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Growth of the substrate crystals for $La_{2-x}Sr_{x}CuO_{4}$ thick films
Watauchi, Satoshi,Tanabe, Hideyoshi,Tanaka, Isao,Kojima, Hironao The Korea Association of Crystal Growth 1999 韓國結晶成長學會誌 Vol.9 No.4
The distribution coefficients of Ni and Zn to the Cu site in $La_{2-x}Sr_{x}CuO_{4}$(LCO) were investigated to determine the suitable solvent composition ofr crystal growth of $La_{2}{Cu}_{1-x}{M}_{x}{O}_{4}$(M=NI, Zn)(LCMO), and were found to be 4.2 for NI and 0.66 for Zn, respectively. Single crystals of LCO, and LCMO of high homogeneity were grown by traveling solvent floating zone technique using suitable solvents. NO diamagnetic signals were observed for all substituted crystals. This fact suggests that crystals of LCO partially substituted by Ni or Zn are useful as substrate crystals.
LPE growth of $La_{2-x}Sr_{x}CuO_{4}$ single-crystalline films
Tanaka, Isao,Tanabe, Hideyoshi,Watauchi, Satoshi,Kojima, Hironao The Korea Association of Crystal Growth 1999 韓國結晶成長學會誌 Vol.9 No.3
$La_{2-x}Sr_{x}CuO_{4}$ single-crystalline films were prepared on bulk single crystals of Zn-doped $La_{2-x}Sr_{x}CuO_{4}$ as the substrates by LPE technique using two deferent methods. When prepared using an alumina crucible in normal electrical furnace, the $La_{2-x}Sr_{x}CuO_{4}$ films were contaminated with less than 3 at% aluminum from the alumina crucibles. Aluminum contamination either reduced or completely destroyed the superconductivity of the $La_{2-x}Sr_{x}CuO_{4}$ films, For LPE growth by modified TSFZ method using an infrared heating furnace without crucibles, the $La_{2-x}Sr_{x}CuO_{4}$ films of x=0.11 showed superconducting with $Tc_{onset}=36\;K$, which is 10 K higher than that in the $La_{2-x}Sr_{x}CuO_{4}$ bulk single crystals.
Floating zone growth of calcium aluminate (Ca12Al14O33)
I. Tanaka,M. Yamanaka,J.K. Park,T. Shimomura,S. Watauchi,K. Kishio 한양대학교 세라믹연구소 2005 Journal of Ceramic Processing Research Vol.6 No.2
Abundance of oxygen radicals residing in the cage-like lattice framework of calcium aluminate makes the growth of good quality single crystal difficult. Oxygen bubbles easily get trapped inside the crystal making the optical properties of the crystal inferior. In this study, we have investigated the behavior of oxygen bubbles inside the molten-zone during a conventional floating-zone growth. We have investigated the effect of different feed preparation process on the quality of the grown crystals and found that subsequent quenching of the feed from 900 °C after calcination at 1200 °C significantly reduces the bubbles in the crystal. Secondly we have performed floating-zone growth of C12A7 under a high magnetic field (up to 8T). We think that each of the bubbles become a small piece of magnet under the magnetic effect and repel each other in the molten zone. As a result we observed significant stabilization of the molten zone through early removal, and a reduction of accumulation of the bubbles.