Von SchneringRequires cookie*
 Title    Darstellung und Struktur des Bicyclo-[4.4.0]-1.4.6.9-tetraazadecans C6H14N4  
 Abstract    By the weak acid interaction of polymeric phosphanes the condensation of ethylendi-amine yields in a small amount bicyclo-[4,4,0]-l,4,6,9-tetraazadecane C6H14N4. The compound crystallizes triclinic in the space group PI with a = 841.6 pm, b — 463.6 pm, c = 529.2 pm, a= 109.05°, ß= 108.35°, y = 84.13° and Z= 1 formula unit per unit cell. The two condensed six-membered rings have chair conformations. The mean N-C bond lengths are 146.0 pm, the bridging C-C bond is 150.3 pm, whereas the other C-C bonds are 155.1 pm. Structure and condensation reaction are discussed. 
  Reference    Z. Naturforsch. 33b, 881—883 (1978); eingegangen am 17. Mai 1978 
  Published    1978 
  Keywords    Tetraaza-bicyclo-decane, Preparation, Crystal Structure 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0881.pdf 
 Identifier    ZNB-1978-33b-0881 
 Volume    33 
207Author    Hartmut Hibst, Reginald GruehnRequires cookie*
 Title    Beiträge zur Untersuchung anorganischer nichtstöchiometrischer Verbindungen, VII a Ein neuer einfacher Weg zur Berechnung von [(0,F)/Me]-Werten bei Blockstrukturen Contributions to the Study of Inorganic Non-Stoichiometric Compounds, VII a A New Simple Method to Calculate Values of [(0,F)/Me] for Block Structures  
 Abstract    A simple, quick and reliable method is derived to calculate values of [(0,F)/Me] for block structures. The method of calculation is exemplified using ideal and real (defect) block structures and inconsistent published data. The method represents a simple means to systematically classify block structures. 
  Reference    Z. Naturforsch. 33b, 884—890 (1978); eingegangen am 13. Februar/12. Juni 1978 
  Published    1978 
  Keywords    Block Structures, Crystal Structures, Defect Structures, High Resolution Electron Microscopy 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0884.pdf 
 Identifier    ZNB-1978-33b-0884 
 Volume    33 
208Author    Anton Meiler, Walter Maringgele, Klaus-Dieter Kablau, R3b @bullet, R. —n=c 'r, B. R. N=cRequires cookie*
 Title    Umsetzungen von Metall-und Metalloidverbindungen mit mehrfunktionellen Molekülen, XVIII [1] Synthese von Amidinoborazinen Reactions of Metal and Metalloid Compounds with Polyfunctional Molecules, XVIII [1] Synthesis of Amidinoborazines  
 Abstract    The reaction of trimethylsilylamidines with 2-chloro-l,3,4,5,6-pentamethylborazine leads to the corresponding amidinoborazines and chlorotrimethylsilane. 1 H, 11 B, n F NMR spectra, mass spectra and characteristic IR group frequencies are reported. Umsetzungen von Trialkylboranen mit Amidinen ergeben nach Die Si-N-Bindung wird durch Halogenborane meist unter milden Bedingungen nach 
  Reference    Z. Naturforsch. 33b, 891—895 (1978); eingegangen am 5. Mai 1978 
  Published    1978 
  Keywords    Chloroborazines, Silylamidines, Amidinoborazines, NMR 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0891.pdf 
 Identifier    ZNB-1978-33b-0891 
 Volume    33 
209Author    PaulK. Burkert, FrankM. HutterRequires cookie*
 Title    Spektroskopische Untersuchungen in der Festkörperchemie, XII* Re-NQR-und 1 H-Breitlinien-NMR -Studien an Rhenium(YII)- Sauerstoffverbindungen Spectroscopic Investigations in Solid State Chemistry, XII* Re NQR and X H Wideline NMR Studies on Rhenium(VII) Oxygen Compounds  
 Abstract    The first Re NQR spectra of rhenium oxygen compounds with rhenium atoms in the pseudo-octahedral environment of Re207(Ho0)2 and Re207(H20)2 • 2(l,4)-dioxane were found. The values of the Re NQR coupling constants of these rhenium atoms are the highest measured until now. They show, that the gradient of the electrical field is much more sensitive to distortions of an octahedral crystal field than to distortions of a tetrahedral field. 
