A high-temperature phase transition in strained ferroelectric K 0.9 Na 0.1 NbO 3 thin films epitaxially grown on orthorhombic (110) NdScO 3 substrates is identified and investigated by in situ x-ray diffraction and piezoresponse force microscopy. At room temperature, the thin films exhibit a highly anisotropic misfit strain, inducing the occurrence of monoclinic a 1 a 2 /M C phases and manifesting itself in the formation of a highly regular, herringbone-like domain arrangement. With increasing temperature, a ferroelectric-to-ferroelectric phase transition to an orthorhombic a 1 /a 2 phase with exclusive lateral electrical polarization takes place. Within a wide temperature range from 180 °C to about 260 °C, a coexistence of the monoclinic a 1 a 2 /M C room temperature phases and the orthorhombic a 1 /a 2 high temperature phase is observed. Fi...

中文翻译：

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多畴K 0.9 Na 0.1 NbO 3外延薄膜中的铁电相变

在正交各向异性（110）NdScO 3衬底上外延生长的应变铁电K 0.9 Na 0.1 NbO 3薄膜中，确定了高温相变并通过原位X射线衍射和压电响应力显微镜进行了研究。在室温下，薄膜表现出高度各向异性的失配应变，导致单斜晶1 a 2 / MC相的出现，并以高度规则的人字形畴排列形式出现。随着温度升高，发生铁电-铁电相转变为正交的a 1 / a 2相且具有唯一的横向极化。在180°C至约260°C的宽温度范围内，观察到单斜晶a 1 a 2 / MC室温相与斜方晶a 1 / a 2高温相共存。Fi ...