Single Crystal Growth at Warwick

我们建议继续在沃里克成功的晶体生长活动的基础上再接再厉。我们将生产高品质的单晶的氧化物，硼化物，碳化物和硅化物的整个范围。这些材料包括超导体（NaxCoO 2·yH 2 O）、各种低维和受抑磁性材料（RBaCo2O5.d、Ca 3Co 2 O 6、Kagom阶梯化合物、Pyrocarbons、钒酸盐）、铁性材料（RMn 2 O 5）以及磁性和/或超导的硼化物和碳化物（RB 2C 2、RB 2C、六硼化物）。在可能的情况下，这些晶体将使用我们拥有的三个光学镜炉（两个卤素灯炉和一个氙弧灯炉）通过浮区技术生长。对于浮区技术不适用的材料的晶体生长，将使用助熔剂生长和化学气相沉积等替代技术。熔炉使我们能够在不同的生长条件下生长所述的整个材料范围的晶体，从各种气体气氛，高达10 bar的高压和高达3000 C的温度。提案中提到的一些材料的晶体生长将作为第一次尝试进行，因为它们以前可能从未以这种形式生产过。这将需要多次生长尝试来优化生长条件。所生长的单晶将用于我们的EPSRC和CCLRC资助的项目（与过去一样）。这些晶体也将广泛提供给英国和国际上的其他研究人员。

We propose to continue to build on our successful crystal growth activities at Warwick. We will produce high quality single crystals of a whole range of oxides, borides, carbides and silicides. These include superconductors (NaxCoO2 yH2O) various low dimensional and frustrated magnetic materials (RBaCo2O5.d, Ca3Co2O6, Kagom staircase compounds, Pyrochlores, vanadates), ferroics (RMn2O5) and borides and carbides which are both magnetic and/or superconducting (RB2C2, RB2C, hexaborides). These crystals will be grown by the floating zone technique using the three optical mirror furnaces that we have (two halogen lamp furnaces and one xenon arc lamp furnace), where possible. Alternative techniques such as flux growth and chemical vapour deposition will be used for the crystal growth of materials where the floating zone technique is not applicable. The furnaces allow us to grow crystals of the entire range of materials described under different growth conditions, ranging from various gas atmospheres, high pressures of up to 10 bars and temperatures of up to 3000 C. The crystal growth of some materials named in the proposal will be carried out as a first attempt as they may have never been produced in this form before. This will necessarily require several growth attempts to optimise the growth conditions.The single crystals grown are to be used in our EPSRC and CCLRC funded projects (as in the past). The crystals will also be made widely available to other researchers within the UK and internationally.