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Influence of temperature and crystallization atmosphere on electrical parameters of lead zirconate titanate thin films
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Magnetocrystalline Anisotropy of Ni and Mn Substituted Nd2Fe14B Compounds
No full textMeasurements of the effects of Ni and Mn substitutions for Fe on the magnetic properties of Nd2Fe14B compounds are reported. The Curie temperature is slightly increased with Ni substitution whilst in the case of replacement of Fe by Mn it is reduced drastically. A monotonic decrease of both the lattice parameters a and c is observed. The saturation magnetization is decreased by both Ni and especially Mn substitutions. The composition dependence of both the reorientation spin transition temperature and the cone angle has been measured. The influence of the 3d metal substitution on the Nd anisotropy has been measured and discussed. The composition dependence of the room temperature anisotropy field values, which is an important figure of merit for permanent magnet applications, decreases slightly in the case of Ni and drastically for Mn substitution. A comparison with the case of Co substitution has been made
The influence of low temperature baking on the properties of SrBi2Ta2O9 films from metallorganic solutions
No full textScanning and Friction Force Microscopy (SFFM) of Ferroelectric Pb(Zr,Ti)O3 Thin Films
No full textA scanning friction force microscope has been used to study the surfaces of lead zirconate titanate thin films prepared by sol-gel and pulsed laser ablation. As well as mapping the topography of the films the friction force has proven to be a sensitive tool which can be used to detect compositional changes. Although the laser deposited films had some larger defects up to 500 nm, the grains had a smooth texture (roughness approximate to 2-5 nm). Sol-gel films had grain sizes of the order of 150 nm and roughness of 20-50 nm. Zirconium rich films also had ''rosettes'' approximately 1 mu m in diameter and raised 200 nm above the surrounding matrix. The technique was sensitive enough to discern chemical differences at the grain boundaries and between the ''rosettes'' and the matrix
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