Single crystal growth of spin ladders and related compounds at high pressure.

高压（HP）合成是一种强大的技术，可以用来寻找新材料。我们已经发现了许多低尺寸磁铁这样的高T_c超级导体和旋转梯子化合物使用这种技术。一般地说，怎么说，用它来做几乎是不可能的，因为缺乏关于HP-HT （高温）反应的信息。从同步加速器辐射中启用高能量、高通量X射线，使我们能够观察到惠普细胞中的这种反应，即使样品是黄金或铂胶囊。“The Melting Point of the Samples with各种各样的液体已经确定了，这样的信息已应用于单一的水晶生长。HP phase of （VO）_2 P_2 O_7： S =1/2 one dimensional alternating exchange antiferManagement magnet with a spin gap。在春季BL 14 B1的BL 14 B1上安装了一个立方体-砧型高压设备，并清楚地显示了从AP阶段到HP的转变 ... More phase at 3 GPa and 500 C and the melting at 1150 C. Single crystals were obtained by slowly cooling the melt from 1300 C to 700 C in 60 h at 3 GPa using a in-house HP apparatus. 2. Ca_<2-x>Na_xCuO_2Cl_2 ：具有chlorine instead of apical oxygen的High Tc superconductor。这是一个理想的化合物，用于成像和STM测量，因为a）容易清除（新鲜CuO_2平面可用）， b）注射的超导体可用的绝缘器样本， c）温度低的不存在其他偏置， d）没有调制。Ca_2CuO_2Cl_2、NaClO_4和NaCl的混合物从1250 ° C冷却到1050 ° C，在各种压力下冷却到类似平板的晶体。NaClO_4作为通量、钠源和氧发生器工作。那内容可能是通过改变水晶生长期间的压力来调整的。CaFeo_3 ：a distorted perovskite （GdFeO_3 type） with unusual Fe^<4+> ion which shows charge disproportionation to Fe^<3+> and Fe^<5+> below room temperature。KClO_4、NaClO_4和CaCl_2的混合物被用作通量和氧发生器。Less（低）

High pressure (HP) synthesis is a powerful technique to search for new materials. We have discovered many low dimensional magnets such as high-T_c superconductors and spin ladder compounds using this technique. Generally speaking, however, it used to be almost impossible to obtain single crystal samples of these high-pressure phases because of the lack of the information about the HP-HT (high temperature) reactions. High energy, high flux X-ray from synchrotron radiation enabled us to observe such a reaction in a HP cell even if the sample is in a gold or a platinum capsule. The melting point of the samples with various kinds of flux were determined and such information was applied for the single crystal growth.1. HP phase of (VO)_2P_2O_7 : S =1/2 one dimensional alternating exchange antiferromagnet with a spin gap. The powder XRD data collected with a cubic-anvil type high-pressure apparatus installed at BL14B1 of Spring-8 clearly showed the transformation from the AP phase to the HP … More phase at 3GPa and 500゜C and the melting at 1150゜C.Single crystals were obtained by slowly cooling the melt from 1300゜C to 700゜C in 60h at 3GPa using a in-house HP apparatus.2. Ca_<2-x>Na_xCuO_2Cl_2 : High Tc superconductor with chlorine instead of apical oxygen. It is an ideal compound for photoemission and STM measurements because a) easy to cleave (fresh CuO_2 plane is available), b) samples from insulator to doped superconductor are available, c) there is no orthorhombic distortion at low temperature, d)it has no modulation. Mixtures of Ca_2CuO_2Cl_2, NaClO_4 and NaCl were slowly cooled from 1250゜C to 1050゜C at various pressures to obtain plate-like crystals. NaClO_4 worked as flux, Na source and oxygen generator. The Na content could be tuned by changing the pressure during the crystal growth.3. CaFeO_3 : a distorted perovskite (GdFeO_3 type) with unusual Fe^<4+> ion which shows charge disproportionation to Fe^<3+> and Fe^<5+> below room temperature. A mixture of KClO_4, NaClO_4 and CaCl_2 was used as flux and oxygen generator. Less