Considering when most of different atoms combine together , the covalent bond and the electrovalent bond are concomitant
2.
( c ) the total energy of manganate - oxides materials decreases after intercalation lithium . the electrovalent bond weakens and the covalent bond strengthen between manganese and oxygen due to ion polarization effect , which makes the spinel structure more stable
3.
By home analyzing the experiment result , we think that the covalent bond is more than the electrovalent bond in y - fe _ ( 2 ) o _ ( 3 ) crystallites . it is the dominating reason that the dependence of y - fe _ ( 2 ) o _ ( 3 ) crystallites grin size on lattice constant is differ from one of the ionic crystallites
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