EPR Spectra of Double Molybdates and Tungstates Undergoing Ferroelastic Phase Transitions

Coexistance of spiral and commensurate structures in a triangular antiferromagnet KFe(MoO4)2

“…The anticipated displacement of K-ions, resulting in the period doubling and symmetry lowering is presented following Ref. [8] in Figure1. The group C 3 2h enables nonequivalent adjacent magnetic layers.…”

Vibrational Characteristics of the Alkali Metal–Indium Double MolybdatesMIn(MoO4)2and TungstatesMIn(WO4)2(M=Li, Na, K, Cs)

“…It was possible to freeze this high-temperature phase down to room temperature by putting hot sample into the water (13). Later, a new phase transition was discovered in the trigonal phase at the temperature 181°C (14,15). This ferroelastic phase transition has been a subject of many EPR and crystallographic studies (16)(17)(18)(19).…”

“…Later, a new phase transition was discovered in the trigonal phase at the temperature 181°C (14,15). This ferroelastic phase transition has been a subject of many EPR and crystallographic studies (16)(17)(18)(19). It was shown that the structure below 181°C is monoclinic (C2/c"C F , a" 10.11, b"5.78, c"14.49, "90.33° (15)).…”

Optical properties of chromium(III) in MIIn(MoO4)2hosts, where MI= Li, Na, K, Rb, Cs

“…The absorption spectra of MIn(MoO 4 ) 2 (M = Na, K) were measured at low and room temperature (see figure 1). They are always composed of three broad bands (with halfwidth ≈ 120 nm) which are due to the spin-allowed transitions: 4 A 2 → 4 T 2 (λ max ≈ 740.4 nm and λ max ≈ 721.2 nm for NaIn(MoO 4 ) 2 and KIn(MoO 4 ) 2 crystal, respectively), 4 A 2 → 4 T 1 (F) (λ max ≈ 500 nm and λ max ≈ 493.5 nm, respectively) and 4 A 2 → 4 T 1 (P) (λ max ≈ 368 nm and λ max ≈ 370 nm, respectively). The splitting due to the low symmetry and spin-orbit coupling of the quartet levels becomes apparent from the asymmetric shape of the bands and the presence of pronounced shoulders (see for example the 4 A 2 → 4 T 1 (F) band).…”

“…Double molybdates of the M I M III (MoO 4 ) 2 family are very important compounds because of their optical, antiferroelectric and ferroelastic properties [1][2][3][4][5][6][7][8][9]. They are suitable hosts for transition-metal and lanthanide ions [10][11][12].…”