Synthesis and electric properties of the high-k ceramic composites based on potassium polytitanate modified by manganese

Gorokhovsky, Alexander; Saunina, S. I.; Maximova, Lilia; Tret’yachenko, E. V.; Гоффман, В. Г.; Escalante-Garcı́a, J.I.; Vikulova, María

doi:10.1007/s11164-022-04669-x

Cited by 5 publications

(5 citation statements)

References 35 publications

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“…This can be attributed to increased polymer chain mobility and the amount of charge carriers in the structure, which permit charged species to hop across the polymer blend matrix. The frequency dependence of AC conductivity is regulated by Jonscher's universal power law at different temperatures 45 . The bipolar leaping mechanism is accountable for low‐temperature AC conductivity, while thermally stimulated polaron hopping is accountable for high‐temperature electrical conductivity.…”

Section: Resultsmentioning

confidence: 99%

“…The frequency dependence of AC conductivity is regulated by Jonscher's universal power law at different temperatures. 45 The bipolar leaping mechanism is accountable for low-temperature AC conductivity, while thermally stimulated polaron hopping is accountable for high-temperature electrical conductivity. In the current work, the rise in electrical conductivity with increasing temperature suggests the hopping conduction process, and it also matches the small polaron model.…”

Section: Effect Of Temperature On Conductivitymentioning

confidence: 99%

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Hydroxyapatite nanoparticles reinforced polyvinyl alcohol/chitosan blend for optical and energy storage applications

Ramesan,

Sankar,

Kalladi

et al. 2024

Polymer Engineering & Sci

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Biopolymer blend nanocomposite films composed of polyvinyl alcohol (PVA) and chitosan (CS) with varying quantities of hydroxyapatite (HA) nanoparticles were developed using a green solution casting method. The formation of blend nanocomposite was confirmed by Fourier‐transform infrared spectroscopy (FTIR), ultraviolet–visible (UV) spectrometer, field‐emission scanning electron microscopy (FE‐SEM), X‐ray diffraction (XRD), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). Mechanical parameters such as tensile strength, percentage elongation at break, hardness, dielectric constant, and temperature‐dependent alternating current (AC) conductivity were analyzed. The bonding between the nanoparticles and PVA/CS blend was verified by the shift in distinctive peaks of blend in the nanocomposites to a higher wavenumber in the FTIR spectra. The UV spectra demonstrated the difference in absorbance and transmittance of the PVA/CS blend with the reinforcement of HA nanofillers. The bandgaps of the nanocomposites marginally decreased with an increase in nanoparticle loading. The SEM and XRD patterns revealed the ordered arrangement of the blend matrix due to the presence of nanoparticles. The assessment of thermal characteristics obtained from DSC and TGA demonstrated a clear increase in phase transition temperature and thermal stability of nanocomposites. The electrical conductivity measurement indicated a rise in dielectric constant and AC conductivity of blend nanocomposites with the addition of nanoparticles. The temperature‐dependent AC conductivity showed a reduction in activation energy as temperature and nanoparticle loading increased. The tensile strength and surface hardness of the PVA/CS blend nanocomposite increased with the dosage of HA content in the blend matrix.Highlights A series of polyvinyl alcohol (PVA)/chitosan (CS)/hydroxyapatite (HA) nanocomposites were prepared by the green method Enhanced optical property, thermal stability, and glass transition temperature Possess excellent dielectric constant and alternating current conductivity The inclusion of HA increased the mechanical strength of the PVA/CS blend A potential blend nanocomposite for flexible optoelectronic and charge storage devices.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Temperature On Conductivitymentioning

confidence: 99%

Hydroxyapatite nanoparticles reinforced polyvinyl alcohol/chitosan blend for optical and energy storage applications

Ramesan,

Sankar,

Kalladi

et al. 2024

Polymer Engineering & Sci

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“…The parent PPT-4, characterized with the chemical composition of K 2 O•4TiO 2 , was treated with distilled water until a pH value of the dispersion equal to 7. This value corresponds to the partial dealkalization of the parent product (PPT-4) used to obtain intermediates for the synthesis of functional ceramics having the hollandite-like structure [4,6]. The resulting powder was filtered using a Whatman paper filter No.…”

Section: Methodsmentioning

confidence: 99%

“…An example of the implementation of this approach is the synthesis of intermediates based on quasi-amorphous potassium polytitanates (PPT) subjected to modification under various chemical and thermal effects [4][5][6]. The obtained materials exhibit a high thermal reflectance, a low coefficient of friction, and a high dielectric constant [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Some [TiO 6/2 ] octahedra contain vacancies, from 5 to 20 % of the octahedra are formed by titanium with the Ti 3+ valence state, their shape is distorted, which leads to the formation of a deformed layered structure with an interlayer distance varying over a wide range (from 0.2 to 1.1 nm). H 3 O + and K + cations, which compensate the excess negative charge of titanate polyanions, as well as molecules of waterlocated in the interlayer space of PPT particles [6,8].…”

Section: Introductionmentioning

confidence: 99%

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Kinetic analysis of the crystallization processes in the protonated potassium polytitanates

Gorokhovsky

Saunina

Zakharyevich

et al. 2023

JAMT

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The kinetics of the TiO 2 crystalline phase formation in the powdered samples of protonated potassium polytitanate (PPPT) having an amorphous layered structure was studied by differential scanning calorimetry (DSC). The theoretical analysis was carried out using the THINKS free software, based on the methods of Kissinger, Friedman and Vyazovkin, as well as the method of combined kinetic analysis, and the methods of linear and non-linear regression. The obtained results have shown that the formation of the crystalline TiO 2 (anatase) in the investigated system occurs in two stages. The theoretical results were analyzed taking into account their correspondence to the kinetic models of crystallization process including: two independent flexible one-step stages; two sequentially flowing flexible single-step stages; two parallel flowing (competing) flexible single-step stages. The main kinetic parameters of the crystallization process are determined using the best satisfaction to the Bayesian fit criterion (BIC). Based on the results obtained, the mechanism of two sequentially flowing stages is proposed. The first stage of crystallization, involves the diffusion of surface-active components (H 2 O, H 3 O + , K + ) in the interlayer space to the surface of PPT particles and following desorption of water and transformation of the layered amorphous PPPT structural polyanions into the distorted crystalline anatase-like structure. At the second stage of the process, the distorted anatase structure is transformed into the traditional crystalline form, and, finally, the process of crystallization of protonated PPT is completed by the formation of small crystals of potassium hexatitanate onto the surface of particles with the participation of potassium ions previously diffused from the bulk.

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Lead‐Based Ceramics for High‐Performance Supercapacitors

Hussain,

Khan,

Ata‐ur‐Rehman

et al. 2023

Electroceramics for High Performance Supercapacitors

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Synthesis and electric properties of the high-k ceramic composites based on potassium polytitanate modified by manganese

Cited by 5 publications

References 35 publications

Hydroxyapatite nanoparticles reinforced polyvinyl alcohol/chitosan blend for optical and energy storage applications

Hydroxyapatite nanoparticles reinforced polyvinyl alcohol/chitosan blend for optical and energy storage applications

Kinetic analysis of the crystallization processes in the protonated potassium polytitanates

Lead‐Based Ceramics for High‐Performance Supercapacitors

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