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  • 1990-1994  (1)
  • 1985-1989  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4946-4949 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We studied nonradiative recombination centers in undoped (AlxGa1−x)0.5In0.5Pgrown by metalorganic vapor phase epitaxy using transient capacitance spectroscopy. We found three deep energy levels, including a mid-gap level. We drew an equation to get a capture cross section for minority carriers, and obtained it using isothermal capacitance transient spectroscopy measurement. The mid-gap level had an electron capture cross section of 2 × 10−10 cm2 and a hole capture cross section of 1 × 10−15 cm2. The time constant of nonradiative recombination through the mid-gap level was found to be comparable to that of radiative recombination. We concluded that the mid-gap level is an effective nonradiative recombination center that reduces photoluminescence intensity.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 525 (1985), S. 230-236 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Verbindungsbildung im System PbGeO3—Pb5Ge3O11Die Verbindungsbildung im System PbGeO3—Pb5Ge3O11 wurde mittels Thermoanalyse und Hochtemperatur-Röntgenbeugung untersucht. Neue Modifikationen des PbGeO3 und Pb5Ge3O11 wurden durch gleichzeitige Hydrolyse von Blei- und Germanium-alkoxiden dargestellt. PbGeO3 hat eine hexagonale Einheitszelle mit a = 15,573 und c = 7,240 Å und Pb5Ge3O11 besitzt eine orthorhombische Kristallstruktur mit a = 5,081, b = 7,301 und c = 8,817 Å. Sie werden in die bekannten monoklinen und hexagonalen Modifikationen bei 575 bis 610°C bzw. 410 bis 450°C umgewandelt. Eine Verbindung der Zusammensetzung Pb3Ge2O7 wird nicht bestätigt. Die Strukturen der Germanatgruppen in den Bleigermanaten werden auf der Grundlage von IR-Daten diskutiert.
    Notes: Compound formation in the system PbGeO3—Pb5Ge3O11 was studied by thermal analysis and high-temperature X-ray diffraction. New modifications of PbGeO3 and Pb5Ge3O11 were prepared by the simultaneous hydrolysis of lead and germanium alkoxides, followed by washing and drying; the former has a hexagonal unit cell with a = 15.573 Å and c = 7.240 Å, and the latter has an orthorhombic crystal structure with a = 5.081 Å, b = 7.301 Å and c = 8.817 Å. They are transformed to the known monoclinic and hexagonal modifications at 575 to 610°C and 410 to 450°C, respectively. No compound of Pb3Ge2O7 was confirmed. The structures of germanate groups in the lead germanate compounds are discussed on the basis of the infrared spectral data.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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