La0.5Sm0.2Sr0.3MnO3/(Ag2O)x/2 (x = 0.00, 0.04, 0.08, 0.25, 0.30) samples were prepared by the solid-state reaction method, and their transport behaviors, transport mechanism, and magnetoresistance effect were studied through the measurement and fitting of ρ-T curves. The results show that the element Ag takes part in reaction when the doping amount is small. Ag is mainly distributed at the grain boundary of the host material and is in metallic state when the doping amount is relatively large; then the system becomes a two-phase composite. A small amount of Ag doping can apparently increase grain-boundary magnetoresistance induced by the spin-dependent scattering. The resistivity of the sample doped with 30 mol% Ag is one order of magnitude smaller than that of low-doped samples, and its magnetoresistance in the magnetic field of 0.5 T and at 300 K is strengthened apparently reaching 9.4%, which is connected not only with the improvement of the grain-boundary structure of the host material but also with the decrease of material resistivity.
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机译:具有薄皮的玻璃压塞-在热和压力下会变形,以避免形成接缝AB DE4238918A玻璃压铸塞具有薄如厚度为0.3-0.5毫米的皮肤,由于0.3%的热量和0.2%的拉伸力而分离。在塞子静止之前或之后不久,通过压力介质从芯塞上取下。压力介质也通过孔(2,3,7)供给,以去除热量,从而消除塞子分离后的变形。从玻璃杯。优点-避免在插头和盖环之间形成接缝。 AN 94168712 TI车辆防盗装置-使用弹簧锁定机构,该机构包括两部分的螺栓,上部永久固定在管中,并通过压缩弹簧连接到上管