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首页> 外文期刊>Phase Transitions >Spontaneous strain of conductive strontium titanate Sr_(1-x)La _x TiO_3 measured by using X-ray topographic domain contrast
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Spontaneous strain of conductive strontium titanate Sr_(1-x)La _x TiO_3 measured by using X-ray topographic domain contrast

机译：X射线形貌域对比测量导电钛酸锶锶Sr_（1-x）La _x TiO_3的自发应变

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摘要

We have measured the spontaneous strain c/a - 1 of the antiferrodistortive phase transition in the conductive strontium titanates Sr_(1-x)La _xTiO_3 with x = 0, 0.005, 0.010, and 0.050 by using X-ray topographic domain contrast. We have found that the substitution of a small amount of La~(3+) ions into SrTiO_3 leads to the large increase of the phase transition temperature Ta, the saturated spontaneous strain (c/a - 1)s, and the saturated order parameter s. The values of Ta and (c/a - 1)s of Sr_(0.95)La_(0.05)TiO_3 are twice as large as those of SrTiO_3. These findings indicate that the large increase of T_a, (c/a - 1)s and s are not caused by the doped conduction electrons, but by the crystal structure change, due to the substitution of La~(3+) ions into Sr~(2+) sites.
机译：我们已经通过X射线形貌域对比测量了导电钛酸锶锶Sr_（1-x）La _xTiO_3中x = 0、0.005、0.010和0.050的反铁电相变的自发应变c / a-1。我们发现，将少量La〜（3+）离子代入SrTiO_3会导致相变温度Ta，饱和自发应变（c / a -1）s和饱和阶数参数大幅增加。 s。 Sr_（0.95）La_（0.05）TiO_3的Ta和（c / a-1）s值是SrTiO_3的两倍。这些发现表明，T_a，（c / a-1）s和s的大幅度增加不是由掺杂的导电电子引起的，而是由晶体结构的变化引起的，这是由于La〜（3+）离子被Sr取代所致。 〜（2+）个网站。

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