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Phosphorus pentoxide crystallizes in at least four forms or polymorphs.The most familiar one, a metastable form [1] (shown in the figure), comprises molecules of P 4 O 10.Weak van der Waals forces hold these molecules together in a hexagonal lattice (However, in spite of the high symmetry of the molecules, the crystal packing is not a close packing [2]).
Nanoscale hydroxyapatite crystals form a layered structure with the deposited collagen at the surface of the implant. Following these reactions, bone growth continues as the newly recruited cells continue to function and facilitate tissue growth and repair. The Bioglass implant continues to degrade and be converted to new ECM material.
A general formula for such cyclic compounds is [HPO 3] x where x = number of phosphoric units in the molecule. When metaphosphoric acids lose their hydrogens as H +, cyclic anions called metaphosphates are formed. An example of a compound with such an anion is sodium hexametaphosphate (Na 6 P 6 O 18), used as a sequestrant and a food additive.
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The compound can also be created in the gas phase by reacting nitrogen dioxide NO 2 or N 2 O 4 with ozone: [13] 2 NO 2 + O 3 → N 2 O 5 + O 2. However, the product catalyzes the rapid decomposition of ozone: [13] 2 O 3 + N 2 O 5 → 3 O 2 + N 2 O 5. Dinitrogen pentoxide is also formed when a mixture of oxygen and nitrogen is passed through an ...
Niobium pentoxide is the inorganic compound with the formula Nb 2 O 5. A colorless, insoluble, and fairly unreactive solid, it is the most widespread precursor for other compounds and materials containing niobium. It is predominantly used in alloying, with other specialized applications in capacitors, optical glasses, and the production of ...
The structure of all polymorphs of triphosphorus pentanitride was determined by single crystal X-ray diffraction. α‑ P 3 N 5 and α′‑ P 3 N 5 are formed of a network structure of PN 4 tetrahedra with 2- and 3-coordinated nitrides, [ 7 ] [ 9 ] γ‑ P 3 N 5 is composed of both PN 4 and PN 5 polyhedra [ 8 ] while δ- P 3 N 5 is composed ...
The pyrophosphate anion has the structure P 2 O 4− 7, and is an acid anhydride of phosphate. It is unstable in aqueous solution and hydrolyzes into inorganic phosphate: P 2 O 4− 7 + H 2 O → 2 HPO 2− 4. or in biologists' shorthand notation: PP i + H 2 O → 2 P i + 2 H +