  Reference    Z. Naturforsch. 33b, 896—898 (1978); eingegangen am 2. Mai 1978 NQR Rheni um 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0896.pdf 
 Identifier    ZNB-1978-33b-0896 
 Volume    33 
210Author    Wolfgang Malisch, Peter Panster, Robert AlsmannRequires cookie*
 Title    Transition Metal Substituted VB Element Systems, 12 [1] Mono-and Dinuclear Transition Metal Complexes with Dihalogenarsenic Groups  
 Abstract    The reaction of ASCI3 with the transition metal anions [r^-CsHstCO^M] 9 (M = Cr, Mo, W) yields the arsenic transition metal complexes -C5H5(CO)3M-AsCl2, which readily form Jrans-77 5 -C5H5(CO)2LM-AsCl2 in the presence of phosphorus donors [L = P(OCH3)3, P(CH3)2C6H5]. Addition of M(CO)s-groups on the trivalent arsenic occurs with THF • M'(CO)s (M' = Cr, Mo) leading to the arsenic bridged dinuclear complexes ^-CsHstCO^Cr-AsC^M^CO^. Controlled Cl/F-exchange at the bridged species can be achieved by use of AgBF4. 
  Reference    Z. Naturforsch. 33b, 899—905 (1978); eingegangen am 21. Juni 1978 
  Published    1978 
  Keywords    Arsenic Transition Metal Complexes, Ligand Exchange, Dinuclear Complexes 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0899.pdf 
 Identifier    ZNB-1978-33b-0899 
 Volume    33 
211Author    M. M. AlyRequires cookie*
 Title    The Isolation and Characterization of Square Planar, Square Pyramidal, and Octahedral Copper(II) Complexes with Mixed Ligands  
 Abstract    Copper(II) Complexes, Mixed Ligands Substitution of an acetylacetonate by a carboxylate in the neutral (acac)2Cu(II) was achieved by its reaction with tri-and dichloroacetic acid in benzene (HCO2R where R = CCI3 or CHCI2; Hacac = acetylacetone) which led to the formation of the mixed chelate square planar complex (acac)Cu(OCOR). The later complex, R = CCI3, reacted with heterocyclic bases to produce the square pyramidal complexes (acac)Cu(OCOR) (base), (base = 2-methylpyridine or quinoline); with ethylenediamine (en) to give the octahedral [(en)2Cu(OCOR)]Cl, and with methanol and piperidine or boiling methanol alone to give the methoxo-bridged (acac)Cu(OCH3)2Cu(acac). The reaction of acetylacetonate-carboxy-late-copper(II) complex (R = CHCI2) with heterocyclic bases led to the cleavage of the acetylacetonate ligand and the formation of the octahedral Cu(OCOCHCl2) • 2 base (base = pyridine, 2-, 3-or 4-methylpyridine). The same cleavage reaction took place, and also with R = CCI3, in their reaction with 8-hydroxyquinoline to form the mixed chelates (ROCO)Cu(Oxinate). These formulations are based on chemical analyses, electronic and vibrational spectra, and on conductance measurements. 
  Reference    Z. Naturforsch. 33b, 906—910 (1978); received March 22/April 27 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0906.pdf 
 Identifier    ZNB-1978-33b-0906 
 Volume    33 
212Author    WolfgangA. Herrmann, Ilona SchweizerRequires cookie*
 Title    Komplexchemie reaktiver organischer Verbindungen, XXV [1] Stabilisierung von Diphenylmethylen und Diphenyldiazomethan in Carbonylcobalt-Komplexen Complex Chemistry of Reactive Organic Compounds, XXV [1] Stabilization of Diphenylmethylene and Diphenyldiazomethane in Carbonyl Cobalt Complexes  
 Abstract    Low temperature photolysis of (r/ 5 -C5H5)Co(CO)2 with diphenyldiazomethane in te-trahy drofurane yields [i -carbonyl -fi-diphenylmethylene -bis (r) 5 -cy clopentadienylcobalt) (Co-Co) and 
  Reference    Z. Naturforsch. 33b, 911—914 (1978); eingegangen am 5. Mai 1978 
  Published    1978 
  Keywords    H-Diphenylmethylene, /^-Diphenylmethylenehydrazido, Cobalt 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0911.pdf 
 Identifier    ZNB-1978-33b-0911 
 Volume    33 
213Author    H. Parlar, S. Nitz, A. Michna, F. KörteRequires cookie*
 Title    Ein Beitrag zur Zusammensetzung des Insektizides "Toxaphen®" Gaschromatographisch-massenspektroskopische Charakterisierung eines öligen und eines kristallinen Anteils des technischen Toxaphens und dessen insektizide Wirksamkeit A Contribution to the Composition of the Insecticide "Toxaphene®" Gaschromatographic-Masspectroscopical Characterisation of the Oily and the Crystalline Fraction of Technical Toxaphene and their Insecticidal Activity  
 Abstract    Technical Toxaphene can be separated in two fractions by recrystallisation which are investigated with the help of GC/MS and toxicological methods. Especially the Retro-Diels-Alder-fragmentations give specific informations on the structure of highly chlorinated bornane derivatives representing the main components of the technical mixture. For this study lower chlorinated bornanes are used as model substances. Toxicological investigations show that both fractions have lower activity than technical toxaphene. 
