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Zinc SulphidesIn order to explain the detailed mechanism of TL, the triboand photoluminescence (PL) spectra were recorded for ZnS:Mn with Mn concentra- Cu, C1. TheWe obtained the following results:1. No spectral lines of gas-discharge were found. 2.In all TL-spectra only P1-bands were observed.3. ZnS:Mn and ZnS-Ag showed the same TL-and PL-spectra, if small shifts in emission bands are neglected. 4.The TL-spectra of ZnS:Cu and (ZnCd)S:Cu exhibited a greater intensity ratio 5. Q of ZnS:10-3 Cu, C l is a function of mechanical stress time.6. Compared to the PL, the TL-band shows a shift which can be attributed to of the blue to green band (Q = I,, /I than the PL-spectra.1 gJ the high mechanical stresses during impact (2).With these results it has been proved that the TL of zinc sulphide powders results mainly from a solid &ate luminescence. To explain the mechanism of TL, electroluminescence (EL) spectra were recorded with varying field frequency. In addition the TL-intensity and stress, measured with piezoelectrics, were recorded simultaneously with a double-beam oscilloscope.In accordance with the results of (3) and (4) the ratio Q for ZnS:Cu, C1 was very strongly dependent on the field frequency f. Therefore it was possible to identify the TL-spectra in the power jet of the mill with the EL-spectra. at 15 kHz (Fig. 1).The identity between TL-and EL-spectra can be explained only if on6 assumes an

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Zur Tempersturabhangigkeit der Tribolumineszenzmciisrtrcd iit the iiit,crvd betwecii 20' arid 300 "C ;it heating or cooling rates of 1 -20 gut initi-I. Tlio tribolumiucscoticc is cotistitiit rip t,o zt clcfiiiite temperat iirv miel t,heii got's grutluully agiiiiist zero bccnitsc: tho clcctrical cotitliictivity increastbs with risittg tcwywriitrirc. Thc rcproducibility is not vcry wcll i~i i c l will be refered t o 1 t ndrf i tiit hlc s i t rfitct. li~.yc:rs. Tho f r rroclrc t>ri c t r i gl yc i t 1st t 1 fit t t? shows I LO an omnl y ;it t h r Ciiriv poitit ( i 47 T).