The sintering behavior of diopside nano–sized powder was studied. We successfully fabricated diopside nano–sized powders from naturally occurring diopside single crystal (Ca_(0.92)Na_(0.07)Mn_(0.01)Mg_(0.93)Fe_(0.01)Al_(0.06)Si_(2)O_(6)). Diopside polycrystalline is sintered from powders with an average particle size of <100 nm under argon flow at temperatures ranging from 1130–1280 °C for 0.5–20 h. The average grain size increased with increasing sintering time and sintering temperature while porosity remained nearly constant value of 3–4 vol%. The experimental data of grain growth at 1180 °C can be fit for the following equation G~(3) ? G_(0)~(3) = kt , where G is the grain size after time t , G_(0) is the grain size at t = 0, and k is a rate constant.
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