Dielectric Study of the Effect of a Sol-Gel Inorganic Network on Polymeric Relaxation Dynamics in Acrylic/Titania Hybrids

2005 ◽  
Vol 206 (14) ◽  
pp. 1439-1447 ◽  
Author(s):  
François X. Perrin ◽  
Van Nhan Nguyen ◽  
Jean L. Vernet
Keyword(s):  
Sol Gel ◽  
Dielectric Study ◽  
Relaxation Dynamics ◽  
Inorganic Network

Structural, Ferroelectric, Pyroelectric, and Dielectric Study of Bi0.5Na0.5TiO3 Ceramics synthesized with Precursors Obtained by Sol-Gel Method doped with Lanthanum

2021 ◽  
Author(s):  
José de Jesus Serralta-Macías1 ◽  
Francisco de Paula Calderón-Piñar ◽  
Osmany García Zaldivar ◽  
Daniel Olguin ◽  
jose martin yañez limon
Keyword(s):  
Ferroelectric Properties ◽  
Sol Gel ◽  
Rhombohedral Phase ◽  
Sodium Titanate ◽  
Dielectric Study ◽  
Scanning Calorimetry ◽  
Gel Method ◽  
Sol Gel Method ◽  
Diffraction Patterns ◽  
Ferroelectric Hysteresis

Abstract In this work, the ferroelectric, pyroelectric and dielectric properties of La-doped bismuth sodium titanate ceramics (BNLT) using amounts from 0 to 6.7 at.% La were studied. The precursor powders used to make dense BNLT ceramics were obtained by the sol-gel method using the acetic acid route. All samples were calcined at 700°C for 1hr and sintered at 1150°C for 30 min in an encapsulated crucible to avoid Na and Bi volatilization, obtaining relative densities equal or higher than 94%. The obtained X-ray diffraction patterns typical of the perovskite structure, confirm the incorporation of lanthanum into the lattice, evolving from rhombohedral phase to a mixture of rhombohedral and cubic structure for higher concentrations. Thermogravimetry (TG) and Differential Scanning Calorimetry (DSC) results indicate that the crystallization of precursors powders of BNT takes place between 500 and 700°C. Additionally, the Scanning Electron Microscopy (SEM) micrographs reveal a decrement of grain size from 4.5 to 0.5 μm with increasing La content. The ferroelectric hysteresis curves show that the best ferroelectric properties were obtained for BNT 1.3% La, where the obtained values of remnant polarization and coercive field were Pr=29 μC/cm2 and Ec=39 kV/cm respectively. Also, at this concentration, the pyroelectric response shows the higher value, 4 times the pyroelectric signal of the pure BNT.

Structure and diffuse dielectric study of CCT1-xBixO thin film for x=0.02 synthesized via untraditional sol-gel route

2021 ◽  
Vol 601 ◽  
pp. 412673
Author(s):  
A.K. Mishra ◽  
D. Dwibedy ◽  
Manas R. Panigrahi ◽  
M. Devi
Keyword(s):  
Thin Film ◽  
Sol Gel ◽  
Dielectric Study

Organophosphorus-Based Organic / Inorganic Hybrids

2000 ◽  
Vol 628 ◽  
Author(s):  
André Vioux ◽  
P. Hubert Mutin ◽  
Jean Le Bideau ◽  
Dominique Leclercq
Keyword(s):  
Sol Gel ◽  
Three Dimensional ◽  
Coupling Agents ◽  
Inorganic Hybrid ◽  
Metal Oxide Surfaces ◽  
Metal Phosphonates ◽  
Concise Review ◽  
Synthetic Routes ◽  
Gel Processing ◽  
Inorganic Network

ABSTRACTThis paper is a concise review of some recent works which highlights the interest of phosphonate groups RP (O)32- in the field of organic/inorganic hybrid materials, as a general alternative to silicon coupling agents in anchoring of an organic group to an inorganic support or within an inorganic network. Examples, focused on metals of groups 4 and 13, illustrate various synthetic routes, from the hydrothermal synthesis of two- or three-dimensional metal phosphonates, to the introduction of organic moieties into oxide matrices by sol-gel processing, without excluding the grafting of metal oxide surfaces.

