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Crystal growth and characterization of Marokite CaMn_2O_(4+δ)

机译:钙锰矿CaMn_2O_(4 +δ)的晶体生长与表征

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Centimeter-sized single crystals of CaMn_2O_(4+δ), commonly known as Marokite, were grown using the floating-zone method. The growth conditions are reported along with a discussion of a simple method for polycrystalline rod preparation, which differs from the typical cold isostatic pressure procedure. Crystal characterization was determined by powder X-ray diffraction, back-reflection Laue diffraction, iodometric titration, energy-dispersive X-ray spectrometry, and vibrating sample magnetometry. Polycrystalline rods, composed of stoichiometric Marokite, were found to produce crystals with CaMnO_3 as a secondary impurity phase as revealed by magnetic measurements and powder diffraction. Crystals grown from polycrystalline rods with excess manganese oxide produced single crystals of high quality without impurity phases.
机译:使用浮区法生长了厘米大小的CaMn_2O_(4 +δ)单晶,通常被称为Marokite。报道了生长条件并讨论了制备多晶棒的简单方法,该方法不同于典型的冷等静压程序。晶体表征是通过粉末X射线衍射,背反射劳厄衍射,碘量滴定,能量色散X射线光谱法和振动样品磁力法测定的。通过磁测量和粉末衍射显示,发现由化学计量的马洛石组成的多晶棒可产生具有CaMnO_3作为次要杂质相的晶体。由具有过量氧化锰的多晶棒生长的晶体产生了高质量的无杂质相的单晶。

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