ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 109 (1987), S. 3251-3257 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 2435-2440 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have investigated the phase diagrams of the alkali cyanides NaCN, KCN, RbCn, and CsCN in the pressure range up to 27 GPa, using the Raman and energy-dispersive x-ray techniques. We completed the information concerning the concept of a general phase diagram of the alkali cyanides with our measurements. In the case of KCN and RbCN we found at room temperature the expected high pressure phase. This phase IV, with a monoclinic structure (space group Cm) can be followed up to about 27 GPa. A different behavior was observed for NaCN. This crystal has in the pressure range between 10–15 GPa a coexistence region between the antiferro-ordered orthorhombic phase B and the ferro-ordered monoclinic phase. However, this monoclinic phase IVa in NaCN has a different structure with space group Pm (C1s). Finally the combination of the x-ray and Raman data allowed the determination of the structure of CsCN at low temperature and at high pressures. The structure is rhombohedral with space group R3m (phase VII).
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 1982-1984 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 91 (1987), S. 219-224 
    ISSN: 1436-5073
    Keywords: decoration technique ; defect analysis ; precipitation ; microcracks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A decoration technique for the visualization of microcracks based on chemical impregnation and transmitted light optical investigation is described.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 31 (1986), S. 589-595 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die thermische Zersetzung von CuInSe2, LiInSe2 und LiInTe2 wurde mit TG/DTG - MS - - Kopplung bei hohen Temperaturen im Vakuum untersucht. Für CuInSe2 wurden zwei deutlich getrennte Stufen registriert. Bis 1000° verdampft Se und In2Se, später Cu2Se. Die Li-Verbindungen zeigen ähnliches Verhalten, jedoch wurde Li+ auch während der ersten Stufe nachgewiesen. Offenbar dissoziiert Li2Se eher als Cu2Se. Bis zur vollständigen Verdampfung von CuInSe2 erscheinen keine Cu+-Spezies in der Gasphase.
    Abstract: Резюме Используя ТГ/ДТГ, сопр яженные с масс-спектрометрией, изучено термическое разложение CuInSe2, LiInSe2 и LiInTe2 в в акууме при высоких температурах. Первое соединение разлагается в две ста дии: до температуры 1000° испаряется Se2 и In2Se, а зате м Си и Se. Литий содержащие соединен ия показали подобное поведение. Однако, уже на первой с тадии разложения был обнар ужен литий ион. Вероят но это обусловлено тем, что с еленид лития диссоциирует более л егко, чем селенид меди. Даже при полном разложении CuInSe2 н е было найдено ионов меди в п родуктах распада.
    Notes: Abstract The thermal decompositions of CuInSe2, LiInSe2 and LiInTe2 in vacuum at high temperatures were studied by using TG/DTG coupled with mass spectrometry. For CuInSe2, two steps were found to be significant. Up to 1000 °C Se2 and In2Se evaporate, followed later by Cu2Se. The Li-containing compounds show similar behaviour. However, Li+ was already detected during the first step. Obviously, Li2Se dissociates more readily than Cu2Se. No Cu+ species were detected up to the complete evaporation of CuInSe2.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 24 (1989), S. 2483-2487 
    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 crystal structure of a Cu-richβ-phase in the system Cu-In-Se with the composition Cu14.0In16.7Se32 quenched from 750° C, has been determined with single crystals. The investigated single crystal of this Cu-richβ-phase has the composition Cu14In16.7Se32 and crystallizes witha = 1.1534(4) nm in the space groupP−43m. The cations are statistically distributed together with vacancies, but show strong preferences for distinct positions. The number of vacancies is estimated from the crystal structure analyses and is found to be much less than in the Cu-poorβ-phase. The crystal structure is compared with that of an ordered Cu-richβ-phase.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 35 (1989), S. 2509-2527 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die spezifischen Wärmen derCluster-Verbindungen [Ag6M4P12]Ge6 (M=Ge, Sn) wurden im Temperaturbereich 2 K bis 300 K bestimmt. Die thermische Zersetzung in die Elemente wurde unter Knudsen-Bedingungen auf einer mit einem Massenspektrometer gekoppelten Thermowaage untersucht. Die Standardentropie, -enthalpie und die Debye-Temperaturen wurden berechnet. Die aus den Knudseneffusionsdaten abgeleiteten Dampfdruckfunktionen dienten zur Berechnung der Bildungswärmen. Die komplizierte Temperaturabhängigkeit der spezifischen Wärme wird für strukturelle Details und unterschiedliche Beiträge qualitativ diskutiert: fürT⩽K ein elektronischer Anteil, in der Ge-Verbindung im Bereich 2 K⩽T⩽20 K eine dreifache Schottky-Anomalie (ΔE0/k=46(2) K) sowie Gitterschwingungen, die durch unterschiedliche Abständed(Ag-Ag) und Massen (Ge und Sn) beeinflusst werden.
