Michael,
Best Machine on the market is made by Haldore Topsoe in Denmark. They
have the FZ-14 for 4" and smaller, FZ-20 ( a fine machine) for 5-6" or
smaller and now the FZ-30 for larger diameters.
Contact Carl-Vilhelm Rasmussen at mailto:cvr@topsoe.dk for availability.
I use 2 FZ-20 machines for very high quality Float Zone ingot and with
the right procedural and process controls can obtain very high
resistivity and lifetime product- as well as lower grade usable for
specific resistivity for NTD needs.

Please contact me should you want any more information.

Best Regards,
Ken Smith
Kmbh Associates
47 Rocket Circle
Rancho Cordova, CA 95742  U  S  A
510-714-5055 Efax- 510 217 4421 or 561 658 6136

High Purity Float Zone and Specialty CZ Silicon  for Power, IR and
Mirror Optics, Optoelectronics, MEMS, SOI, and other Semiconductor
applications. Quartz, Glass, Pyrex and Borofloat Wafer Supply. Anodic
Bonding. SOG, SOS.

Michael Cao wrote:

> We are in urgent need of one or more new or refurbished FZ grower. For 4"
single-crystal silicon growth.
> Would you please help by providng information on it?
>
> Best regards,
>
> Michael Cao
>


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