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The region of homogeneity in a solid solution of the nominal composition Zn2 – 2xMn2xSiO4 (х ≤ 0.21 ± 0.01) is determined. A comparison of the values of the pycnometric and X-ray densities for the compositions with x ≥ 0.13 ± 0.01 indicates the coexistence of manganese ions in two charge states: Mn2+ and Mn3+. It is established voltammetrically that all of the manganese ions in Zn1.8Mn0.2SiO4 are...
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