| http://www.w3.org/ns/prov#value | - Examples of M in the aforementioned general formula (2) include alkali metals such as lithium, sodium, and potassium; alkaline earth metals such as magnesium, calcium, strontium, and barium; transition metals such as iron, cobalt, nickel, titanium, and zinc; and typical elements of group 14 of the periodic table such as aluminum, and of these, aluminum is preferred.
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