    Abstract: Резюме В интервале температ ур 2–310 К были измерены теплоемкости класте рных соединений [Ag6M4P12]Ge6, где M=Ge, Sn. Термическое разложение их на отде льные элементы было проведено в усло виях Кнудсена с помощ ью термовесов, соединен ных с массспектромет ром. Из данных теплоемкос тей были вычислены та кие термодинамические ф ункции, как стандартная энтр опия, энтальпия и темп ературы Дебая. Функции давлен ия паров, выведенные из эффузи онных данных Кнудсен а, служили для вычисления треть его закона теплообразования. Сл ожная температурная зависимость удельной теплоемкос ти количественно обсуждена с учетом ст руктурных деталей и р азличных вкладов: электронный член (Т⩽З К), трехосная аномалия Ш оттки (ΔEo/k=46(2) К) в соединен и германия (2 К⩽T⩽20 К), решеточные вклады, за трагиваемые расстоя ниями Ag-Ag и атомными массами (Ое и Sn) в обоих соединениях.
    Notes: Abstract The heat capacities of thecluster compounds [Ag6M4P12]Ge6 (M=Ge, Sn) have been measured in the temperature range from 2 K to 310 K. Thermal decomposition into the elements was carried out under Knudsen conditions on a thermobalance combined with a mass spectrometer. The thermodynamic functions standard entropy, enthalpy, and the Debye temperatures were calculated from the heat capacity data. The vapour pressure functions derived from the Knudsen effusion data, served to calculate the third law heat of formation. The rather complicated temperature dependence of the specific heat is qualitatively discussed by considering structural details and different contributions: electronic term (T≲/3 K), a threefold Schottky anomaly (ΔE 0/k=46(2) K)in the Ge-compounds (2 K⩽T⩽20 K), lattice contributions influenced by the distances Ag-Ag and atomic masses (Ge and Sn) in both compounds.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 5 (1986), S. 1195-1197 
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 325 (1986), S. 607-610 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Möglichkeit der quantitativen Bestimmung von Iod als Routinemessung mittels AES-ICP wird vorgestellt. Die empfindlichsten Iodemissionslinien werden bezüglich Nachweisgrenzen, Untergrundäquivalenzwerten sowie chemischen und spektralen Interferenzen unter Standardbedingungen getestet. Geeignete Methoden zur Herstellung stabilier Eichlösungen und zur Präparation von Probenlösungen aus iodhaltigen organischen und anorganischen Substanzen werden erläutert, sowie Ergebnisse von Testanalysen mitgeteilt.
    Notes: Summary The possibility of quantitative determination of iodine as a conventional measurement by AES-ICP is introduced. The most sensitive iodine emission lines are investigated, referring to detection limit, background equivalation concentration, as well as the chemical and spectral interferences for standard conditions. Appropriate methods for the preparation of stable calibration solutions, and the preparation of sample solutions of iodic organic and inorganic samples are discussed, as well as the results of the test analyses.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    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 To investigate how the local symmetry of the Sm3+ ion affects the fluorescence of a samarium metaphosphate glass of composition (Sm2O3)0.248(P2O5)0.752, the temperature and pressure dependences of its laser induced fluorescence spectrum are compared with those of a samarium pentaphosphate crystal (SmP5O14). Findings include: (i) The crystal field splitting of the energy levels responsible for fluorescence in SmP5O14 at room temperature is consistent with the local symmetry of oxygen atoms of the phosphate cage around the Sm3+ ions being quite close to cubic – in accord with crystal structure. At 12 K there is a systematic disappearance of the shortest wavelength lines of each fluorescence band attributable to a decreasing population of higher crystal field levels, which are occupied at ambient temperature. (ii) The (Sm2O3)0.248(P2O5)0.7520.248 glass fluorescence spectrum forms five bands, which can be related to that of the crystal but with inhomogeneous line broadening; the short wavelength edges sharpen at low temperatures, also attributable to a decreasing population of higher crystal field levels at lower temperatures. (iii) The shifts (dλ/dp) in the wavelengths of the fluorescence peaks of the SmP5O14 crystal induced by pressure up to 50 kbar in a diamond anvil cell are small but measurable at room temperature, being about +0.03 nm kbar−1 (+0.3 Å kbar−1). Application of pressures up to 50 kbar to the (Sm2O3)0.248(P2O5)0.752 glass did not alter the positions of the bands within the error in the fluorescence wavelength measurements. Neither the SmP5O14 crystal nor the metaphosphate glass showed any indication of undergoing a phase transition up to the highest pressure reached. A low frequency Raman mode has been observed, which softens with reducing temperature, indicating softening of the associated optical mode and suggesting that, like other RP5O14 crystals, SmP5O14 undergoes a ferroelastic phase transition.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...