14484-69-6

Basic information

• Product Name: Potassium fluoroaluminate
• Synonyms: POTASSIUM CRYOLITE;POTASSIUM HEXAFLUOROALUMINATE;POTASSIUMALUMINIUMTETRAFLUORIDE;Potassium fluoroaluminate;potassmm aluminium fluoride;Potassium fluoroalum;PotassiuM fluoaluMinate;Aluminate(1-), tetrafluoro-, potassium, (T-4)-
• CAS NO: 14484-69-6
• Molecular Formula: AlF₄*K
• Molecular Weight: 142.07
• EINECS: 238-485-8
• Product Categories: Fluoride
• Mol File: 14484-69-6.mol
• Article Data: 5

Chemical Properties

• Melting Point: 546 °C
• Appearance: solid
• Density: 2.9[at 20℃]
• Water Solubility: 2.5g/L at 20℃
• Stability: Stable. Incompatible with strong oxidizing agents. May be moisture sensitive.
• CAS DataBase Reference: Potassium fluoroaluminate(CAS DataBase Reference)
• NIST Chemistry Reference: Potassium fluoroaluminate(14484-69-6)
• EPA Substance Registry System: Potassium fluoroaluminate(14484-69-6)

Safety Data

• Hazard Codes: Xi
• Statements: 31-36/37/38
• Safety Statements: 22-26-36/37/39-45
• WGK Germany: 1
• Hazardous Substances Data: 14484-69-6(Hazardous Substances Data)

Usage

Uses

Potassium fluoroaluminate is a useful research chemical compound.

Chemical Properties

solid

Flammability and Explosibility

Nonflammable

InChI:InChI=1/Al.FH.K/h;1H;/q+3;;+1/p-1

Synthetic route

potassium hexafluorosilicate + aluminium oxide → potassium tetrafluoroaluminate (14484-69-6) + tripotassium hexafluoroaluminate

Conditions	Yield
In solid at 500°C;

potassium hexafluorosilicate + corundum → potassium tetrafluoroaluminate (14484-69-6) + tripotassium hexafluoroaluminate + kalsilite

Conditions	Yield
In solid thermal decompn.;

aluminum trihydroxide + hydrogen fluoride (7664-39-3) + potassium carbonate (584-08-7) → potassium tetrafluoroaluminate (14484-69-6)

Conditions	Yield
In water reacting mixt. of K2CO3 in soln. with specified amt. of Al(OH)3, acidifying with excess aq. HF, drying at 100°C, annealing for 48 h; DTA anal., X-ray diffraction anal.;

aluminum oxide (1333-84-2, 1344-28-1) + potassium tetrafluoroborate (14075-53-7) → potassium tetrafluoroaluminate (14484-69-6) + tripotassium hexafluoroaluminate

Conditions	Yield
In neat (no solvent) heating (600°C, molar ratio KBF4/Al2O3 3:1 or 6:1), isothermal treatment ( 1-5 h); thermogravimetry; X-ray diffraction;

aluminum oxide (1333-84-2, 1344-28-1) + potassium tetrafluoroborate (14075-53-7) → potassium tetrafluoroaluminate (14484-69-6)

Conditions	Yield
In neat (no solvent) heating (475-600°C, molar ratio KBF4/Al2O3 2:1, 3:1 or 6:1), isothermal treatment ( 1-5 h); thermogravimetry; X-ray diffraction;

aluminum(III) fluoride (7784-18-1) + potassium fluoride dihydrate → potassium tetrafluoroaluminate (14484-69-6)

Conditions	Yield
In neat (no solvent) heating (to 400°C), isothermal treatment (0.5 h);
In water addn. of stoichiometric amt. of KF*2H2O dissolved in little H2O to AlF3(prepared from Al2O3 and 48% HF), pptn., soln. and solid digested for 1h on a steam bath; decanted, precipitate dried (open muffle furnace at 378K), fused at 933K in vitreosil crucible for 15-20min, melt cooled in desiccator;

potassium hexafluorozirconate + aluminium (7429-90-5) → potassium tetrafluoroaluminate (14484-69-6) + tripotassium hexafluoroaluminate + Al3Zr

