Study of Formation of Iron Compounds and Color Tone on Bizen Stoneware

研究了在以红松为燃料的多室攀登窑中加热的Bizen石器上褐色花纹的形成阶段和微观结构。发现主晶相为尖晶石相，以Mg(Al，Fe)_2O_4表示。此外，我们还发现，尖晶石相是由红松提供的镁组分与碧森粘土反应形成的。我们成功地将名义组成为Mg：Al：Fe=1：2-x：x(x=0.5-1.5)的氧化镁、氧化铁和氧化铝的混合物涂在比赞球上，然后在1250℃的空气中加热，成功地制备了棕黄色图案。

Formation phase and microstructure of brownish color pattern on Bizen stoneware heated in a noborigama(multi chambered climbing kiln) with red pine as a fuel was studied. The main crystalline phase in this pattern was found to be a spinel phase expressed as Mg(Al, Fe)_2O_4. Moreover, we found that the spinel phase was formed by a reaction between a Mg component supplied from red pine and Bizen clay. We succeeded in preparation of the brownish color pattern by painting a mixture of MgO, Fe_2O_3 and Al_2O_3 with a nominal composition of Mg : Al : Fe=1 : 2-x : x(x=0.50-1.50) on Bizen pellets, and then heating at 1250℃in air.