F. W. DE O. AMARANTE's scientific contributions
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Publications (3)
We report a study of the structural and thermal characteristics of calcium titanate alloys Ca[(Li1/3Nb2/3)xTi1−x]O3−δ (abbreviated as CNLTO). CNLTO alloys were prepared using a new procedure in the solid-state reaction method. Then they were studied using x-ray diffraction, Raman scattering spectroscopy and microwave properties. The symmetry of the...
This paper presents a study of the structure and microwave properties of ${\rm Nb}_{1/2}^{5+}{\rm Fe}_{1/2}^{3+}$ substituted into the Ti⁴⁺ site of calcium titanate ceramics. The structural and dielectric properties of solid solutions in CaTi1-x(Nb1/2Fe1/2)xO3, was done. The microwave dielectric properties of solid solutions in CaTi1-x(Nb1/2Fe1/2)x...
Modified CaTiO3 (CTO) ceramics were prepared by the conventional solid-state method. The samples belong to the Pbnm spatial group, showing an orthorhombic structure. The microwave dielectric properties of the Ca[(Li1/3Nb2/3)xTi1-x]O3-δ for ball-milled samples with ratio of 2.4 balls/g, which were calcinated at 900°C (during 5h) and sintered at 1000...
Citations
... The great demand for more thermal-stability materials of relevant technological interest had led to the development of advanced alloys and composites [12e14]. Dielectric properties with temperature stability can achieved by manipulation of crystalline lattice [15,16] or to change the formulation of composites, where the phases present in composite must present dielectric behavior opposite to each other [17e20]. The temperature coefficient in dielectric study can be resumed in follows Equation (1) [21]: ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/277550828933124-1443184682232_Q64/M-Romeu.jpg)
![[object Object]](https://i1.rgstatic.net/ii/profile.image/317556370411520-1452722746163_Q64/Sergio-Sombra-2.jpg)
... The great demand for more thermal-stability materials of relevant technological interest had led to the development of advanced alloys and composites [12e14]. Dielectric properties with temperature stability can achieved by manipulation of crystalline lattice [15,16] or to change the formulation of composites, where the phases present in composite must present dielectric behavior opposite to each other [17e20]. The temperature coefficient in dielectric study can be resumed in follows Equation (1) [21]: ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/11431281161146627-1684936256428_Q64/D-Sousa.jpg)
