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Title: Composition dependent 3C and 6H perovskites, A3MTiSbO9 (A = Sr, Ba; M = Mn, Co): Structural, magnetic and dielectric properties
Authors: Kumar L.
Datta J.
Ray P.P.
Mandal, Tapas Kumar
Published in: Journal of Solid State Chemistry
Abstract: The compounds of the title series, A MTiSbO (A ​= ​Sr, Ba; M ​= ​Mn, Co), are prepared by conventional solid-state reactions. Rietveld structure refinements establish stabilization of complete B-site disordered 3C perovskite structures (space group Pm-3m, No.221) for the Sr containing compounds with all corner connected M /Ti /Sb O octahedra, while for Ba analogs a 6H perovskite structure (space group P6 /mmc, No. 194) is adopted with corner and edge shared octahedral connectivity. While the HR-TEM and SAED reaffirmed the above structure types, XPS supported +3 oxidation states for the transition metals, Mn and Co. Magnetic data revealed paramagnetic behavior down to 5 ​K for the hexagonal perovskites, Ba MnTiSbO and Ba CoTiSbO , while the cubic perovskites, Sr MnTiSbO and Sr CoTiSbO , showed antiferromagnetic-type transitions at ~ 10 and 20 ​K, respectively. The low temperature (at 5 ​K) hysteretic behavior seen in the M ​− ​H data for Sr CoTiSbO is indicative of very weak ferromagnetic interactions, which may originate from a cluster-glass type behavior due to cation–disorder at the B-sites of the 3C perovskite. The higher dielectric constant for the Co member perovskites than the Mn members is attributable to higher carrier mobility, while relatively high dielectric constant for the 3C perovskites is perhaps due to their increased space charge polarization as compared to that of the 6H members.
Citation: Journal of Solid State Chemistry(2020), 282
Issue Date: 2020
Publisher: Academic Press Inc.
Keywords: A3MTiSbO9 (A = Sr, Ba
M = Mn, Co)
Cubic (3C) perovskites
Dielectric property
Hexagonal (6H) perovskites
magnetic property
Antimony compounds
Barium compounds
Cobalt compounds
Dielectric properties
Magnetic properties
Manganese compounds
Solid state reactions
Strontium compounds
A3MTiSbO9 (A = Sr,
ISSN: 224596
Author Scopus IDs: 57212217802
Author Affiliations: Kumar, L., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Datta, J., Department of Physics, Jadavpur University, Kolkata, West Bengal 700032, India
Ray, P.P., Department of Physics, Jadavpur Unive
Funding Details: University Grants Commission, UGC.L. Kumar gratefully acknowledges University Grant Commission, New Delhi for providing research fellowship. The authors are thankful to the MMED, IITR for providing HR-TEM facility. The IIC, IITR is thanked for providing various other instrumental faciliti
Corresponding Author: Mandal, T.K.; Department of Chemistry, India; email:
Appears in Collections:Journal Publications [CY]

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