Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"tetragonality"”.
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Fabrication And Damping Behavior Of Particulate BaTiO3 Ceramic Reinforced Copper Matrix Composites
… rate and, uniaxial compaction pressure on the tetragonality and hence the ferroelectric properties of barium titanate powder were investigated using differential scanning calorimetry (DSC) and x-ray diffraction (XRD). The results show that sintering atmosphere and cooling rates have little …
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Metallorganische Chemische Gasphasenabscheidung (MOCVD) ferroelektrischer Dünnschichten : Herstellung und Charakterisierung
… verified in thin films by X-ray diffraction. The tetragonality in PBZT films decreases linearly with barium content. In epitaxial films it could be shown by the method of reciprocal space mapping that the tilting angle of a-domains in c-axis oriented films is also being decreased by increasing …
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Spectroscopic perspectives on ultrafast coupling phenomena in perovskite oxides
… observable for a strain amplitude exceeding the tetragonality of the material. It is attributed to a coupling of the high frequency phonons to ferroelastic domain walls in the material. I propose a new mechanism for the coupling of strain waves to the domain walls that is only effective for high …
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Synthesis-Structure-Property Relationships in Lead-Free Piezoelectric Materials
… Room temperature XRD patterns showed decrease in tetragonality of BT after modifying with BCN (BT-BCN). Modifications with Sn lead to further decrement in tetragonality and the room temperature structure became cubic at 6.0 at% doping level. The decrement in tetragonality was accompanied by …
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Piezoelectric-based Multi-Scale Multi-Environment Energy Harvesting
… were composed of oriented PTO crystals with high tetragonality; these arrays could be promising candidates for nanogenerators. Different designs for energy harvesters were explored as a means of improving energy conversion efficiency. Piezoelectric energy harvesters were designed and constructed …
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Modelling of Microstructure Development in Silicon-containing Bainitic Free-machining Steels
… as the transformation temperature is reduced. Tetragonality was not observed in either the bainitic ferrite or martensite, because the carbon content of the alloy is relatively low, and the Zener ordering temperature is below the bainite and martensite transformation temperature. No significant …