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  • 1
    Electronic Resource
    Electronic Resource
    Thermal stability of the amorphous system As-Se-I (1990)
    Springer
    Journal of thermal analysis and calorimetry 36 (1990), S. 2375-2382 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mittels DTA und DDTA wurde untersucht, wie die Zugabe von Jod zu dem binären System As-Se die thermische Stabilität der so gebildeten ternären Gläser beeinflußt. Die untersuchten Gläser entsprechen verschiedenen Regionen des Phasendiagrammes, d.h. sie besitzen einen unterschiedlichen As- bzw. I-Gehalt und enthielten unterschiedlich geartete Struktureinheiten. Bei den untersuchten jodhaltigen ternären Systemen tritt der Kristallisationseffekt bei niedrigeren Temperaturen auf als bei den binären Gläsern As40Se60, das gleiche gilt für die Schmelz- als auch für die Erweichungstemperatur. Sowohl bei den binären als auch bei den ternären Systemen wurde die Aktivierungs energie für den Kristallisationsprozeß ermittelt. Das Glas As40Se60 zeigte eine etwas höhere Aktivierungsenergie, d.h. eine etwas geringere Neigung zur Kristallisation als das ternäre System. Für die kritische Abkühlgeschwindigkeit der Schmelzen zum Erreichen eines minimalen Kristallinitätsgrades wurden bei den binären (As2Se3) und ternären (AsSeI) Systemen annähernd gleiche Werte bestimmt.
    Notes: Abstract The effect of adding iodine to the binary systems As-Se on the thermal stability of the ternary glasses thus formed was investigated by DTA and DDTA. The investigated glasses corresponded to different regions of the phase diagram, i.e. they had different contents of As and I and, consequently, contained different types of structural units. In the investigated ternary systems with iodine, the crystallization effect appears at a lower temperature than in the binary glass As40Se60, and the same holds for the temperatures of softening and melting. For both binary and ternary systems, the activation energies of crystallization were determined. The glass As40Se60 exhibited a somewhat higher activation energy, i.e. a somewhat lower tendency to crystallize than the ternary system. The critical cooling rates of the melts for minimum degree of crystallinity were estimated. The obtained values are approximately equal for the binary (As2Se3) and ternary (AsSeI) systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913635
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  • 2
    Electronic Resource
    Electronic Resource
    Transition metal complexes with thiosemicarbazide-based ligands (1990)
    Springer
    Journal of thermal analysis and calorimetry 36 (1990), S. 2427-2439 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird die thermische Zersetzung und spektroskopische Charakterisierung (Reflexionsvermögen und IR-Spektren) neu synthetisierter Dioxovanadium(V)-Komplexe der allgemeinen Formel NH4[VO2(L)] beschrieben, wobei L das Dianion des dreizahnigen Liganden Salicylaldehyd-thiosemicarbazon (ONS), halogensubstituiertes Salicylaldehyd- bzw. 2-Hydroxy-1-naphthaldehyd-S-methyl-isothiosemicarbazon (ONN) ist.
    Notes: Abstract The thermal decomposition and spectroscopic (reflectance and IR spectra) characterization of the newly synthesized square-pyramidal dioxovanadium(V) complexes of the type NH4[VO2(L)] (L is the dianion of the terdentate ligands salicylaldehyde thiosemicarbazone (ONS), halogen-substituted salicylaldehyde and 2-hydroxy-1-naphthaldehyde S-methylisothiosemicarbazones (ONN)) are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913640
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  • 3
    Electronic Resource
    Electronic Resource
    Electronic spectrum and thermal decomposition of nickel(II) complex with bis(N-γ-pyridyl-4-phenylbenzamide-hydrazone) (1988)
    Springer
    Journal of thermal analysis and calorimetry 34 (1988), S. 1015-1021 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mittels Röntgendiffraktionsmethoden wurden Gitterzellenkonstanten sowie die Raumgruppe der untersuchten Verbindung bestimmt. Durch Analyse der erhaltenen Diffusions-Reflexionsspektren von kristallinem Pulver und des Absorptionsspektrums einer alkoholischen Lösung der Verbindung war es möglich, die Absorptionsbanden des Kristallkomplexes NiL2(ClO4)2·3H2O zu identifizieren und quantitativ zu charakterisieren. Anwendung von Differentialthermoanalyse ermöglicht die Bestimmung des Mechanismus der Zersetzungsreaktion der Verbindung. Durch diese Messungen, einschliesslich der Bestimmung der Anzahl nichtkoordinierter Wassermoleküle, wurde die erwartete Konfiguration des Grundmoleküles überprüft.
    Abstract: Резюме Методом рентгеностр уктурного анализа определены параметр ы крисаллической решетки и пространст венная группа для ком плекса NiL2(ClO4)2·ЗН2О, где L-N-γ-пирид ил-4фенил-бензамидгид разон. L-N-γ-пиридил-4фенил-бенз амидгидразон. Анализ полученного с пектра диффузного от ражения кристаллического по рошкообразного комп лекса, а также спектра его поглощен ия в спирте, представил возможно сть идентифицироват ь и количественно охара ктеризовать полосы поглощения кристалл ического комплекса. П рименения дифференциального т ермического анализа позволило оп ределить механизм те рмического разложения этого ком плекса. Исходя из проведенных измерен ий была подтверждена конфигурация основн ой молекулы, включая определение числа мо лекул некоординиров анной воды.
