(Nd_(1-x)Ca_(x))(Al_(1-x)Fe_(x))O_(3-x/2)(x=0~0.3)陶瓷铁弹性和红外发射率研究

Ferroelasticity and infrared emissivity of(Nd_(1-x)Ca_(x))(Al_(1-x)Fe_(x))O_(3-x/2)

采用1600℃高温固相反应6 h,在NdAlO_(3)中引入Ca^(2+),Fe^(3+)合成(Nd_(1-x)Ca_(x))(Al_(1-x)Fe_(x))O_(3-x/2)(x=0,0.1,0.2,0.3),并采用放电等离子烧结(spark plasma sintering,SPS)陶瓷试样,探究Ca^(2+),Fe^(3+)的引入对NdAlO_(3)的物相组成、发射率和铁弹性的影响。结果表明:高温固相反应成功形成固溶体;引入Ca^(2+)和Fe^(3+)后,氧空位增加并产生轻微晶格畸变,使NdAlO_(3)在2.5~10μm的发射率最高提升至0.9;杂质离子的引入使物相由菱方相逐渐转变为立方相,从而导致铁弹畴消失,但陶瓷试样的断裂韧度仍保持较高水平。

Using a high temperature solid state reaction at 1600℃ for 6 h,(Nd_(1-x)Ca_(x))(Al_(1-x)Fe_(x))O_(3-x/2)(x=0,0.1,0.2,0.3)was synthesized by introducing Ca^(2+)and Fe^(3+)into NdAlO3,and spark plasma sintering(SPS)ceramic samples were used to investigate the effects of Ca^(2+)and Fe^(3+)addition on the phase composition,emissivity and ferroelasticity of NdAlO_(3).The results show that a solid solution can be successfully fabricated through the high temperature solid state reaction.The doping of Ca^(2+)and Fe^(3+)in NdAlO_(3) increases oxygen vacancies and slight lattice distortion occurs,emissivity of NdAlO_(3) within the wavelength range of 2.5-10μm increases the maximum to 0.9.The introduction of impurity ions makes the phase gradually transform from rhombohedral to cubic,leading to the ferroelastic domains vanish.However,the fracture toughness of ceramic samples remains at a high level.