19 documents found, page 1 of 2
Influence of calcium concentration on the structural and electrical properties ...
Silva, Margarete S.; Cavalheiro, Alberto A.; Zaghete, Maria A. [UNESP]; Cilense, Mário [UNESP]; Longo, Elson [UNESP]; Cavenago, Gustavo F.Made available in DSpace on 2022-04-29T12:38:27Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-01-01; Lead zirconate titanate, with Zr/Ti ratio of 53/47 was prepared by the polymeric precursor method. The powders were doped with 0, 0.2, 0.4 end 0.6 mol% of Ca2+ and characterized by XRD. The percentages of tetragonal and rhombohedral phases were calculated through Rietveld refinement. A systematic study ...
Study on the piezoelectric behavior and structural changes of strontium doped P...
Silva, Margarete S.; Silva, Lucas L.; Souza, Eliane F.; Longo, Elson [UNESP]; Zaghete, Maria A. [UNESP]; Cavalheiro, Alberto A.Made available in DSpace on 2022-05-02T17:01:40Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-01-01; Some piezoelectric properties of lead zirconate titanate PbZr0.53Ti0.47O3 ceramic samples sintered at 1100ºC for 3 hours has been investigated in this work and compared to the strontium modification at 0.2, 0.4, and 0.6 mol%. Polarization versus Electric Field curve and d33 and Kp piezoelectric paramete...
Effect of strontium doping on the structural, morphological, and dielectric pro...
Silva, Margarete S.; Dias, Rafael G.; Souza, Eliane F.; Cilense, Mário [UNESP]; Zaghete, Maria A. [UNESP]; Cavalheiro, Alberto A.Made available in DSpace on 2022-05-02T17:01:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-01-01; Strontium-modified lead zirconate titanate ceramics was prepared by the polymeric precursor method. The effect of Pb(II) substitution by Sr(II) in A site of the perovskite structure at molar percentages of 0.0, 0.2, 0.4 and 0.6 mol% was investigated through XRD and Rietveld method. The increasing of str...
Multi-dimensional architecture of Ag/alpha-Ag2WO4 crystals: insights into micro...
Cruz, Lilian; Teixeira, Mayara M.; Teodoro, Vinicius; Jacomaci, Natalia [UNESP]; Laier, Leticia O. [UNESP]; Assis, Marcelo; Macedo, Nadia G.Made available in DSpace on 2021-06-25T11:44:01Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-12-07; LNLS, Campinas, SP, Brazil; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); In this study, we report the potential of ethylenediamine (En) in the modi...
Correlation of photocatalytic activity and defects generated in Ca2+-based hete...
Coleto, Ubirajara [UNESP]; Amoresi, Rafael A. C. [UNESP]; Pereira, Chrystopher A. M. [UNESP]; Schmidt, Bruna W. [UNESP]; Iani, Isabela M. [UNESP]Made available in DSpace on 2021-06-25T11:11:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-11-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); In this work a new semiconductor based on calcium heterojunction (CaO/CaTiO3) was evaluated to the optical properties correlated to crystalline lattice defects. The heterojunctions of the semiconductor were prepared by the sol–gel route and ...
Metallic behavior in STO/LAO heterostructures with non-uniformly atomic interfaces
Amoresi, Rafael A.C. [UNESP]; Cichetto, Leonélio; Gouveia, Amanda F.; Colmenares, Yormary N.; Teodoro, Marcio D.; Marques, Gilmar E.; Longo, ElsonMade available in DSpace on 2020-12-12T02:44:25Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-09-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Universitat Jaume I; Generalitat Valenciana; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); The search for new and low-power switching devices involving the integration of semiconductor thin films is of interest, and ha...
Chemical synthesis and epitaxial growth methods for the preparation of ferroele...
Teixeira, Guilhermina F. [UNESP]; Lustosa, Glauco M.M.M. [UNESP]; Zanetti, Snia M. [UNESP]; Zaghete, Maria A. [UNESP]Made available in DSpace on 2020-12-12T01:20:29Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-01-01; Ferroelectric materials have constantly attracted scientific interest because of their technological applications. The efficiency of ferroelectrics materials is related to the way they are processed because characteristics such as chemical purity, phase homogeneity, and size and shape of the particles a...
Nanosized ferroelectrics: Preparation, properties, and applications
Lustosa, Glauco M.M.M. [UNESP]; Teixeira, Guilhermina F. [UNESP]; Bastos, Wagner B. [UNESP]; Zanetti, Sonia M. [UNESP]; Perazolli, Leinig A. [UNESP]Made available in DSpace on 2020-12-12T01:20:29Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-01-01; Top-down and bottom-up are two kinds of processes employed to obtain ferroelectric nanostructures. Top-down processes are physical methods involving the use of a bulk ferroelectric material to create coherently and continuously ordered nanosized structures (such as focused ion beam milling, nanoimprint ...
Microwave-Driven Hexagonal-to-Monoclinic Transition in BiPO4: An In-Depth Exper...
Tello, Ana C. M.; Assis, Marcelo; Menasce, Ricardo; Gouveia, Amanda F.; Teodoro, Vinicius; Jacomaci, Natalia [UNESP]; Zaghete, Maria A. [UNESP]Made available in DSpace on 2020-12-12T01:25:11Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-06-01; Present theoretical and experimental work provides an in-depth understanding of the morphological, structural, electronic, and optical properties of hexagonal and monoclinic polymorphs of bismuth phosphate (BiPO4). Herein, we demonstrate how microwave irradiation induces the transformation of a hexagona...
CeO2 Nanoparticle Morphologies and Their Corresponding Crystalline Planes for t...
Amoresi, Rafael A. C. [UNESP]; Oliveira, Regiane C. [UNESP]; Marana, Naiara L. [UNESP]; De Almeida, Priscila B.; Prata, Paloma S.Made available in DSpace on 2020-12-12T02:29:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-10-25; Currently, numerous properties of semiconducting oxides are correlated to their morphological characteristics resulting from their exposed surfaces. In the present work, the relationship between the following morphologies rod, bean, hexagon, and rod/cube of CeO2 with the exposure of (111), (110), (100),...