37362-95-1

Basic information

• Product Name: Scandium trifluoride
• Synonyms: Einecs 237-255-4
• CAS NO: 37362-95-1
• Molecular Weight: 0
• Mol File: 37362-95-1.mol

Chemical Properties

• Appearance: /
• CAS DataBase Reference: Scandium trifluoride(CAS DataBase Reference)
• NIST Chemistry Reference: Scandium trifluoride(37362-95-1)
• EPA Substance Registry System: Scandium trifluoride(37362-95-1)

Safety Data

• Hazardous Substances Data: 37362-95-1(Hazardous Substances Data)

Upstream product

• 7664-39-3 hydrogen fluoride 
• 7790-79-6 cadmium(II) fluoride 
• 1279123-63-5 potassium hydrogenfluoride 
• 12775-96-1 copper 
• 10361-84-9 scandium(III) chloride 
• 7789-23-3 potassium fluoride 
• 7681-49-4 sodium fluoride 
• 13709-36-9 xenon difluoride 
• 16984-48-8 fluoride 
• 22537-40-2 yttrium(III) 
• 16961-83-4 fluorosilicic acid 

Downstream Products

• 36781-15-4 terbium tetrafluoride 

Relevant articles and documents

Interface-Assisted Synthesis of Single-Crystalline ScF3 Microtubes

Scandium fluoride (ScF3) microtubes with nanoscale wall thickness were for the first time successfully synthesized by an interface-assisted technique at the surface of a scandium nitrate aqueous solution without the addition of any surfactant as a result of interaction with hydrofluoric acid from the gaseous phase in only 30 min. X-ray diffraction analysis, scanning electron microscopy, helium ionic microscopy, transmission electron microscopy (TEM), and high-resolution TEM (HRTEM) were used to examine the morphology and crystal structure of ScF3 microtubes. The results show that the ScF3 microtube is single-crystalline and has a hexagonal structure. A hypothetical model of thin-walled microtube formation is proposed.

Isotropic Zero Thermal Expansion and Local Vibrational Dynamics in (Sc,Fe)F3

Scandium fluoride (ScF3) exhibits a pronounced negative thermal expansion (NTE), which can be suppressed and ultimately transformed into an isotropic zero thermal expansion (ZTE) by partially substituting Sc with Fe in (Sc0.8Fe0.2)F3 (Fe20). The latter displays a rather small coefficient of thermal expansion of -0.17 × 10-6/K from 300 to 700 K. Synchrotron X-ray and neutron pair distribution functions confirm that the Sc/Fe-F bond has positive thermal expansion (PTE). Local vibrational dynamics based on extended X-ray absorption fine structure indicates a decreased anisotropy of relative vibration in the Sc/Fe-F bond. Combined analysis proposes a delicate balance between the counteracting effects of the chemical bond PTE and NTE from transverse vibration. The present study extends the scope of isotropic ZTE compounds and, more significantly, provides a complete local vibrational dynamics to shed light on the ZTE mechanism in chemically tailored NTE compounds.

Large-scale synthesis of isotropic single-crystalline ScF 3 cubes by hydrothermal method

Scandium fluoride (ScF3) belongs to one of the rare compounds which exhibit isotropic negative thermal expansion. Here, a facile and environmentally friendly hydrothermal synthesis method has been presented. High-quality single-crystalline ScF3 cubes, with an average size of 200 nm, can be easily fabricated in a large scale. Sc(NO3) 3 and NH4HF2 were used as precursors. The as-prepared ScF3 demonstrates cubic symmetry (Pm-3 m), which was confirmed by X-ray diffraction and selected-area electron diffraction. Its uniform morphology and size were characterized by high-resolution transmission electron microscopy. Furthermore, thermal analysis was also performed in argon gas atmosphere to investigate its thermal stability.

Soft chemistry synthesis of powders in the BaF2-ScF3 system

The BaF2-ScF3 system is studied using coprecipitation from aqueous solutions. Compound Ba3Sc2F12 is found to form over a wide range (10-60 mol %) of scandium concentrations in the initial solution. At higher scandium concentrations in solution, a new phase of provisional composition BaSc2F8 · 2H2O (hexagonal system, a = 9.6346 A?, c = 4.0483 A?) was obtained. Scandium fluoride hydrolysis is not observed by energy-dispersive X-ray analysis.

