Abstract
The effects of high-energy ball milling and subsequent calcinations on the mixture of MgO and Nb 2O 5 were investigated. It was found that the formation temperature of the single-phase Mg 4Nb 2O 9 powders had a consanguineous connection with milling time, calcinations temperature and dwell time. With increasing milling time, calcinations temperature and dwell time, the qualitative concentration of Mg 4Nb 2O 9 phase increased. Pure Mg 4Nb 2O 9 nanopowders with average particle size of 72.5 nm were primary synthesized at 900 °C for 3 h from 60 h powders. The Mg 4Nb 2O 9 ceramics with almost full density and an excellent microwave dielectric properties ( ɛ r = 12.6, Q × f = 175,810 GHz) were obtained after annealing at 1200 °C from the milled 60 h powders.
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