Author/Authors :
Man-Rong Li، نويسنده , , Maria Retuerto، نويسنده , , Yong Bok Go، نويسنده , , Thomas J. Emge، نويسنده , , Mark Croft، نويسنده , , Alex Ignatov، نويسنده , , Kandalam V. Ramanujachary، نويسنده , , Walid Dachraoui، نويسنده , , Joke Hadermann، نويسنده , , Meibo TANG، نويسنده , , Jing-Tai Zhao، نويسنده , , Martha Greenblatt، نويسنده ,
Abstract :
Single crystals of Bi3Mn1.9Te1.1O11 were prepared from NaCl+KCl flux. This compound adopts KSbO3-type crystal structure as evidenced by electron and single crystal X-ray diffraction analysis. The three-dimensional channel structure is formed by corner-sharing octahedral (Mn0.63Te0.37)2O10 dimers and two identical (Bi1)4(Bi2)2 interpenetrating lattices. The intra-dimer Mn/Te–Mn/Te distances in Bi3Mn1.9Te1.1O11 are short and are consistent with weak metal–metal interactions. The mixed oxidation state of manganese and the edge-sharing octahedral features are confirmed by X-ray near edge absorption spectroscopy measurements, which indicate Bi3(MnIII1.1MnIV0.8)TeVI1.1O11 with 57.7% Mn3+ and 42.3% Mn4+. The partial substitution of Te for Mn perturbs long-range magnetic interactions, thereby destroying the ferromagnetic ordering found in Bi3Mn3O11 (TC=150 K).
Keywords :
Bi3M3O11 , KSbO3-type crystal structure , X-ray absorption near edge spectroscopy , Magnetism , Metal–metal interaction
