Polymorphism of the bivalent metal vanadates MeV2O6 (Me = Mg,Ca, Mn,Co, Ni,Cu, Zn,Cd) |
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| Institution: | 1. Department of Materials Physics, Zhejiang Normal University, Jinhua, 321004, China;2. Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, 321004, China;3. College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, 321004, China;1. School of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;2. School of Electronic and Information Engineering, Changshu Institute of Technology, Changshu 215500, Jiangsu, China;3. State Key Laboratory of Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210023, China;1. Department of Applied Chemistry, Ramakrishna Mission Vidyamandira, Belur Math, Howrah, 711202 West Bengal, India;2. Department of Chemistry, Presidency University, 86/1 College Street, Kolkata 700073, India;3. Department of Physics, Presidency University, 86/1 College Street, Kolkata 700073, India;1. Department of Physics, St Gregorios College, Kottarakara 691531, India;2. Department of Optoelectronics, University of Kerala, Thiruvananthapuram 695581, India |
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| Abstract: | Based on the literature data, our former findings and additional DTA and high-temperature X-ray studies performed for CdV2O6, MgV2O6, and MnV2O6, a consistent scheme of the phase transformations of the MeV2O6 (Me = Mg, Ca, Mn, Co, Ni, Cu, Zn, Cd) metavanadates is constructed at normal pressure between room temperature and melting points. Three types of structures exist for the considered compounds: brannerite type (B), pseudobrannerite type (P), and NiV2O6 type (N). The following phase transformations have been observed: Me = Mg, B → P at 535°C; Me = Mn, B → P at 540°C; Me = Co, N → B at 660°C; Me = Cu, B (with triclinic distortion) → B at 625°C (secondary order); and Me = Cd, B → P at 170°. CaV2O6P, NiV2O6N, and ZnV2O6B exist in unique form in the entire temperature range. P-form seems to be favored by Me of larger ionic radii. N-form seems to appear at a peculiar d-shell structure and small Me size. Preliminary explanation of the dependence of the structure type on Me size is offered. New X-ray data are given for CdV2O6B, CdV2O6P, MgV2O6B, MgV2O6P, and MnV2O6P. |
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