Patent ID: 11881579
Assignee: BROWN UNIVERSITY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC C  H

Claim 0:
1. A composition comprising a material having an alluaudite crystal structure;
wherein the alluaudite crystal structure is made by a method comprising the steps of:
(1) dissolving reactants (A) (NH4)2Fe(SO4)2-6H2O, (B) H3PO4, and (C) NaOH in water with a 1:1:3 molar ratio (A:B:C), thereby forming a cathode solution; and
(2) heating the cathode solution, whereby said reactants crystallize in a monoclinic C 2/c space group consisting of pure alluaudite crystal; and
wherein the alluaudite crystal structure comprises formula (I):

Na1.702Fey(PO4)z  (formula I);

wherein y is greater than or equal to 3 and less than or equal to 3.5, and wherein z is greater than or equal to 1 and less than or equal to 3.