FIZIKA A 4 (1995) 2, 439-443

MEASUREMENT OF DESORPTION FROM THE POLYCRYSTALLINE LAYER OF TiO₂ IN INCANDESCENT LAMPS

VIERA DUBRAVCOVA and JOZEF IVAN^*
Dept. of Microelectronics, FEI, Slovak Technical University in Bratislava, Slovak Republic
^*TESLA Nove Zamky Co., Nove Zamky, Slovak Republic

Received 3 July 1995

The pressure increase due to the desorption was measured in closed vacuum systems of incandescent lamps with tungsten filament. The inside surface of the glass bulbs was covered with light diffusing layer of TiO₂. Pressure differences were measured in clear lamps and lamps frosted with TiO₂. Desorption was stimulated by increasing the temperature for fixed intervals of time. Pressure was determined from the filament I-V characteristics that were transformed to a linear plot. At 210 ^°C, desorption was approximately four times higher in TiO₂ coated lamps than in clear lamps.

UDC 538.971
PACS 79.40.+z

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