The solid solutions Ce_(0.9)RE_(0.1)O_(2-δ)(RE=Pr, Nd,Sm, Gd, Dy) were prepared by sol-gel method. The XRD measurement shows that the solid solution is crystallized in cubic fluorite-type structure and the cell volum...The solid solutions Ce_(0.9)RE_(0.1)O_(2-δ)(RE=Pr, Nd,Sm, Gd, Dy) were prepared by sol-gel method. The XRD measurement shows that the solid solution is crystallized in cubic fluorite-type structure and the cell volume of Ce_(0.9)RE_(0.1)O_(2-δ) decreases with the increase of atomic number of RE. The ionic conduction for Ce_(0.9)RE_(0.1)O_(2-δ) was measured by impedance spectroscopy and Ce_(0.9)Pr_(0.1)O_(2-δ) has better conductivity. The linear thermal expansion of Ce_(0.9)RE_(0.1)O_(2-δ) decreases with the increase of atomic number of RE.展开更多
Low temperature sintered Ce_(2)Zr_(3)(Mo_(0.9)W_(0.1)O_(4))_(9)(marked as CZMW)ceramics were synthesized via the conventional solid-state reaction method.X-ray diffraction results showed that the CZMW ceramics belonge...Low temperature sintered Ce_(2)Zr_(3)(Mo_(0.9)W_(0.1)O_(4))_(9)(marked as CZMW)ceramics were synthesized via the conventional solid-state reaction method.X-ray diffraction results showed that the CZMW ceramics belonged to a Trigonal system with R-3C space group,and without any impure phase formation.The experimental facts revealed that the density and grain morphology greatly affected the microwave dielectric properties.The samples sintered at 825℃ exhibited good microwave dielectric properties.ε_(r)=9.85,Q×f=22,980 GHz(at 11.3 GHz)and a satisfactoryT_(f)(-1.5 ppm/℃)value.It is suggested that the CZMW ceramics are suitable for low-temperature co-fired ceramic(LTCC)applications in microwave devices.展开更多
文摘The solid solutions Ce_(0.9)RE_(0.1)O_(2-δ)(RE=Pr, Nd,Sm, Gd, Dy) were prepared by sol-gel method. The XRD measurement shows that the solid solution is crystallized in cubic fluorite-type structure and the cell volume of Ce_(0.9)RE_(0.1)O_(2-δ) decreases with the increase of atomic number of RE. The ionic conduction for Ce_(0.9)RE_(0.1)O_(2-δ) was measured by impedance spectroscopy and Ce_(0.9)Pr_(0.1)O_(2-δ) has better conductivity. The linear thermal expansion of Ce_(0.9)RE_(0.1)O_(2-δ) decreases with the increase of atomic number of RE.
基金the National Natural Science Foundation of China(Grant No.51672036).
文摘Low temperature sintered Ce_(2)Zr_(3)(Mo_(0.9)W_(0.1)O_(4))_(9)(marked as CZMW)ceramics were synthesized via the conventional solid-state reaction method.X-ray diffraction results showed that the CZMW ceramics belonged to a Trigonal system with R-3C space group,and without any impure phase formation.The experimental facts revealed that the density and grain morphology greatly affected the microwave dielectric properties.The samples sintered at 825℃ exhibited good microwave dielectric properties.ε_(r)=9.85,Q×f=22,980 GHz(at 11.3 GHz)and a satisfactoryT_(f)(-1.5 ppm/℃)value.It is suggested that the CZMW ceramics are suitable for low-temperature co-fired ceramic(LTCC)applications in microwave devices.
