title: Magneto-structural coupling in [Formula: see text].
abstract: [Formula: see text] compound is well Known to show the frustration of the spin structure. At 12 K, [Formula: see text] distorts to break symmetry of the degenerated frustrated spin states by the spin-Peierls-like phase transition, accompanying with the antiferromagnetic ordering. On the other hand, [Formula: see text] undergoes a Jahn-Teller phase transition at a temperature of 310 K, differing from the low temperature ferrimagnetic transition temperature [Formula: see text] of about 60 K. It is also reported that [Formula: see text] shows another magnetic phase transition at about 30 K. These two phase transitions accompanying with the lattice change can be understood by the magneto-elastic interactions. Two interactions, the Jahn-Teller interaction and the spin-Peierls-like interaction are co-exist in [Formula: see text] system. In this report the [Formula: see text] compounds with x = 0.8, 0.6 and 1 are investigated by the X-ray diffraction measurements. From these measurements the crystal structures are determined. The full width at half maximum and integrated intensity give the fruitful information for magnetic elastic interactions.
authors.affiliation: Shahjalal University of Science and Technology, Sylhet, 3114 Bangladesh.
authors.forename: A
authors.initials: A
authors.lastname: Khan
authors.affiliation: Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192 Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kaneko
authors.affiliation: Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192 Japan.
authors.forename: H
authors.initials: H
authors.lastname: Suzuki
authors.affiliation: Shahjalal University of Science and Technology, Sylhet, 3114 Bangladesh.
authors.forename: S
authors.initials: S
authors.lastname: Naher
authors.affiliation: Shahjalal University of Science and Technology, Sylhet, 3114 Bangladesh.
authors.forename: M H
authors.initials: MH
authors.lastname: Ahsan
authors.affiliation: Shahjalal University of Science and Technology, Sylhet, 3114 Bangladesh.
authors.forename: M A
authors.initials: MA
authors.lastname: Islam
authors.affiliation: Bangladesh University of Engineering and Technology, Dhaka, 1000 Bangladesh.
authors.forename: M A
authors.initials: MA
authors.lastname: Basith
authors.affiliation: Atomic Energy Commission, Agargaon, Sher-e-Bangla Nagor, Dhaka, 1207 Bangladesh.
authors.forename: H M B
authors.initials: HMB
authors.lastname: Alam
authors.affiliation: Atomic Energy Commission, Agargaon, Sher-e-Bangla Nagor, Dhaka, 1207 Bangladesh.
authors.forename: D K
authors.initials: DK
authors.lastname: Saha
keywords: Low temperature X-ray diffraction; Magneto-structural coupling; Particle size