Barium pyrophosphate

Barium pyrophosphate
Barium pyrophosphate
Are common
Systematic ; name	Barium pyrophosphate
Traditional names	Barium phosphate, pyro
Chem. formula	Ba 2 P 2 O 7
Physical properties
condition	colorless crystals
Molar mass	442.62 g / mol
Density	3.91 g / cm³
Thermal properties
T. melt.	1430 ° C
Chemical properties
Water solubility	0,0088 g / 100 ml
Classification
Reg. CAS number	13466-21-2

Barium pyrophosphate is an inorganic compound, a salt of barium metal and diphosphoric acid with the formula Ba ₂ P ₂ O ₇ , colorless crystals, does not dissolve in water, forms crystalline hydrates .

Content

Getting

Heating of barium hydrogen phosphate ^[1] :

{\mathsf {2BaHPO_{4}\ {\xrightarrow {T}}\ Ba_{2}P_{2}O_{7}+H_{2}O}}

{\ displaystyle {\ mathsf {2BaHPO_ {4} \ {\ xrightarrow {T}} \ Ba_ {2} P_ {2} O_ {7} + H_ {2} O}}}

The exchange reaction of rastable barium salts and diphosphoric acid ^[1] :

{\mathsf {2BaCl_{2}+H_{4}P_{2}O_{7}\ {\xrightarrow {}}\ Ba_{2}P_{2}O_{7}\downarrow +2HCl}}

{\ displaystyle {\ mathsf {2BaCl_ {2} + H_ {4} P_ {2} O_ {7} \ {\ xrightarrow {}} \ Ba_ {2} P_ {2} O_ {7} \ downarrow + 2HCl}} }

Physical Properties

Barium pyrophosphate forms crystals of several modifications ^[1] :

α-Ba ₂ P ₂ O ₇ , orthorhombic syngony , space group P nma , cell parameters a = 0.92842 nm , b = 0.56113 nm , c = 1.3796 nm , Z = 4 ^[2] , is formed when temperature ( hydrothermal synthesis );
β-Ba ₂ P ₂ O ₇ , formed at low temperature;
δ-Ba ₂ P ₂ O ₇ , formed during the dehydration of the crystalline hydrate.

Forms crystalline hydrate of the composition Ba ₂ P ₂ O ₇ • 2.35 H ₂ O ^[3] .

Application

Titanium-activated barium pyrophosphate is used as a phosphor in fluorescent lamps emitting broadband blue light ^[1] .

Notes

² ¹ ² ³ ⁴ Richard C. Ropp ,. Encyclopedia of the Alkaline Earth Compounds. - Elsevier, 2013. - 1187 p. - ISBN 978-0-444-59550-8 .
↑ Carla Heyward, Matthew Mann, Joseph Kolis. Hydrothermally synthesized α-Ba ₂ P ₂ O ₇ // Acta Crystallogr Sect. E. - 2010. - Vol. 66 , No. 12 . - S. i84 . - DOI : 10.1107 / S1600536810043527 .
↑ VV Kokhanovskiǐ. δ-Ba ₂ P ₂ O ₇ crystallization during Ba ₂ P ₂ O ₇ · 2.35H ₂ O thermal dehydration // Russian Journal of Inorganic Chemistry. - 2004. - Vol. 49 , No. 3 . - p . 459-465 .

Literature

Chemist Handbook / Redkol .: Nikolsky B.P. et al. - 3rd ed., Rev. - L .: Chemistry, 1971. - T. 2. - 1168 p.

[Ropp-1] ² ¹ ² ³ ⁴ Richard C. Ropp ,. Encyclopedia of the Alkaline Earth Compounds. - Elsevier, 2013. - 1187 p. - ISBN 978-0-444-59550-8 .

[2] Carla Heyward, Matthew Mann, Joseph Kolis. Hydrothermally synthesized α-Ba ₂ P ₂ O ₇ // Acta Crystallogr Sect. E. - 2010. - Vol. 66 , No. 12 . - S. i84 . - DOI : 10.1107 / S1600536810043527 .

[3] VV Kokhanovskiǐ. δ-Ba ₂ P ₂ O ₇ crystallization during Ba ₂ P ₂ O ₇ · 2.35H ₂ O thermal dehydration // Russian Journal of Inorganic Chemistry. - 2004. - Vol. 49 , No. 3 . - p . 459-465 .

Barium pyrophosphate
Are common
Systematic name	Barium pyrophosphate
Traditional names	Barium phosphate, pyro
Chem. formula	Ba ₂ P ₂ O ₇
Physical properties
condition	colorless crystals
Molar mass	442.62 g / mol
Density	3.91 g / cm³
Thermal properties
T. melt.	1430 ° C
Chemical properties
Water solubility	0,0088 g / 100 ml
Classification
Reg. CAS number	13466-21-2