This study demonstrates the first synthesis of MXene‐derived ferroelectric crystals. Specifically, high‐aspect‐ratio potassium niobate (KNbO₃) ferroelectric crystals is successfully synthesized using 2D Nb₂C, MXene, and potassium hydroxide (KOH) as the niobium and potassium source, respectively. Material analysis confirms that a KNbO₃ orthorhombic phase with Amm2 symmetry is obtained. Additionally, ferroelectricity in KNbO₃ is confirmed using standard ferroelectric, dielectric, and piezoresponse force microscopy measurements. The KNbO₃ crystals exhibit a saturated polarization of ≈21 µC cm⁻², a remnant polarization of ≈17 µC cm⁻², and a coercive field of ≈50 kV cm⁻¹. This discovery illustrates that the 2D nature of MXenes can be exploited to grow ferroelectric crystals.

中文翻译：

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MXene衍生的铁电晶体

这项研究证明了MXene衍生的铁电晶体的首次合成。具体而言，分别使用2D Nb ₂ C，MXene和氢氧化钾（KOH）作为铌和钾源，成功地合成了高纵横比的铌酸钾（KNbO ₃）铁电晶体。材料分析证实获得了具有Amm 2对称性的KNbO ₃正交相。另外，使用标准的铁电，介电和压敏力显微镜测量可以确定KNbO ₃中的铁电。KNbO ₃晶体的饱和极化强度约为≈21µC cm ^-2，剩余极化强度约为≈17µC cm ^-2。和矫顽场≈50kV cm ^-1。这一发现说明，可以利用MXene的2D性质来生长铁电晶体。