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首页> 外文期刊>Crystal growth & design >Self-Adjusted Traveling Solvent Floating Zone Growth of Single Crystal CaFe2O4
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Self-Adjusted Traveling Solvent Floating Zone Growth of Single Crystal CaFe2O4

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Single crystals of high-quality CaFe2O4 have been grown successfully using a self-adjusted traveling solvent floating zone method with a four-mirror optical furnace in oxygen atmosphere. Although CaFe2O4 has been reported to melt incongruently, the optimal molten zone has been achieved through a self-adjusted cooling following the liquidus line directly using the stoichiometric CaFe2O4 as both the feed and flux rods in the beginning. Details regarding long-term stability of the molten zone and lamp power optimization to obtain the bubble-free molten zone are discussed. The obtained large single crystal of a few centimeters long and similar to 0.5 cm in diameter shows homogeneous stoichiometry and crystallinity as verified by the optical microscopy and synchrotron X-ray diffraction structure refinement. Long range ferrimagnetic spin ordering of T-N approximate to 180 K is confirmed from the measurement of magnetization as a function of temperature, which shows significant thermal hysteresis and field dependence. Curie-Weiss law fitting of homogeneous susceptibility data above T-N in the paramagnetic regime suggests that the localized spins of Fe3+ are close to the high spin state of d(5) with S = 5/2 in an octahedral crystal field, and the negative Weiss temperature of Theta approximate to -115 K is consistent to a ferrimagnetic ground state of antiferromagnetically ordered spins in unequal size.

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