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首页> 外文会议>Proceedings vol.2003-29; Epitaxial Growth of Functional Oxides Symposium and Electrochemical Society Meeting; 20031012-17; Orlando,FL(US) >PHASE EVOLUTION AND TEXTURE OF Ba_2YCu_3O_(6+x) FILMS USING THE 'BaF_2 CONVERSION PROCESS'
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PHASE EVOLUTION AND TEXTURE OF Ba_2YCu_3O_(6+x) FILMS USING THE 'BaF_2 CONVERSION PROCESS'

机译：使用BaF_2转化过程的Ba_2YCu_3O_（6 + x）薄膜的相演化和织构

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In situ high-temperature X-ray diffraction (HTXRD) combined with transmission electron microscopy (TEM) were used to study the phase formation sequence, texture, and reaction kinetics of the Ba_2YCu_3O_(6+x) (Y-213) phase using the ex situ "BaF_2 conversion process". Two sets of 1.0 μm thick films on single crystal SrTiO_3 substrates were prepared using an e-beam co-evaporation technique, with BaF_2, Y and Cu sources. At intermediate stages of the conversion process, the amorphous precursor developed into a mixture of a BaF_2-like oxyfluoride phase (a_(BF) ≈ 6.1 A) and CuO. At temperatures close to 700℃, formation of a BaF_2-related superstructure, with lattice parameters tentatively described as a ≈ a_(BF) 3~(1/2), b ≈ a_(BF) 6/2~(1/2), c ≈ a_(BF) 2/2~(1/2), was observed. Ultimately, this precursor mixture of BaF2-related and CuO phases transformed into the Y-213 phase. The resulting Y-213 films were primarily c-axis textured, although significant volume fractions of both a-axis textured and randomly oriented regions were also observed. The growth of Y-213 and the consumption of BaF_2 were found to be approximately linear in time.
机译：原位高温X射线衍射（HTXRD）与透射电子显微镜（TEM）结合使用，研究了Ba_2YCu_3O_（6 + x）（Y-213）相的形成顺序，织构和反应动力学。非原位“ BaF_2转换过程”。使用电子束共蒸发技术，BaF_2，Y和Cu源，在单晶SrTiO_3衬底上制备了两组1.0μm厚的膜。在转化过程的中间阶段，无定形前体发展成为BaF_2状的氟氧化物相（a_（BF）≈6.1 A）和CuO的混合物。在接近700℃的温度下，形成了BaF_2相关的上层结构，其晶格参数暂定为a≈a_（BF）3〜（1/2），b≈a_（BF）6/2〜（1/2）观察到c≈a_（BF）2/2〜（1/2）。最终，BaF2相关相和CuO相的前体混合物转变为Y-213相。所得的Y-213膜主要是c轴织构的，尽管也观察到了a轴织构和随机取向区域的​​显着体积分数。发现Y-213的生长和BaF_2的消耗在时间上近似线性。

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