酸化クロム(III)と無定形ホウ素粉末の固相反応によるクロムホウ化物の合成

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Solid-state reactions between ultrafine chromia powder, which was produced by the thermal decomposition of chromium formate, and amorphous boron powder, were carried out in a vacuum of 10^<-2> to 10^<-3> Pa at temperatures of 600°to 1600℃ for 2h.In the reaction at B/Cr_2O_3 mole rations of 1.5 to 7.0 and 1600℃, five kinds of chromium borides:Cr_5B_3, CrB, Cr_3B_4, Cr_2B_3 and CrB_2, were obtained.Single phases of CrB and CrB_2 were obtained at the mole ratios of 3.0 and 7.0, and at 1600°and over 1000℃, respectively.The chemical compositions of the single phases of CrB and CrB_2 were Cr_<0.93>B and Cr_<0.98>B_2, respectively.Lattice parameters of the chromium borides are as follows:CrB;a=0.2967(1)nm, b=0.7868(1)nm, c=0.2932(1)nm, V=0.0684(6)nm^3:CrB_2;a=0.2973(1)nm, c=0.3072(3)nm, V=0.0235(3)nm^3
社団法人日本セラミックス協会の論文
1998-09-01