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A quartz tube adapted for thermal processing of semiconductor substrates comprising a double-layered central tube having an external sintered crystalline quartz layer fused with a quartz layer of different quality, i.e. an internal transparent fused quartz layer. Both ends of the central tube are fu

A quartz tube adapted for thermal processing of semiconductor substrates comprising a double-layered central tube having an external sintered crystalline quartz layer fused with a quartz layer of different quality, i.e. an internal transparent fused quartz layer. Both ends of the central tube are fused with the ends of two transparent fused quartz end tubes. The double-layered tube portion can be produced by compacting quartz particulates by means of centrifugal force within a mould and heating from the center with or without placing a fused quartz tube on its inner surface. Semiconductor substrates are processed using this quartz tube, thereby semiconductor devices having stabilized high qualities are produced at an increased yield as well as at a low cost.

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1. A quartz tube adapted for thermal processing of semiconductor substrates, comprising: a double-layered central tube having an external sintered crystalline quartz layer fused with an internal transparent fused quartz layer, wherein both ends of said central tube are fused with the ends of two tra

1. A quartz tube adapted for thermal processing of semiconductor substrates, comprising: a double-layered central tube having an external sintered crystalline quartz layer fused with an internal transparent fused quartz layer, wherein both ends of said central tube are fused with the ends of two transparent fused quartz end tubes, which ends of the fused quartz end tubes have substantially the same inner diameter as that of said double-layered central tube. 2. The tube of claim 1, wherein the length of the external layer is substantially equal in length to the length of the internal layer. 3. A method for the thermal processing of semiconductor substrates, comprising the step of: heating said substrates in a quartz tube having a double-layered central tube with an internal transparent fused quartz layer fused with an external sintered crystalline quartz layer, wherein both ends of said central tube are fused with the ends of two transparent fused quartz end tubes, which ends of the fused quartz end tubes have substantially the same inner diameter as that of said double-layered central tube. 4. The method of claim 3, wherein the heating step occurs at greater than 1200° C. 5. The method of claim 3, wherein the length of the external layer is substantially equal in length to the length of the internal layer.