Ba0.6Sr0.4TiO3 thin films doped with K were deposited on Pt/Ti/SiO2/Si substrates by the chemical solution deposition method. The structure, surface morphology and the dielectric and tunable properties of Ba0.6Sr0.4TiO3 thin films have been studied in detail. The K content in Ba0.6Sr0.4TiO3 thin films has a strong influence on the material's properties including surface morphology and the dielectric and tunable properties. It was found that the Curie temperature of K-doped Ba0.6Sr0.4TiO3 films shifts to a higher value compared with that of undoped Ba0.6Sr0.4TiO3 thin films, which leads to a dielectric enhancement of K-doped Ba0.6Sr0.4TiO3 films at room temperature. At the optimized content of 0.02 mol, the dielectric loss tangent is reduced significantly from 0.057 to 0.020. Meanwhile, the tunability is enhanced obviously from 26% to 48% at the measured frequency of 1 MHz and the maximum value of the figure of merit is 23.8. This suggests that such films have potential applications for tunable devices.

Effects of magnetic field and light illumination on the electrical transport properties of La 7/8 Sr 1/8 MnO3 thin film grown on a Si substrate are investigated. The film shows an insulator-metal transition at 𝑇𝑃 ≈ 191.9 K and a low-temperature resistance minimum at 𝑇min ≈ 48 K in darkness. Both magnetic field and light illumination shift the insulator-metal transition temperature 𝑇𝑃 to be higher, while the low-temperature transport properties of the film induced by them show different trends. That is, the magnetic field and light illumination make the 𝑇min shift to lower and higher temperatures, respectively. The enhancement of both 𝑇𝑃 and 𝑇min under light illumination could be explained in terms of photoinduced hole-doping and demagnetization effects of La 7/8 Sr 1/8 MnO3.

The new type of pulse neutron detector consists of two PIN detectors. The respon se for the rays was studied with the pulse gamma sources. The neutron respons e was studied using the DT neutron sources and compared with the scintillator de tector. Results show that the detector is insensitive to gamma radiation, and th e neutron sensitivity was determined by the neutron radiator. It is a new pulse neutron detector in the neutron and gamma mixed radiation fields.