Structural,vibrational and magnetic properties of Ti substituted bulk hematite:-Fe_(2-x)Ti_(x)O_(3)

作     者：Dinesh VARSHNEY Arvind YOGI 

作者机构：Materials Science LaboratorySchool of PhysicsVigyan BhawanDevi Ahilya UniversityKhandwa Road CampusIndore 452001India School of PhysicsIndian Institute of Science Education and ResearchThiruvananthapuram 695016India 

出 版 物：《Journal of Advanced Ceramics》 (先进陶瓷（英文）)

年 卷 期：2014年第3卷第4期

页      面：269-277页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学] 

主　　题：magnetic materials X-ray diffraction(XRD) Raman spectra Mössbauer spectroscopy 

摘      要：Ti doped hematitea-Fe_(2-x)Ti_(x)O_(3)(x=0.0,0.0206 and 0.0344)samples are synthesized using solid-state ceramic route *** phase and corundum(Al_(2)O_(3))type structure is revealed from the X-ray diffraction(XRD)*** substitution of Ti at Fe site,all Raman active modes are shifted to higher wave *** additional feature of Eu(LO)mode at about 660 cm^(-1)is *** E_(u) mode frequency is decreased and pronounced systematically as a function of Ti doping,and it reaches a value of 658 cm^(-1)for x=*** coercivity Hc(remanence M_(r))for x=0.0,0.0206 and 0.0344 are determined to be 995 Oe(0.44 emu/mg),1404 Oe(0.00019 emu/mg)and 2023 Oe(0.00016 emu/mg),*** larger coercivity for Ti doped samples can be attributed to their enhanced shape and magneto-crystalline *** observed isomer shift(d)from room temperature Mössbauer data clearly shows the presence of ferric(Fe^(3+))and Ti^(4+)ordering ofa-Fe_(2-x)Ti_(x)O_(3)for x=0.0344.