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We developed a simple method to fabricate SiO2-sphere-supported N-doped CNTs (NCNTs) for electromagnetic wave (EMW) absorption. EMW absorption was tuned by adsorption of the organic agent on the precursor of the catalysts. The experimental results show that the conductivity loss and polarization loss of the sample are improved. Meanwhile, the impedance matching characteristics can also be adjusted. When the matching thickness was only 1.5 mm, the optimal 3D structure shows excellent EMW absorption performance, which is better than most magnetic carbon matrix composites. Our current approach opens up an effective way to develop low-cost, high-performance EMW absorbers.

d b s t w The paper preaents the result8 of birefringent changes vexwua temperature on L i l W WgQ crystal. He have found two abrupt ahages 0fAna.t 490 % and 545 %.

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The polarization switching characteristics of a ferroelectric heterostructure consists of two different ferroelectric films with surface transition layer within each film and a ferroelectric interfacial coupling at the interface between the two films according to Landau–Devonshire theory in combination with Landau–Khalatnikov dynamic equation, as first presented in this work. A parameter β is introduced to describe the differences of physical characteristics between the two constituent films of the ferroelectric heterostructure. We focus on studying the combined influence of parameter β and ferroelectric interfacial coupling on the polarization switching behavior of the system. The evolution with time of polarization, hysteresis loop, and equilibrium action of the ferroelectric coupling ϕ and parameter β are obtained by numerical calculations. The results exhibit some anomalous phenomena.