Preparation and characterization of organic-inorganic hybrid materials incorporating diphosphino moieties. Study of the accessibility of the phosphorus atoms included into the material

2000 ◽  
Vol 78 (11) ◽  
pp. 1519-1525 ◽  
Author(s):  
Jean-Philippe Bezombes ◽  
Claude Chuit ◽  
Robert JP Corriu ◽  
Catherine Reyé
Keyword(s):  
Solid State ◽  
Hybrid Materials ◽  
Sol Gel ◽  
Inorganic Hybrid ◽  
Sol Gel Process ◽  
Inorganic Network

The hydrolysis-polycondensation by the sol-gel process of the aromatic diphosphines (X3SiC6H4)2PC6H4P(C6H4SiX3)2, which are rigid molecules bearing four hydrolysable SiX3 groups (X = OiPr, H), leads to new organic-inorganic hybrid materials, characterized by solid state 13C, 29Si, and 31P NMR spectroscopies. The accessibility of the phosphorus centres incorporated into the xerogel obtained from the diphosphine with X = OiPr has been studied. All the phosphorus atoms reacted quantitatively with H2O2, S8, and CH3I but only 20% with the more bulky reagent W(CO)5·THF. This result is explained by the rigidity of the inorganic network resulting from the high number of hydrolysable Si-OiPr groups in the precursor.Key words : Diphosphines, sol-gel process, xerogels, solid 31P NMR.

scholarly journals Structural, optical and electrical properties of Mn-doped ZnFe2O4 synthesized using sol-gel method

2021 ◽  
Author(s):  
Harshpreet Cheema ◽  
Vedika Yadav ◽  
Ram Sundar Maurya ◽  
Varsha Yadav ◽  
Aditya Kumar ◽  
...  
Keyword(s):  
Sol Gel ◽  
Dielectric Constants ◽  
Dielectric Study ◽  
Thermal Dependence ◽  
Chemical Route ◽  
Dielectric Characteristics ◽  
Mixed Ionic Electronic Conductors ◽  
Electronic Conductors ◽  
Mn Doped ◽  
Preliminary Phase

Abstract Samples with doping of Mn (0, 2, and 4%) in ZnFe2O4 were prepared by sol-gel chemical route at 80oC. X-ray powder diffraction and Raman spectrum analysis were used to determine the preliminary phase of obtained samples. W-H and SSP plots were used to determine the crystallite size and micro-strain of samples. Using zeta potential and scanning electron microscope, the surface charge and morphology of the prepared samples were studied. The optical bandgap of sample suggested that it was semiconducting. The dielectric characteristics of samples were examined as a function of temperature at various frequencies (1 KHz, 10 KHz, 100 KHz, and 1 MHz) (60-600oC). Dielectric study revealed the presence of interfacial and orientational polarization, with dielectric constants and dissipation factors ranging from (0.7–460) to (0.3–0.8), remain thermally stability up to 300oC. In samples ZF-0, ZF-2, and ZF-4, the thermal dependence of DC conductivity demonstrates Arrhenius transport with one, two, and three regions of conduction, respectively. The sources of charge carrier in samples were Vo,e1 defects (Vo - 2FE2+ Fe3+') and (2M3+ Zn2+ - 2FE2+ Fe3+'). The current work could help identify possible applications in semiconductor devices, thermally stable capacitors, and as mixed ionic electronic conductors in solid oxide fuel cells.

scholarly journals Structural, ferroelectric, pyroelectric, and dielectric study of Bi0.5Na0.5TiO3 ceramics synthesized with precursors obtained by the sol–gel method and doped with lanthanum

AIP Advances ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 065020
Author(s):  
J. J. Serralta-Macías ◽  
F. Calderón-Piñar ◽  
O. García Zaldivar ◽  
D. Olguín ◽  
J. M. Yáñez-Limón
Keyword(s):  
Sol Gel ◽  
Dielectric Study ◽  
Gel Method ◽  
Sol Gel Method
Sign in / Sign up

Export Citation Format

Share Document