  Reference    Z. Naturforsch. 33b, 915—923 (1978); eingegangen am 10. Mai 1978 
  Published    1978 
  Keywords    Toxaphene, Chlorinated Bornane, Mass Spectrometry, Toxicology 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0915.pdf 
 Identifier    ZNB-1978-33b-0915 
 Volume    33 
214Author    Heinz Falk, Karl Grubmayr, Klaus ThirringRequires cookie*
 Title    Beiträge zur Chemie der Pyrrolpigmente, XXIII [1] Die Struktur eines Bilatrien-abc-Derivates im gelösten Zustande On the Chemistry of Pyrrole Pigments, XXIII [1] The Structure of a Bilatriene-abc Derivative in the State of Solution  
 Abstract    The (Z,Z,Z)-configuration of the mono-lactim-ether of an alkyl substituted bilatriene-abc, Etiobiliverdin-IV-y, was established for chloroform solutions. Moreover the confor-mation of this molecule is a helical one (syn-syn-syn) with a twist along the single bonds at the methine groups of approximately 20°. The two tautomeric lactam-forms with a proton on one or the other nitrogen atom of the pyrromethene subsystem are indistin-guishable by the methods used in this investigation: *H NMR pattern, Lanthanide induced shift technique and Nuclear Overhauser Effect measurements. 
  Reference    Z. Naturforsch. 33b, 924—931 (1978); eingegangen am 30. Januar 1978 
  Published    1978 
  Keywords    *H NMR, Lanthanide Shifts, Configuration, Conformation, Tautomeric Equilibrium 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0924.pdf 
 Identifier    ZNB-1978-33b-0924 
 Volume    33 
215Author    Wolfgang RungeRequires cookie*
 Title    The Molecular Structure of Allenes and Ketenes, XII [1] Four-Bond Proton-Proton Spin-Spin Couplings in Allenes  
 Abstract    Four-bond proton-proton coupling constants in allenes are reported. The substituent effects on the coupling constants are discussed on the basis of the dual-substituent parameter approach. Furthermore, the coupling constants are related to quantum-chemical indices (electron densities, overlap populations) obtained from semiempirical CNDO/S and ab initio STO-3G calculations. The magnitudes of the coupling constants depend upon the polar natures of the substituents as well as upon their charge-transfer abilities (resonance effects) to a com-parable amount. In general, the coupling constants in 1,3-disubstituted allenes are nonadditive in ligand -specific parameters. 
  Reference    Z. Naturforsch. 33b, 932—936 (1978); eingegangen am 18. Mai 1978 
  Published    1978 
  Keywords    Allenes, Proton-Proton Coupling Constants, Substituent Effects 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0932.pdf 
 Identifier    ZNB-1978-33b-0932 
 Volume    33 
216Author    A.F A Shalaby, H. A. Daboun, M.A Abdel AzizRequires cookie*
 Title    Novel Rearrangement of 5-Arylazo-2-thiohydantoin Derivatives with Alkali and Aromatic Amines  
 Abstract    2-Thiohydantoin Derivatives, Alkali Amines, Aromatic Amines 5-Arylazo-2-thiohydantoin derivatives (2a,c) were cleaved and rearranged by aqueous sodium hydroxide to give the corresponding l-aryl-Zl 2 -l,2,4-trazole-5-imino-3-carboxylic acids (3a-c). 3 a was decarboxylated to 1-phenyl-Zl 2 -1,2,4-triazoline-5-imine (o). Hydrolysis of 5-arylazo-l-phenyl-2-thiohydantoins (6a-c) behaved in different manner affording l-aryl-4-phenyl-zl 2 -l,2,4-triazoline-5-thione-3-carboxylic acids (7a-c). Fusing (2a-c) with aromatic amines at high temperature gave the corresponding anilides (8a-h). Treatment of 5-arylidene-2-thiohydantoin derivatives (9a-c) with hydrazine hydrate gave colourless products of thioureido cinnamic acid hydrazide derivatives (lOa-c), while refluxing ö-arylidene-2-methylmercaptohydantoin (lla-d) with hydrazine hydrate and/or benzo-phenone hydrazone gave the corresponding glycocyamidine derivatives (12a-g). 
