Magnetic structures and one-dimensional antiferromagnetism of M2FeIIIF5 flourides (M = K, Rb, Cs)

Tantalum Aluminum Alkoxide as a Double-Metal Precursor for Metalorganic Chemical Vapor Deposition of Sr2AlTaO6

“…[4], it is written TN = 2S(S+ 1)(4J1 + 412)/3k; to determine J1, S will be given by the free-ion value. Finally J , is deduced to be around 6.3 K, a value in good agreement with determinations performed on the one-dimensional compound Rb2FeF5 [13] and on NH,FeF, [14]. Note that J1 corresponds to a mean Fe3+-F distance of 1.93 2 0.02 8, and to Fe-F-Fe angles equal to 160.9' or to 151.1' [ l , 21; the Fe3+-Fe3+ distances are 3.8 and 5.4 8, for J 1 and J2 respectively.…”

Unveiling the Local Structure of Cu2+Ions from d-Orbital Splitting. Application to K2ZnF4:Cu2+and KZnF3:Cu2+

“…A similar behavior is found for JT Mn 3+ ( 2 E ground state) and non-JT Fe 3+ ( 6 A 1 ground state) fluorides. FeF 6 3– and MnF 6 3– distortions are Q θ = 0 in Rb 2 KFeF 6 (ref ) and Q θ = 0.20 Å in Cs 2 KMnF 6 (ref ), Q θ = 0.16 Å in Na 3 MnF 6 (0D), , Q θ = 0.14 Å in Cs 2 FeF 5 (ref ) and Q θ = 0.29 Å in Na 2 MnF 5 and Tl 2 MnF 5 (1D), , and Q θ = −0.09 Å in KFeF 4 (ref ) and Q θ = 0.37 Å in CsMnF 4 (2D), , thus emphasizing the additional distortion displayed by Mn 3+ due to E ⊗ e JT coupling (Table ). A similar situation is encountered for Cu 2+ . ,,,,,,,,− …”

Face-sharing octahedra in Cs3Al2F9 and Cs2AlF5

“…Existence of Cs 2 AlF 5 , another compound of the Cs–Al–F family with yet unknown crystal structure, was for the first time mentioned by Bentrup (1991), who claimed to have prepared it by dehydration of Cs 2 [AlF 5 (H 2 O)] at 171°C. Symmetry of the cell was proposed to be orthorhombic, space group not determined, and it was concluded that “ merely the chain type of Cs 2 AlF 5 has not been determined up to now .” If assuming isostructurality with orthorhombic Rb 2 FeF 5 (Dance et al , 1980), the structure would be built of corner-sharing (AlF 6 ) 3− octahedra.…”