【作者】 林存丽； 周宁； 郑泽源； 胡晓琳； 庄乃锋；

【Author】 Cunli Lin;Ning Zhou;Zeyuan Zheng;Xiaolin Hu;Naifeng Zhuang;College of Chemistry,University of Fuzhou;Institute of Optical Function Crystalline Materials,University of Fuzhou;

【机构】 福州大学化学学院； 福州大学光功能晶态材料研究所；

【摘要】 钙钛矿型稀土铁酸盐晶体ReFeO₃具有优异的磁光性能,可用作光隔离器、磁光开关、光调制器等光通讯基础器件的核心材料。但是ReFeO₃的常温稳定相属于正交晶系,因存在双折射效应而难以获得实际应用。因此,如何消除ReFeO₃晶体的双折射效应是其获得实际应用的关键所在。本文在密度泛函理论模拟的基础上[1],通过离子掺杂获得立方相的La_0.7Sr_0.3Fe_0.7V_0.3O₃和Ce_0.7Sr_0.3Fe_0.7V_0.3O₃化合物,并采用提拉法成功生长获得立方相的La_0.7Sr_0.3Fe_0.7V_0.3O₃高质量晶体,其所加工的晶片如图1a所示。从热磁曲线测试结果（图1b）可以发现,La_0.7Sr_0.3Fe_0.7V_0.3O₃晶体的反铁磁-顺磁的转变温度从LaFeO₃的740K[2]大幅提高至905K,将有利于提高晶体磁光性能的温度稳定性和适用范围。更多还原

【Abstract】 Rare earth ferrite（ReFeO₃） crystal has excellent magneto-optical performance and is the core material of optical isolator,magneto-optical switches,optical modulators and other communication devices.However,due to the birefringence effect,ReFeO₃ crystal is difficult to be applicated.Therefore,it is important to eliminate the birefringence effect of ReFeO₃.Based on DFT simulation,La_0.7Sr_0.3Fe_0.7V_0.3O₃ and Ce_0.7Sr_0.3Fe_0.7V_0.3O₃ cubic compounds have synthesized by solid phase method,and La_0.7Sr_0.3Fe_0.7V_0.3O₃ cubic crystal,as shown in Fig.la,has been grown by Czochralski method.Thermal magnetic curves（Fig.1b） show antiferromagnetic-paramagnetic transition temperature of La_0.7Sr_0.3Fe_0.7V_0.3O₃ crystal substantially increases from 740 K（LaFeO₃） to 905 K,which will be beneficial to improve the temperature stability and expand the scope of practical application.更多还原