21031-92-5

Usage

InChI:InChI=1/FH.O.Tb/h1H;;/q;-2;+3/p-1

Upstream product

• 13708-63-9 terbium(III) fluoride 
• 7732-18-5 water 
• 116-14-3 polytetrafluoroethylene 
• 36781-15-4 terbium tetrafluoride 

Relevant academic research and scientific papers

Synthesis, crystal structure and properties of novel isostructural two-dimensional lanthanide-based coordination polymers with 2,3,5,6-tetrafluoro- 1,4-benzenedicarboxylic acid

Five new isostructural two-dimensional lanthanide-based coordination polymers with the formula Ln2(F4BDC)3(DEF) 2(EtOH)2-2(DEF) (Ln = Tb, 1; Gd, 2; Eu, 3; La, 4; Nd, 5; F4BDC2- =

On the rhombohedral-cubic phase transition of solid solutions ROF-CaF2 with R=Gd, Tb and Dy

The rhombohedral-cubic phase transition typical of stoichiometric rare earth oxide fluorides of the formula type ROF was investigated for the ROF-based solid solution systems R1-xCaxO1-xF1+x, with R=Gd, Tb, Dy, by differential scanning calorimetry and by X-ray powder diffraction. It was found that the solubility limit of CaF2 in these ROF is almost identical with x 2 content. At x≈0.9 this decrease is approximately 290 K, 250 K and 240 K for R=Gd, Tb and Dy, respectively, as compared to the transition temperatures of pure ROF. The formula volumes of the rhombohedral as well as the cubic solid solutions were determined as a function of x, and the structural implications of the observed trend is discussed for the rhombohedral modification, A partial tentative phase diagram is exemplarily proposed for Gd1-xCaxO1-xF1+x.

Low temperature synthesis of LnOF rare-earth oxyfluorides through reaction of the oxides with PTFE

A low temperature solid-state synthesis route, employing polytetrafluoroethylene (PTFE) and the rare-earth oxides, for the formation of the LnOF rare-earth oxyfluorides (Ln = Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er), is reported. With the exception of LaOF, which forms in a tetragonal variant, rhomobohedral LnOF is found to be the major product of the reaction. In the case of PrOF, a transition from the rhombohedral to the cubic fluorite phase is observed on heating in air to 500 °C. X-ray diffraction shows the expected lanthanide contraction in the lattice parameters and bond lengths. Magnetic susceptibility measurements show antiferromagnetic-like ordering in TbOF, Tm = 10 K, with a metamagnetic transition at a field μ0Ht = 1.8 T at 2 K. An antiferromagnetic transition, TN = 4 K, is observed in GdOF. Paramagnetic behavior is observed above 2 K in PrOF, NdOF, DyOF, HoOF and ErOF. The magnetic susceptibility of EuOF is characteristic of Van Vleck paramagnetism.

Synthesis and Study of Gadolinium(III), Terbium(III), and Dysprosium(III) Trifluoroacetate Trihydrates

Gadolinium(III), terbium(III), and dysprosium(III) trifluoroacetate and pentafluoroacetate trihydrates were synthesized, and their magnetic properties were studied. Thermolysis of these compounds in the range 250-350°C produces corresponding triflurohydrides of the lanthanides.

Thermodynamics of the rhombohedral-cubic phase transition of ROF with R=Y, La, Pr, Nd, Sm-Er

The temperatures and enthalpies of the rhombohedral-cubic phase transition of stoichiometric ROF with R=Y, La, Pr, Nd, Sm-Er, have been determined by differential scanning calorimetry. The temperatures of transition are found in the range 742-880 K in sat

Phase analyses of lanthanide oxide fluorides

Approximate composition limits and lattice parameters of the rhombohedral and tetragonal phases observed in the system LnO1-xF1+2x (Ln = Nd, Gd, Er) are reported. Variation of the c/a ratio of the tetragonal phase with atomic number is noted and discussed. The rhombohedral to cubic transition temperatures of LnO1-xF1+2x (Ln = La, Nd, Sm, Eu, Gd, Tb, Dy, Y, Ho, and Er) determined from differential thermal analysis are reported and the transition is discussed. Thermal expansion data are reported for NdOF and its mode of thermal decomposition is indicated.