Aluminum metaphosphate

Crystal structure
	Structure of tetragonal aluminum metaphosphate ; __ Al 3+ __ P 5+ __ O 2−
General
Surname	Aluminum metaphosphate
Ratio formula	Al (PO 3 ) 3
Brief description	colorless powder
External identifiers / databases
EC number	237-415-3
ECHA InfoCard	100,034,000
Wikidata	Q447714
properties
Molar mass	263.90 g mol −1
Physical state	firmly
density	2.78 g cm −3 (25 ° C)
solubility	almost insoluble in water
safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 315-319-335
	P: 261-305 + 351 + 338
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

The aluminum metaphosphate ( molecular formula Al (PO ₃ ) ₃ ) is a chemical compound , which in the solid state of aggregation in the form of tetragonal or monoclinic present crystals. Tetragonal Al (PO ₃ ) ₃ contains tetrameric anions (PO ₃ ) ₄⁴⁻ . The monoclinic form contains infinite chains of corner-linked tetrahedra.

properties

It is insoluble in bases and acids as well as in water. Its density differs from that of the ortho type and is 2.78 g · cm ⁻³ .

synthesis

The metaphosphate can be prepared from aluminum hydroxide with orthophosphoric acid at around 300 ° C.

{\ displaystyle \ mathrm {Al (OH) _ {3} +3 \ H_ {3} PO_ {4} \ longrightarrow Al (PO_ {3}) _ {3} +6 \ H_ {2} O}}

use

Aluminum metaphosphate is a component of glazes , enamels , glasses , temperature-resistant insulating compounds and molecular sieves .

Individual evidence

↑ ^a ^b ^c ^d ^e Entry on aluminum metaphosphate in the GESTIS substance database of the IFA , accessed on February 14, 2017(JavaScript required) .
^ L. Pauling, J. Sherman: The crystal structure of aluminum metaphosphate Al (PO ₃ ) ₃ . In: Zeitschrift für Kristallographie, Kristallgeometrie, Kristallphysik, Kristallchemie , 1937 , 96 , pp. 481-487.
↑ H. van der Meer: Crystal structure of a monoclinic form of aluminum metaphosphate, Al (PO ₃ ) ₃ . In: Acta Crystallographica , 1976 , B32 , pp. 2423-2426.
↑ Entry on aluminum phosphates. In: Römpp Online . Georg Thieme Verlag, accessed on July 14, 2014.

[GESTIS-1] Entry on aluminum metaphosphate in the GESTIS substance database of the IFA , accessed on February 14, 2017(JavaScript required) .

[2] L. Pauling, J. Sherman: The crystal structure of aluminum metaphosphate Al (PO ₃ ) ₃ . In: Zeitschrift für Kristallographie, Kristallgeometrie, Kristallphysik, Kristallchemie , 1937 , 96 , pp. 481-487.

[3] H. van der Meer: Crystal structure of a monoclinic form of aluminum metaphosphate, Al (PO ₃ ) ₃ . In: Acta Crystallographica , 1976 , B32 , pp. 2423-2426.

[4] Entry on aluminum phosphates. In: Römpp Online . Georg Thieme Verlag, accessed on July 14, 2014.