Synthesis and characterization of new fluoride-containing manganese vanadates A 2 Mn 2 V 2 O 7 F 2 (A=Rb, Cs) and Mn 2 VO 4 F
作者： Liurukara D Sanjeewa , Michael A McGuire , Tiffany M Smith Pellizzeri , Colin D McMillen , V Ovidiu Garlea
DOI: 10.1016/J.JSSC.2016.05.008
关键词: Single crystal 、 Néel temperature 、 Antiferromagnetism 、 Raman spectroscopy 、 Magnetic susceptibility 、 Nuclear magnetic resonance 、 Monoclinic crystal system 、 Molecular vibration 、 Crystallography 、 Infrared spectroscopy 、 Chemistry
摘要: Abstract Large single crystals of A2Mn2V2O7F2 (A=Rb, Cs) and Mn2VO4F were grown using a high-temperature (~600 °C) hydrothermal technique. Single crystal X-ray diffraction powder utilized to characterize the structures, which both possess MnO4F2 building blocks. The series crystallizes as new structure type in space group Pbcn (No. 60), Z=4 (Rb2Mn2V2O7F2: a=7.4389(17) A, b=11.574(3) A, c=10.914(2) A; Cs2Mn2V2O7F2: a=7.5615(15) A, b=11.745(2) A, c=11.127(2) A). is composed zigzag chains edge-sharing units running along a-axis, interconnected through V2O7 pyrovanadate groups. Temperature dependent magnetic susceptibility measurements on this interesting one-dimensional structural feature based Mn2+ indicated that Cs2Mn2V2O7F2 antiferromagnetic with Neel temperature, TN=~3 K Weiss constant, θ, −11.7(1) K. Raman infrared spectra also analyzed identify fundamental V–O vibrational modes Cs2Mn2V2O7F2. Mn2(VO4)F crystalizes monoclinic C2/c (no. 15), Z=8 unit cell parameters a=13.559(2) A, b=6.8036(7) A, c=10.1408(13) A β=116.16(3)°. associated those triplite wagnerite. Dynamic fluorine disorder gives rise complex alternating five-and six-coordinate Mn2+. These interpenetrating are additionally connected isolated VO4 tetrahedra form condensed structure.
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