For exploring the interesting solvent effect on structure and morphology, a variety of MgWO₄ nanoparticles were prepared by a one-pot solvothermal method with different proportional solvents of water and ethylene glycol. The results showed that monoclinic wolframite crystalline structure of MgWO₄ was successfully synthesized, corresponding to two standard cards of MgWO₄ (JCPDS No. 27-0789) and MgWO₄ (JCPDS No. 19-0776), respectively. The morphology of MgWO₄ nanoparticles presents eight different shapes and orderly transforms from one shape to another with increasing water content in mixed EG-water solvents, and a possible mechanism was proposed. The catalytic activities of these MgWO₄ nanoparticles on the thermal decomposition of Ammonium Perchlorate (AP) were compared using differential scanning calorimetry (DSC) method, and found to present good change rule with particle size.

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