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首页> 外文期刊>Journal of Crystal Growth >Electrochemical growth near the Ba_(1-x)K_xBiO_3 (x > 0.5)-Ba_(1.7)K_(1.3)Bi_2O_7 boundary and the crystals properties
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Electrochemical growth near the Ba_(1-x)K_xBiO_3 (x > 0.5)-Ba_(1.7)K_(1.3)Bi_2O_7 boundary and the crystals properties

机译：Ba_（1-x）K_xBiO_3（x> 0.5）-Ba_（1.7）K_（1.3）Bi_2O_7边界附近的电化学生长和晶体性质

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摘要

We report on the cubic Ba_(1-x)K_xBiO_3 and tetragonal Ba_(1.7)K_(1.3)Bi_2O_7 phases nucleation and stability in time under the electrochemical crystal growth conditions from a KOH melt. BaBiO_3 single-crystal plates have been used as a seed to stimulate either oriented or epitaxial nucleation. In order to reach the maximum Ba substitution in the cubic phase crystals, a flux saturated with Bi_2O_3 has been selected to grow the x = 0.67 crystal, which reveals T_c ～ 4.5 K. Crystals of the tetragonal phase (a = 4.277 A, c = 21.885 A) up to some mm3 in size have been grown at the same potential, when the Bi_2O_3 concentration in the flux was decreased to 9 x 10~(-4) mol/KOH mole. New crystals of Ba_(0.9)K_(0.2)Bi_(0.9)O_3 belong to a cubic phase (a = 4.266 A), but are nonsuperconducting as first grown. The large crystals morphology, as well as magnetic properties, are discussed.
机译：我们报道了在KOH熔体的电化学晶体生长条件下，立方Ba_（1-x）K_xBiO_3和四方Ba_（1.7）K_（1.3）Bi_2O_7相的成核和时间稳定性。 BaBiO_3单晶板已用作种子，以刺激取向或外延成核。为了在立方相晶体中获得最大的Ba取代，已选择用Bi_2O_3饱和的焊剂来生长x = 0.67晶体，这表明T_c〜4.5K。四方相晶体（a = 4.277 A，c =当助焊剂中的Bi_2O_3浓度降低到9 x 10〜（-4）mol / KOH摩尔时，在相同的电位下可以生长到21.885 A）到几mm3的大小。 Ba_（0.9）K_（0.2）Bi_（0.9）O_3的新晶体属于立方相（a = 4.266 A），但在初次生长时是非超导的。讨论了大晶体的形态以及磁性。

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