Titre :

Synthesis, structural, optical and electrical properties of La-modified Lead Iron Titanate ceramics for NTCR thermo-resistance based sensors

Auteur(s) :

Omari, L.H. [Auteur]

Hajji, L. [Auteur]
Université Cadi Ayyad [Marrakech] [UCA]
Haddad, M. [Auteur]
جامعة مولاي إسماعيل = Université Moulay Ismaïl [UMI]
Lamhasni, T. [Auteur]
جامعة مولاي إسماعيل = Université Moulay Ismaïl [UMI]
Jama, charafeddine [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]

Titre de la revue :

Materials Chemistry and Physics

Numéro :

223

Pagination :

60-67

Date de publication :

2019-02-01

Discipline(s) HAL :

Sciences de l'ingénieur [physics]/Matériaux
Sciences de l'ingénieur [physics]/Génie des procédés
Chimie/Matériaux
Chimie/Polymères

Résumé en anglais : [en]

A La-modified Lead Iron Titanate (Pb1−xLax)(Fe0.01Ti0.99)O3 (x = 0, 4, 8, 12, 16 and 20%) (Lx-LITO) ceramics have been synthesized by sol-gel route. The structural properties of these compounds have been examined by XRD ...
Lire la suite >A La-modified Lead Iron Titanate (Pb1−xLax)(Fe0.01Ti0.99)O3 (x = 0, 4, 8, 12, 16 and 20%) (Lx-LITO) ceramics have been synthesized by sol-gel route. The structural properties of these compounds have been examined by XRD and Raman spectroscopy. The Optical properties of Lx-LITO have been investigated by UV- visible spectroscopy to evaluate their optical band gap (Eg). Moreover, we have studied in details the effect of dopant content (x%) on the structural and dielectric properties at a large range of temperature up to 600 °C and frequency 100 Hz-1MHz. At room temperature, Lx-LITO have relatively high real permittivity (εʹ) which increases from 250 to 850 with rising x% and insignificant dielectric losses (tan(δ) < 0.01 at 1 kHz). We have investigated the dielectric diffuse phase transition using Curie-Weiss law and modified Uchino law. The results indicate the appearance of relaxation behavior from x = 8% and the existence of dielectric anomalies from x = 16% at paraelectric phase. In addition, the ceramics Lx-LITO display a negative temperature coefficient NTC resistance as the case of a thermistor. Resistance–temperature characteristics (RTCs) are estimated by fitting thermistor equation. The results are in agreement with the suitable values, which indicate that for x<16% these materials can be used in high-temperature thermistors and also for x>16% at room-temperature thermistor applications. The effect of dopant content (x%) on NTC parameters is discussed and appears to be promising material for NTCR applications.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
ENSCL
CNRS
INRA

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Ingénierie des Systèmes Polymères

Date de dépôt :

2019-05-17T09:25:10Z
2023-11-15T10:23:41Z