  Reference    Z. Naturforsch. 33b, 937—941 (1978); received March 16 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0937.pdf 
 Identifier    ZNB-1978-33b-0937 
 Volume    33 
217Author    Heinz-Peter Schuchmann, Peter Naderwitz, Clemens Von SonntagRequires cookie*
 Title    Photolysis (A 185 nm) of Liquid Tetrahydropyran  
 Abstract    The main products of the 185 nm photolysis of neat liquid tetrahydropyran are pent-4-en-l-ol (7) (0 = 0.40), 2-(5'-hydroxypentyl)tetrahydropyran (10) (0.21), valeraldehyde (6) (0.13), and pentan-l-ol (8) (0.08). These products are thought to be formed via the bi-radical '0(0112)40112, and/or through intramolecular (6, 7, 8) and intermolecular (10) photoreactions. In the case of 10, the probability of a specific intermolecular photoreaction involving two tetrahydropyran molecules is suggested by the fact that in the photolysis of solutions of tetrahydropyran in cyclohexane and formaldehyde dimethyl acetal products analogous to 10 made up of a tetrahydropyran and a solvent molecule moiety, are not formed. 
  Reference    Z. Naturforsch. 33b, 942—945 (1978); received April 28 1978 
  Published    1978 
  Keywords    Photolysis, Tetrahydropyran, Quantum Yields, Biradical Intermediates, Photodimer 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0942.pdf 
 Identifier    ZNB-1978-33b-0942 
 Volume    33 
218Author    V. M. Chari, R. Klapfenberger, H. WagnerRequires cookie*
 Title    Synthesis of Xanthone-O-glycosides, I Synthesis of 3-0-/3-Glycosides  
 Abstract    Xanthone-O-glycosides, Gentioside, Synthesis The synthesis of hydroxy-xanthone-3-0-/?-glycosides by condensation of the appropriate aglycone and the acetyl-a-D-glycosyl bromide in pyridine solution in presence of silver carbonate is described. The naturally occurring l-hydroxy-3-0-/?-primeverosyl-7-methoxy xanthone (gentioside) has been synthesized and its structure thereby confirmed. 
  Reference    Z. Naturforsch. 33b, 946—949 (1978); received April 17 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0946.pdf 
 Identifier    ZNB-1978-33b-0946 
 Volume    33 
219Author    Schwefeldiimiden, Uwe KlingebielRequires cookie*
 Title    Ein neues Darstellungsverfahren von Carbo- A New Method for the Preparation of Carbo-and Sulfurdiimides  
  Reference    Z. Naturforsch. 33b, 950—951 (1978); eingegangen am 29. Mai 1978 
  Published    1978 
  Keywords    Lithio-aminofluorosilanes, Trimethylsilyliso-cyanate, Trimethylsilylthioylimide, Carbodiimides, Sulfurdiimides 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0950_n.pdf 
 Identifier    ZNB-1978-33b-0950_n 
 Volume    33 
220Author    Strontiumchromate, K. Hartl, R. BraungartRequires cookie*
 Title    eine Hochtemperaturphase mit Defekt-Bariumphosphat-Struktur a High- Temperature Compound with Defect-Bariumphosphate Structure  
 Abstract    Black hexagonal platelets growing on stron-tiumoxide in the presence of chromium (III)-oxide and air at temperatures from 1250 to 1400 °C have been shown to belong to the rhombohedral space group R3m. In hexagonal orientation the elementary cell has the axes ao = 1115.8 i 0.9 pm and c0 = 4037 ± 3,6 pm and Z = 24, Dx — 4.26. Structurally the compound is closely related to Ba3(P04)2, with the excep-tion, that there are defects in the metal sub-lattice. At temperatures below 1200 °C Stron-tiumchromate(V, VI) decomposes into the dis-crete chromates(V) and -(VI). At temperatures from 113 to 338 K the compound is an electronic semiconductor with an activation energy of 0.26 eV. 
  Reference    Z. Naturforsch. 33b, 952—953 (1978); eingegangen am 1. Juni 1978 
  Published    1978 
  Keywords    High-Temperature Oxochromate, Defect Structure, Mixed-Valence Oxochromate, Semiconductor 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0952_n.pdf 
 Identifier    ZNB-1978-33b-0952_n 
 Volume    33 
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