Preparation floating zone method

Boride crystals can also, of course, be obtained by other methods, for example, by preparing feed rods, using methods (1) and (2) above, for the floating zone method to grow crystals. 

T. Akashi, H. Iwata and T. Goto, Preparation of BaTi205 single crystal by a floating zone method. Mater. Trans., 44, 802-04 (2003 ... 

S Otani, T Tanaka, Y Ishizawa. Preparation of TiC single crystals from a self-combustion rod by the floating zone method. J Cryst Growth 83 481, 1987. 

Silicon is prepared commercially by heating silica and carbon in an electric furnace, using carbon electrodes. Several other methods can be used for preparing the element. Amorphous silicon can be prepared as a brown powder, which can be easily melted or vaporized. The Gzochralski process is commonly used to produce single crystals of silicon used for solid-state or semiconductor devices. Hyperpure silicon can be prepared by the thermal decomposition of ultra-pure trichlorosilane in a hydrogen atmosphere, and by a vacuum float zone process. 

Terbium metal is obtained from its anhydrous trifluoride, TbFs, or trichloride, TbCls, by thermal reduction with calcium, carried out in a tantalum crucible. Terbium produced by such methods may contain traces of calcium and tantalum. High purity metal can be prepared by various methods such as vacuum remelting, distillation, amalgam formation, floating zone melting, and various chemical processes. 

The preparation of single crystals. The need for fundamental studies of the mechanical, electrical, and surface properties of carbides and nitrides have necessitated the preparation of single crystals.27 Carbide single crystals are prepared by the Vernouil technique, the floating zone technique, and methods involving precipitation from liquid metals. Nitride single crystals are prepared by vapor transport processes. 

The samples used in our investigation were prepared by different methods. Thus, samples 1-4 were the purest and were prepared by the floating molten zone method. Samples 5-6 were grown by the Bridgman method. Sample 7 was prepared by the Bridgman method from a melt containing 25 at.% of excess mercury. 

A maximum of the diffuse background was foimd in the spectrum of sample 7 (Fig. 2) on the left of the (200) selective reflection. This maximum was attributed to the presence of a second phase since it was not observed in the samples prepared by ihe floating molten zone method or by the Bridgman method (Fig. 3). 

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