通过助溶剂熔融法并在氩气气氛炉中成功生长出高质量大尺寸的CaTi2O4的单晶.X射线衍射实验及能量损失谱EDS证实,制备的CaTi2O4单晶晶胞参数a=9.781A,b=9.966A,c=3.148A,所有样品均为单相,且符合化学计量比,样品高纯.通过直流磁化率的测量,首次给出了晶体的Van-Vleck顺磁因子为6.85×10-5cm3/mol,Cure-Weiss温度为-0.44K,呈弱反铁磁性.同时,通过单晶各向磁化率的测量,进一步确认了CaTi2O4晶体中一维有序Ti-Ti反铁磁dimer链的形成,并明确了其方向.
High quality and large-size single crystals of CaTi2 O4 were prepared by the molten salt flux method. The X-ray diffraction and the EDS results showed that all the CaTi2 O4 crystals have the rom temperature lattice parameters a = 9. 781 A,b = 9. 966 A and c = 3. 148 A,and all the samples have perfect stoichiometric composition. Through the magnetic susceptibility measurement,we first obtained the Van-Vleck paramagnetic parameter of CaTi2 O4 of 6. 85 × 10 -5 cm3 /mol, and Cure-Weiss temperature of - 0. 44 K,revealing that CaTi2 O4 is a weak ferromagnetic compound. Further more,the existence of Ti-Ti dimer was confirmed by anisotropy measurement,the structure and direction of the antiferromagnetic dimer chains were also determined.