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首页> 外文期刊>Crystal growth & design >Lead-Free Relaxor Ferroelectric Na0.47K0.47Li0.06Nb0.94Sb0.06O3 Crystals for Optoelectronic Applications
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Lead-Free Relaxor Ferroelectric Na0.47K0.47Li0.06Nb0.94Sb0.06O3 Crystals for Optoelectronic Applications

机译：用于光电应用的无铅弛豫铁电Na0.47K0.47Li0.06Nb0.94Sb0.06O3晶体

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摘要

In the present study, we found that Na0.47K0.47Li0.06Nb0.94Sb0.06O3 (NKLNS) crystals are good piezo-/pyro-/ferroelectric candidate for various electronic and optical applications. Its large single crystals (up to 9 x 8 x 4 mm(3)) were successfully grown by self-flux method. Relaxor type broad and diffused Curie phase transition with maximum dielectric constant around 355 degrees C was obtained. High values of dielectric constant, d(33) coefficient (125 pC/N), and pyroelectric coefficient (similar to 821 mu C m(-2) degrees C-1) were measured. Fatigue-free ferroelectric properties via hysteresis loops and piezoresponse force microscopy were observed. The crystals were found to show good transparency in the UV-visible region and a wide direct-energy band gap of 3.8 eV, along with sharp UV, blue, and green emissions. The crystals exhibited reverse indentation size effect with Meyers index n = 2.19. Thus, NKLNS crystals are a promising lead-free alternative for dielectric, piezo/ferroelectric, and optical applications.
机译：在本研究中，我们发现Na0.47K0.47Li0.06Nb0.94Sb0.06O3（NKLNS）晶体是各种电子和光学应用的良好压电/热释电/铁电候选物。它的大单晶（最大9 x 8 x 4 mm（3））是通过自熔法成功生长的。获得弛豫型宽居里和弥散居里相变，其最大介电常数约为355摄氏度。测量了高介电常数，d（33）系数（125 pC / N）和热电系数（类似于821μC m（-2）摄氏度C-1）。通过磁滞回线和压电响应力显微镜观察到无疲劳铁电性能。发现该晶体在紫外可见区域显示出良好的透明度，并且在3.8 eV的宽直能带隙以及强烈的紫外，蓝色和绿色发射下显示。晶体表现出反向压痕尺寸效应，迈耶斯指数n = 2.19。因此，NKLNS晶体是介电，压电/铁电和光学应用中有希望的无铅替代品。

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