X-ray diffraction studies are made on proton conducting polar lithium hydrazinium sulfate and ferroelectric lithium ammonium sulfate. The X-ray rocking curves recorded with in situ electric field along the polar b axis of lithium hydrazinium sulfate (direction of proton conductivity) show a strong enhancement of the 0k0 diffraction intensity. The corresponding 0k0 X-ray topographs reveal extinction contrast consisting of striations parallel to the polar axis. They disappear when the electric field is switched off. The effect is very strong in 0k0 but invisible in h0l reflections. It is present only if the electric field is parallel to the polar axis b. This unusual X-ray topographic contrast is correlated with the proton conduction. It is supposed that, under electric field, an inhomogeneous charge distribution develops, distorting the crystal lattice. Similar experiments on lithium ammonium sulfate also show contrast variations, but of quite different behaviour than before. In this case they result from changes of the ferroelectric domain configuration under electric field.
对质子传导极性硫酸肼锂和铁电性硫酸铵锂进行了 X 射线衍射研究。沿硫酸肼锂的极性 b 轴(质子传导方向)原位电场记录的 X 射线摇摆曲线显示,0k0 衍射强度强烈增强。相应的 0k0 X 射线拓扑图显示了由平行于极轴的条纹组成的消光对比。关闭电场后,条纹消失。这种效应在 0k0 反射中非常强烈,但在 h0l 反射中却不明显。这种不寻常的 X 射线地形对比与质子传导有关。据推测,在电场作用下,会产生不均匀的电荷分布,从而扭曲晶格。在硫酸铵锂上进行的类似实验也显示出对比度的变化,但与之前的表现截然不同。在这种情况下,它们是由电场作用下铁电畴构型的变化引起的。