Ga_2O_3-Nd_2O_3系の高温状態図

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The liquidus and eutectic temperatures in the system Ga_20_3-Nd_20_3 were measured from the cooling curves by the specular reflection method with a heliostat-type solar furnace. Quenched specimens from the melt were examined by X-ray diffractometry and chemical analysis. Four types of binary compounds were found to exist; garnet-type 3 Nd_20_3・ 5Ga_20_3, perovskite-type NdGa0_3, monoclinic 2Nd_20_3・Ga_20_3 and orthorhombic 3 Nd_20_3, Ga_20_3, Except 3 Nd_20_3, Ga_20_3, these binary compounds, showed no phase transition during repeated heating and cooling cycles. However, 3 Nd_2O_3・ Ga_20_3 decomposed to Nd_20_3 and 2 Nd_20_3, Ga_20_3 at about 1500℃, which was detected with a high-temperature X-ray diffractometer. The lattice parameters. of each compound are as follows; a_0= 12.504Å for 3 Nd_20_3・5 Ga_20_3, a_0= 5.411Å,b_0= 5.490Å, c_0= 7.708Å for NdG_a0_3, a_0=7.739Å, b_0=10.899Å, c_0=11.562Å, β=108.901 for 2Nd_20_3・Ga_20_3 and a_0=11.537Å b_0= 5.573Å, c_0=9.182 Å for 3 Nd_20_3・Ga_20_3. The solidification points of 3 Nd_20_3・5 Ga_20_3, NdGa0_3 and 2 Nd_20_8・Ga_20_3 are measured as 1640±20℃, 1670±20℃ and 1704±20℃, respectively. The phase diagram shows eutectic points with the composition of 25, 45, 58 and 73 mol% Nd_20_3 at 1485°,1600°,1620°, and 1650℃, respectively. Each cooling curve of Ga_20_3, 3 Nd_20_3・5 Ga_20_3, NdGa0_3 and 2 Nd_20_3・Ga_20_3 showed an exothermic peak which was assigned to the solidification point, while Nd_20_3 showed two exothermic peaks corresponding to solid state phase transition and solidification. A high temperature phase diagram of the system Ga_20_3-Nd_20_3 has been presented.
社団法人日本セラミックス協会の論文
1988-01-01

Ga_2O_3-Nd_2O_3系の高温状態図

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