Synthesis and characterization of new hydroxylammonium fluoromanganates and fluoroscandates

New hydroxylammonium fluorometallates of manganese and scandium, with the formulas (NH3OH)2MnF4and (NH3OH)3ScF6, were prepared by the reactions of hydroxylammonium fluoride with solutions of manganese or scandium in aqueous HF. (NH3OH)2MnF4crystallizes monoclinic, P21/c, the structure consisting of MnF6octahedra sharing four of its vertices, resulting in [MnF42-]nanionic layers perpendicular to a axis. (NH3OH)3ScF6crystallizes trigonal, R3c, and the structure is made up of isolated ScF6octahedra, stacked in columns along c axis and surrounded by a cylinder of hydroxylammonium cations. Both title compounds decompose during thermal analysis in several steps, yielding corresponding fluorides (MnF2and ScF3) at temperatures between 300 and 400 °C and oxides/oxofluorides at higher temperatures.

Synthesis and characterization of new hydroxylammonium fluoromanganates and fluoroscandates

New hydroxylammonium fluorometallates of manganese and scandium, with the formulas (NH3OH)2MnF4 and (NH 3OH)3ScF6, were prepared by the reactions of hydroxylammonium fluoride with solutions of manganese or scandium in aqueous HF. (NH3OH)2MnF4 crystallizes monoclinic, P2 1/c, the structure consisting of MnF6 octahedra sharing four of its vertices, resulting in [MnF42-]n anionic layers perpendicular to a axis. (NH3OH)3ScF 6 crystallizes trigonal, R3c, and the structure is made up of isolated ScF6 octahedra, stacked in columns along c axis and surrounded by a cylinder of hydroxylammonium cations. Both title compounds decompose during thermal analysis in several steps, yielding corresponding fluorides (MnF2 and ScF3) at temperatures between 300 and 400 °C and oxides/oxofluorides at higher temperatures.

Preparation and examination of the properties of complex scandium fluorides

Precipitation of scandium with sodium fluoride from an ammonium hydrogen difluoride solution was examined at the molar ratios of Na to Sc within 1-14 and different initial concentrations of scandium in solution. The composition of the resulting precipitate was determined by X-ray phase analysis method. The solubility of the scandium compounds synthesized was examined. Pleiades Publishing, Ltd., 2011.

Ammonium scandium tetrafluoride

The title compound, NH4ScF4, is an addition to the AMF4 family of layered perovskite-like structures. The structure consists of a two-dimensional array of corner-sharing ScF6 octahedra, which produces anionic sheets of stoichiometry [ScF4]- stacked along the c axis. The layers are separated by charge-balancing ammonium cations, which hydrogen bond to the apical F atoms of adjacent layers. This structure may be viewed as a 'single-layer' fluoride analogue of the Dion-Jacobson family of oxides.

Syntheses and structures of Li3ScF6 and high pressure LiScF4-, luminescence properties of LiScF4, a new phase in the system LiF-ScF3

Colorless single crystals of Li3ScF6 have been prepared by reacting the binary components LiF and ScF3 at 820°C for 16 h in argon atmosphere. This complex fluoride is the only stable phase in the system LiF-ScF3 under ambient pressure. According to a structure refinement based on single crystal X-ray diffraction data it crystallizes in the centrosymmetric space group P3c1 with a=8.78.3(1)A and c=9.518(1)A. The new structure of Li3ScF6 is a filled variant of the Na2GeF6 type structure and can be described in terms of a hexagonal close packing of fluorine in which 2/3 of the octahedral holes are occupied by Sc and Li. High pressure/high temperature studies of the system LiF-ScF3 show that the new phase LiScF 4 is formed at around 5.5 GPa and 575°C. According to Rietveld refinements of powder X-ray diffraction data LiScF4 adopts the Scheelite type structure (space group I41/a) with a=4.980(1)A and c=10.074(1)A. A sample of LiScF4 doped with 1% Er exhibits an intense luminescence in the far IR region.

Action of Ammonium Fluoride on Scandium: Synthesis and Crystal Structures of (NH4)3[ScF6] and [Cu(NH3)4]3[ScF6]2

The action of (NH4)F on scandium in copper ampoules yields either (NH4)3[ScF6] or ScF3 and a small quantity of [Cu(NH3)4]3[ScF6]2, respectively,depending upon the molar ratio of the educts (NH4)F:Sc (6:1 and 4:1, re spectively) and temperature. (NH4)3[ScF6] crystallizes with the cryolitetype of structure: monoclinic, P21/n, Z=2; a=650.0(2); b=651.4(2); c=94 9.0(2) pm; β=90.40(2)°, [Cu(NH3)4]3[ScF6]2 is triclinic, P-1, Z=1; a=821.1(2); b=821.2(2); c=822.7(2) pm; α=90.04(3); β=90.00(3); γ=90.16(3)°. In its chemical behaviour against (NH4)F, scandium parallels aluminium rather than gallium.