Abstract: Disclosed is a heated window pane (1), particularly for side windows of vehicles, comprising two differently polarized contact busbars (6, 7) which extend essentially parallel to each other in the longitudinal direction thereof as well as parallel to a bottom edge (2) of the heated window pane (1), and a bunch of heating filaments (9) that electrically contact the contact busbars (6, 7). The inventive window pane (1) is characterized in that the contact busbars (6, 7) are arranged substantially along one line in the longitudinal direction thereof while the heating filaments (9) have essentially the same length such that uniform heating of the entire window pane (1) can be ensured. The heating filaments (9) can be made to have the same length by configuring compensation loops (11) and/or varying the amplitude of a heating filament (9) that is disposed in a wavy shape.

Abstract: Quartz glass element, such as a diffusion tube useful in the production of semiconductor elements, capable of forming an outer layer of uniformly fine crystalline silica such as cristobalite or tridymite when heated to a temperature at which such crystalline silica forms containing crystallization promoting nuclei having a rate of diffusion in quartz glass less than that of sodium at elevated temperatures. Such nuclei are preferably present in the outer half of the element wall. When the quartz glass element is exposed to elevated temperatures, the nuclei promotes the formation of the outer layer of uniformly fine crystalline silica which imparts thermal dimensional stability for extended periods of use at elevated temperatures.