Study on the synthetic FeWO_4 - MnWO_4 series minerals

FeWO_4 (ferberite) and MnWO_4 (huebnerite) series minerals have a continuous solid solution. The solid solution (wolframite) were synthesized by dry method at 800℃ in Nitrogen gas. The synthetic wolframites are aggregate of prismatic crystal and their colors are varying with the composition of their Fe contents from yellow to reddish brown. X-ray powder diffraction (Table 1) data for synthetic wolframite are examined by Guinier method and unit cell parameters (Table 2) obtained by a least squares calculation. These values (Figure 1) increased linearly with increasing Mn contents (Figure 1). The results similar to those of previous studies but have more linearity.

ferberite

huebnerite

wolframite

FeWO4 - MnWO4 series

XRD

variation of cell parameters