Magnetic and structural properties of pure and Cr-doped haematite:α-Fe_(2-x)Cr_(x)O_(3)(0≤x≤1)

作     者：Arvind YOGI Dinesh VARSHNEY 

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：2013年第2卷第4期

页      面：360-369页

核心收录：

学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070205[理学-凝聚态物理] 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] 

基　　金：Authors are thankful to UGC New Delhi for financial assistance 

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

摘      要：Solid-state ceramic technique route is used for synthesizing Cr-doped haematiteaα-Fe_(2-x)Cr_(x)O_(3)(x=0,0.125,0.50 and 1)*** phase and corundum(Al2O_(3))type structure is revealed from the X-ray diffraction(XRD)*** Raman spectra ofαa-Fe_(2-x)Cr_(x)O_(3)illustrate seven phonon *** substitution of Cr(x=0,0.125,0.50 and 1)at Fe site,all Raman active modes are shifted to higher wave *** coercivity and remanence of Cr-doped haematites increase as x *** increased coercivity and remanence for Cr-doped samples can be attributed to their enhanced shape and magneto-crystalline *** observed isomer shiftδdvalues from room-temperature Mössbauer data clearly show the presence of ferric(Fe^(3+))and Cr^(3+)ions illustrating strong ferromagnetic ordering up to x=0.125 inaα-Fe_(2-x)Cr_(x)O_(3)haematite and weak ferromagnetic ordering foraα-Fe2-xCrxO_(3)(x0.125)haematites.