Conditions	Yield
In neat (no solvent) Al and K2ZrF6 powders mixed (stoich. ratio), heated (air or vac., 700°C.); X-ray diffraction anal.;

potassium tetrafluoroborate (14075-53-7) + aluminium (7429-90-5) → potassium tetrafluoroaluminate (14484-69-6)

Conditions	Yield
byproducts: B; ground, mixed; evacuated (1E-2 mmHg); 200-500°C, 5-6 h; B isolated by washing (HCl, H2SO4, room temp.);

2K(1+)*H(1+)*AlF6(3-) = K2HAlF6 → potassium tetrafluoroaluminate (14484-69-6)

Conditions	Yield
In neat (no solvent, solid phase) byproducts: HF, H2O; heating at 400°C; X-ray diffraction, IR, elem. anal.;

potassium oxonium hexafluoroaluminate → potassium tetrafluoroaluminate (14484-69-6)

Conditions	Yield
In neat (no solvent) byproducts: H2O, HF; thermal decompn. at 85 - 210°C (at 85 - 140°C loss of 2 mol HF and 1,5 mol H2O, at higer temp. loss of 0.5 mol H2O);

potassium tetrafluoroaluminate hemihydrate → potassium tetrafluoroaluminate (14484-69-6)

Conditions	Yield
In neat (no solvent) byproducts: H2O; thermal decompn. 140 - 210°C;

potassium hexafluorosilicate + alumina → potassium tetrafluoroaluminate (14484-69-6) + tripotassium hexafluoroaluminate

Conditions	Yield
In solid at 500°C;

aluminum(III) fluoride + potassium fluoride → potassium tetrafluoroaluminate (14484-69-6)

Conditions	Yield
at 580℃; for 1h; Inert atmosphere;

potassium tetrafluoroaluminate (14484-69-6) → tripotassium hexafluoroaluminate

Conditions	Yield
With air In neat (no solvent, solid phase) byproducts: Al2O3; heating at 500°C; X-ray diffraction, IR;

potassium tetrafluoroaluminate (14484-69-6) + antimony pentafluoride (7783-70-2) → aluminum(III) fluoride (7784-18-1) + K(1+)*Sb2F11(1-) = KSb2F11 (771495-80-8)

Conditions	Yield
In hydrogen fluoride HF (liquid); 298 K;

Upstream product

• 7664-39-3 hydrogen fluoride 
• 584-08-7 potassium carbonate 
• 1333-84-2 aluminum oxide 
• 14075-53-7 potassium tetrafluoroborate 
• 7784-18-1 aluminum(III) fluoride 
• 7429-90-5 aluminium 
• 7789-23-3 potassium fluoride 
• 7783-61-1 silicon tetrafluoride 

Downstream Products

• 7784-18-1 aluminum(III) fluoride 
• 771495-80-8 K⁽¹⁺⁾*Sb₂F₁₁^(1-) = KSb₂F₁₁ 

Relevant articles and documents

A calorimetric investigation of polymorphism in a layered perovskite: KAlF4

The heat capacity from 15 to 365 K of the layered perovskite KAlF4 is reported.On warming, a large thermal anomaly is observed at about 340 K, and the thermal history of the sample was found to have a major effect on the temperature, enthalpy, and complexity of the phase transition.D.s.c. results indicate that the phase transition on warming at 340 K is the high-temperature counterpart of the transition that had been previously reported at 250 K on cooling, and that the 250 K transformation is the stable transition.No further phase transitions are found in KAlF4 in the temperature region from 15 to 365 K.

Investigation of the systems KAlF4-KBe2F5 and K3AlF6-KBe2F5

Phase relations in the systems KA1F4-KBe2F5 and K3A1F6-KBe2F5 have been investigated by DTA and XRD methods. The KA1F4-KBe2F5 is a simple eutectic system with the eutectic point at a composition of 80.0 mol% KBe2F5 at 335 °C. For the later system, two incongruent compounds 2K3A1F6·KBe2F5 and K3A1F6·KBe2F5 melting at 448 and 378 °C, respectively were confirmed. They have been XRD indexed as both orthorhombic cells with cell parameters a = 10.70±0.01, b = 10.36±0.01, c = 5.85±0.02 A? for the former and a = 10.499±0.003, b = 9.685±0.005, c = 7.554±0.005 A? for the later. One eutectic point located at 85.0 mol% KBe2F5 at 336 °C was also observed. (C) 2000 Elsevier Science B.V.