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Silicon single crystal fibers with a constant diameter as small as 200 µ m have been successfully grown by the micro pulling down technique. Grown crystal fibers are uniform in shape and contain a large defect-free volume. Basic parameters for stable growth were discussed in association with the conservation of mass and heat as well as the meniscus stability of the molten zone.

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Abstract[Sr2Cu2Oa] [CuO2]x (x = 1.436), Mr=487.5, orthorhombic, ll.tA21ma, ltarA21rna 1,,1 Ts~.J,', Ts~, a = 11.457(5), b = 13.409 (9), c~ = 3.935 (3), c2 = 2.740 (2) A, k~ = b* + 1.436 (2!c~*, k2 = b* + 0.696 (1)c2", V~ = 604.5, I/2 = 420.9A, Z=4, Dx=5.36Mgm-3, MoKa, ,~= 0.71073 A, /x = 28.9 mm-~, F(000) = 890.5, room temperature, final R = 0.057 for 314 unique reflections. The first subsystem [Sr2Cu203] is composed of (Cu203)oo sheets perpendicular to the b axis and Sr ions coordinated to the sheet. The second subsystem is (CuO2)oo infinite chains parallel to the c axis, which are located among the Sr ions of the first subsystem. The atomic positions are modulated along the c axis by the interactions between the two subsystems.