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 _    _    _    _               _____      _____  
| \  / || | || | ||   ____     |  ___||   / ___// 
|  \/  || | || | ||  |    \\   | ||__     \___ \\ 
| .  . || | \\_/ ||  | [] ||   | ||__     /    // 
|_|\/|_||  \____//   |  __//   |_____||  /____//  
`-`  `-`    `---`    |_|`-`    `-----`  `-----`   
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Text this: Spinel manganese ferrites for oxygen electrocatalysis : effect of Mn valency and occupation site