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  • 2000-2004  (1)
  • 1985-1989  (4)
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  • 1
    Digitale Medien
    Digitale Medien
    Determination of crystallographic polarity of CdTe crystals with Auger electron spectroscopy (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 924-927 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The crystallographic polarity of CdTe crystals has been studied with Auger electron spectroscopy. The polarity of various surfaces could be determined by normalizing the low-energy Te (NOO) peak with the high-energy Te (MNN) peak. Upon comparing the normalized ratios from both {111} surfaces, the ratio from (111) Te surfaces was found to be about 1.3 times that from (111) Cd surfaces. The identified polarity was consistent with recent results of anomalous absorption of x rays, the convergent beam method of transmission electron microscopy, and chemical etching. Air-cleaved {110} surfaces of CdTe crystals and surfaces of pure Te crystals were studied for comparison as well.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.338143
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  • 2
    Digitale Medien
    Digitale Medien
    Preparation and thermoelectric properties of CeFe4As12 (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 1344-1348 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The thermoelectric properties of CeFe4As12 have been measured. The compound was synthesized by reacting a powder mixture of CeAs2 and FeAs2 with As metal. The sample was characterized by both x-ray diffractometry and electron microprobe analysis. The Seebeck coefficient, electrical resistivity, Hall effect, and the thermal conductivity were measured between room temperature and about 900 K. The results indicate that CeFe4As12 possesses semimetallic behavior similar to that of CeFe4Sb12 with a room temperature electrical resistivity of 0.49 mΩ cm and a Seebeck coefficient of about 40 μV/K. The thermal conductivity of CeFe4As12 lies between that of CeFe4P12 and CeFe4Sb12 as may be expected from considerations of anionic mass and rattling effect of Ce atoms inside the skutterudite unit cell. A maximum thermoelectric figure of merit value of about 0.4 was obtained at 850 K for this compound. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1427141
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  • 3
    Digitale Medien
    Digitale Medien
    Etching on polar (111) surfaces of CdTe crystals studied with Auger electron spectroscopy (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 4453-4459 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Various reducing and oxidizing etches were applied to the polar (111)Cd and (111)Te surfaces of CdTe crystals. The induced surface layers were studied with Auger electron spectroscopy, and the chemical reactions involved were discussed. A dithionite etch left both (111) Cd and (111)Te surfaces Cd rich. The sulfur in the etch solution appeared to replace Te in the near surface. A hydrazine etch left the Cd to Te ratio about one to one on the surfaces. A large oxygen peak was observed to increase as the etching time and temperature increased, indicating that the etch was not reducing. Hydrogen heat treatment left the surface stoichiometric, free of contamination and crystalline. Hydrogen heat treatment was the best method we have tried to retain the stoichiometry of the (111)CdTe surfaces. The surfaces treated with oxidizing EAg-1 solution were Te rich, and the strong correlation between the relative concentration of Te and Ag suggested a reaction between Te and Ag. The Te(NOO)/Te(MNN) ratio on (111)Te surfaces was always significantly higher than that on (111)Cd surfaces after hydrogen heat treatment or sputter cleaning consistent with the crystallographic polarity we reported previously.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.339033
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  • 4
    Digitale Medien
    Digitale Medien
    Synchronous and noncollinear infrared upconversion in AgGaS2 (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1489-1491 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Synchronous noncollinear upconversion detection is reported for the first time with a Nd:YAG laser in AgGaS2. Q-switched pump laser pulses with a repetition rate up to 50 Hz were synchronized with intracavity chopped continuous wave CO2 laser pulses. Results were obtained both by tuning the CO2 laser and by varying the angle between the laser beams.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.101410
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  • 5
    Digitale Medien
    Digitale Medien
    Photothermal measurements of high Tc superconductors (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 598-599 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We demonstrate a photothermal method for making point measurements of the thermal conductivities of high Tc superconductors. Images made at room temperature on polycrystalline materials show the thermal inhomogeneities. Measurements on single-crystal Bi2Sr2CaCu2Ox compounds reveal a very large anisotropy of about 7:1 in the thermal conductivity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.101843
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