H. Peisl

Gitterfehlordnung in KCl mit Farbzentren

AbstractColor centers were created in KCl single crystals by additive coloration and X-irradiation at room temperature. Change of lattice parameter was determined by an X-ray method and change of mass density by a hydrostatic flotation method. Combination of these results, together with optical absorption measurements, led to the following results: F centers in additively colored KCl are Schottky defects. They cause a lattice expansionΔ v/v=0.58 perF center.F centers in X-irradiated KCl are parts of Frenkel defects. During irradiation atoms are displaced to interstitial lattice sites. The volume expansion isΔ v/v=1,15 perF center.

Agglomeration of point defects in copper after neutron irradiation at 4.6 K

Discussion of Huang scattering and the interstitial clusters in copper single crystals after neutron irradiation.

Gitterkonstanten- und Dichteänderung durchF-Zentren in KBr

F centers were created in KBr by additive coloration. Change of lattice parameter was determined by the X-ray diffraction method and change of mass density by a hydrostatic flotation method. Combination of these results led to a lattice expansion of 0.6 atomic volumes perF center. Using elastic approximation the microscopic dilatation around anF center is obtained.

Evidence for Frenkel defect formation in low-temperature X-irradiated KCl and KBr

Abstract Combined measurements of lattice parameter and macroscopic length change give evidence that Frenkel defects are created in KCl and KBr during X-irradiation at 8°K.

Erholungsvorgänge in UV-bestrahltem Silberchlorid

The formation of defects in AgCl single crystals under UV and X-ray exposure and their thermal annealing are studied by measuring the optical density, the lattice parameter change, the X-ray Ag-reflection and by electronmicroscopical observations. Specks of crystalline silver are found to be produced at the surface of the crystals as well as in the interior. According to surface and volume darkening the isochronal annealing curves exhibit two stages. The activation energy for stage I, (0,59±0,08) eV, is suggested to be the energy for the thermal formation of electrons and Ag0+-ions from Ag-aggregates. Stage II appears when the crystal is annealed in chlorine at above 523 °K. It is due to the regeneration of silver at the surface, where chlorine was able to leave the crystal during exposure.

Thermische Erholung UV-bestrahlter AgCl-Einkristalle

[1] CREMER, M. : Aufgabe und Funktion des Insti tuts flit Dokumentationswesen. Mitt. Max Planek-Ges. 1963, H. 1/2, 77--86. [2] PIETSCI L E.: Struktur von Informationseinrichtungen. Nachr. Dok. 15, H. l, 28--4t (1964). [8] SCHEELE, M.: Die Lochkartenverfahren in Forschung und Dokumentation, mit besonderer Bertieksichtigung der Biologie, 2. Aufl. Stut tgart : Sehweizerbart f959. [4] SCHEEL~, M.: Literatur fiber Loehkartenverfahren. Eine vermittels SiehtIoehkarten aufgeschlfisselte Bibliographie tiber Loehkarten und die mit ihrer Anwendung zusammenh~ngenden Fragen. Schlitz/Hessen: H. Guntrum II. K. G. 1959. I5] SCHNEiDER, K. : Fiinf Jahre KWIC-Indexing nach H. P. LUH~. Nachr. Dok. 14, It. 4, 200--205 ( t 9 6 3 ) . [6] SENGBUSCH, R. v.: Probleme der Auslese und ihre Beziehungen zu unserem kulturellen Leben. Jahrb. Max-Planek-Ges. 1959, 135--t85.

M-Zentrenbildung in röntgenbestrahltem KCl

The equilibrium betweenF- andM-center concentration in KCl after X-irradiation at temperatures between 77 °K and 298 °K has been studied. At low temperatures (<200 °K) onlyF-centers which are formed statistically as nearest neighbours give aM-center. At higher temperaturesF-centers within a certain sphere of interaction with a radiusr formM-centers. The temperature dependance of this radiusr has been evaluated. The equilibrium constantK depends on the temperature in the form K=K0exp(-Q/kT). The activation energy was determined to be Q=(0.5±0.1) eV.

Gitterkonstanten- und Dichteänderung durch F -Zentren in KBr

F centers were created in KBr by additive coloration. Change of lattice parameter was determined by the X-ray diffraction method and change of mass density by a hydrostatic flotation method. Combination of these results led to a lattice expansion of 0.6 atomic volumes perF center. Using elastic approximation the microscopic dilatation around anF center is obtained.

Gitterkonstanten- und Dichteänderung durchF-Zentren in KBr@@@Change of lattice parameter and density due toF-centers in KBr

F centers were created in KBr by additive coloration. Change of lattice parameter was determined by the X-ray diffraction method and change of mass density by a hydrostatic flotation method. Combination of these results led to a lattice expansion of 0.6 atomic volumes perF center. Using elastic approximation the microscopic dilatation around anF center is obtained.