    Notes: Abstract The unit cell parameters and the space group of the investigated compound were determined by means of X-ray diffraction. Analysis of the diffusion-reflection spectra of the crystalline powder and the absorption spectra of its alcoholic solutions permitted identification and quantitative characterization of the absorption bands of the crystalline complex of NiL2(ClO4)2·3H2O. Application of differential-thermal analysis allowed determination of the mechanism of thermal decomposition of the compound. From these measurements, the expected configuration of the basic molecule was verified, involving determination of the number of non-coordinated water molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913506
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  • 4
    Electronic Resource
    Electronic Resource
    Metal complexes with pyrazole-derived ligands (1996)
    Springer
    Journal of thermal analysis and calorimetry 47 (1996), S. 879-886 
    Details
    ISSN: 1572-8943
    Keywords: complexes ; cobalt(II) ; 3(5)-amino-4-acetyl-5(3)-methilpyrazole ; thermal decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The thermal decomposition of tetrahedral cobalt(II) complexes with 3(5)-amino-4-acetyl5(3)-methylpyrazole (HL) of the general formula [Co(HL)2X2] (X=Cl, Br, I, NCO, NCS) and octahedral [Co(HL)2(H2O)4](NO3)2 and [Co(HL)2−N(CN)2}2] complexes was investigated in air atmosphere in the interval from room temperature to 1000°C. Decomposition of the complexes occurred in several successive endothermic and exothermic processes, and the residue was in all cases CoO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01981822
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Copper on Thermomechanical Characteristics of Amorphous AsSeyIz (2000)
    Springer
    Journal of thermal analysis and calorimetry 59 (2000), S. 877-883 
    Details
    ISSN: 1572-8943
    Keywords: amorphous chalcogenides ; glass transition temperature ; temperature of beginning of deformation ; thermal coefficient of linear expansion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The paper describes results of a study of glasses of the type Cux (AsSe1.4 I0.2 )100–x for x =0, l, 5, 10, 15, 20 and 25 at% Cu, by the methods of thermomechanical analysis. Values of the thermal coefficients of linear expansion in solid and visco-plastic phase were determined and the dependence of this parameter on copper concentration was established. The experimental method used enabled the determination of characteristics glass transition temperature and the temperature of the beginning of deformation, and it was found that these parameters increase with increase in the copper content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010174325329
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  • 6
    Electronic Resource
    Electronic Resource
    Characteristics of optical recording on thin films of quaternary glasses Cu-As-Se-I (1991)
    Springer
    Journal of materials science 26 (1991), S. 5517-5520 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The characteristics of optical recording and changes in the hologram parameters of the amorphous quaternary system Cu-As-Se-I are described. The dependence of the relative contrast of recording on the exposure and transparency properties of the film before and after erasure is the basis for discussion of these processes. Investigation into the dependence of diffraction efficiency of the holograms indicates that these quantities are determined by the thin film composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02403952
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  • 7
    Electronic Resource
    Electronic Resource
    Tendency towards crystallization of Ge-As-Te system glasses (1996)
    Springer
    Journal of materials science 15 (1996), S. 678-679 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264111
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  • 8
    Electronic Resource
    Electronic Resource
    Dispersion of refractive index of the amorphous system Cu x (AS38.5Se54I7.5)100− x (1994)
    Springer
    Journal of materials science 13 (1994), S. 1769-1770 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00776352
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  • 9
    Electronic Resource
    Electronic Resource
    Softening Temperature of the Amorphous Cu-As-Se-I System (1998)
    Springer
    Journal of thermal analysis and calorimetry 52 (1998), S. 553-558 
    Details
    ISSN: 1572-8943
    Keywords: amorphous chalcogenide ; softening temperature ; system Cu-As-Se-I
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A detailed characterization of softening temperatures of a series of samples of the amorphous Cu-As-Se-I system is presented. Previous investigations showed that the most effective mode of erasing optical information stored in this complex quaternary system of chalcogenide amorphous semiconductors (ChAS) is a thermal treatment of the samples at temperatures close to their softening points. On the basis of the results obtained using a range of thermal methods it was possible to determine the interval of the beginning of the softening process of the glass, as well as the coefficient of linear expansion of the samples before and after their softening. Measurements of the temperature dependence of the thin film transparencies enabled the determination of softening temperatures of such types of samples of the investigated system, including the reversibility of the processes determining their transparency properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010119622811
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  • 10
    Electronic Resource
    Electronic Resource
    Thermal stability and electrical conductivity of Ge20As14(Se x S1-x )52I14 glasses (1990)
    Springer
    Journal of materials science 25 (1990), S. 3557-3560 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Investigations of five-component glasses of the Ge20As14(Se x S1-x )52I14 type are reviewed for the temperature interval from room temperature to 1273 K. Thermogravimetric analyses enable the determination of the mechanism of thermal decomposition, as well as the range of amorphous phase existence. Electroconductivity was followed by the method of four points under a direct current regime. Semiconductive character was evaluated, as well as the energies of the corresponding energy gaps. The effect of sulphur (i.e. selen) concentrations on the electrical characteristics was also discussed, along with some of the elements significant for determining the mechanisms of electrical conductivity. Results on optical energy gaps were also redetermined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00575388
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