Investigation of Ga Doping for Non-stoichiometric Sodium Bismuth Titanate Ceramics

Abstract The electrical performance of Ga3+ doping Na0.5Bi0.5TiO3-based oxygen ion conductor was studied. The Na0.52Bi0.47Ti1−xGaxO3−δ (x = 0, 0.01, 0.015, 0.02) samples were fabricated by the means of traditional solid-state reaction. The results of AC impedance measurement show that the bulk conductivity of Na0.52Bi0.47Ti1−xGaxO3−δ samples decrease monotonously with the increase of Ga3+ doping. At 673 K, the bulk conductivity of the Na0.52Bi0.47Ti0.98Ga0.02O3−δ sample is 7.19×10− 4 S/cm, which is lower than that of Na0.52Bi0.47TiO3−δ sample under the identical test temperature. The highest total conductivity emerges in the Na0.52Bi0.47Ti0.99Ga0.01O3−δ sample with 1.387×10− 4 S/cm at 623 K for the Ga3+ doping content of 1 mol%, which demonstrate that a slight of Ga3+ doping supports the enhancement of the total conductivity. A relaxation peak was observed in the Na0.52Bi0.47Ti1−xGaxO3−δ compounds. As the Ga3+ ions were introduced into the Na0.52Bi0.47TiO3−δ compound, there is an increasing trend of the relaxation activation energy educed by the internal friction test. In addition, the oxygen relaxtion height of Na0.52Bi0.47Ti1−xGaxO3−δ samples decreases along with the introduction of the Ga3+ doping, suggesting that the introduction of the Ga3+ leads to the decrease of mobile oxygen vacancy .

Download Full-text

Effect of Gd and Ti co-doping on electrical performance of Bi2O3 oxygen ion conductor

Materials Research Express ◽

10.1088/2053-1591/ac4880 ◽

2022 ◽

Author(s):

Qiang Yang ◽

Zeyang Luo ◽

Pei Zhu ◽

Yunhe Wei ◽

Huan Wang ◽

...

Keyword(s):

Electrical Properties ◽

Solid Phase ◽

Synthesis Method ◽

Fluorite Structure ◽

Electrical Performance ◽

Ion Conductor ◽

Co Doping ◽

Oxygen Ion ◽

Oxygen Ion Conductor ◽

Lower Temperature

Abstract In this study, a new oxygen ion conductor electrolyte material with high conductivity was reported. Bi2O3 was co-doped with Gd2O3 and TiO2 by solid-phase synthesis method to obtain Bi1-3xGd2xTixO1.5+δ and Bi0.76Gd0.18-xTixO1.5+δ (TGSB) ceramics. The phase composition, surface morphology and electrical properties of TGSB samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and AC impedance respectively. XRD results show that only 6T12GSB has a single cubic fluorite structure, and impurity phases appear in other samples. The SEM results show that only when the doping concentrations of Gd and Ti are 12 mol.% and 6 mol.% respectively, the particle size is relatively smaller and there are no obvious pores. From the analysis of electrical properties, Gd dopant is helpful to the stability of the Bi2O3 phase than Ti dopant, but not beneficial to higher conductivity. When the doping concentration of Gd is higher than 16 mol.%, it becomes more stable. The conductivity of the 6T12GSB sample is relatively high. The conductivity of the TGSB samples is higher than that of the TLSB samples under the lower temperature condition (< 450 °C), and the electrical performance of Bi2O3-based materials are enhanced especially at low temperature.

Download Full-text

Structure, ionic transport properties and ion dynamics of Ce0.8Y0.2O1.9 oxygen ion conductor: Understanding the impact of sintering temperature

Journal of Solid State Chemistry ◽

10.1016/j.jssc.2021.122451 ◽

2021 ◽

pp. 122451

Author(s):

Sk Anirban ◽

Abhigyan Dutta

Keyword(s):

Transport Properties ◽

Sintering Temperature ◽

Ionic Transport ◽

Ion Dynamics ◽

Ion Conductor ◽

Oxygen Ion ◽

Oxygen Ion Conductor ◽

The Impact

Download Full-text

THERMODYNAMICS AND CATION DIFFUSION IN THE OXYGEN ION CONDUCTOR LSGM

Solid State Ionics ◽

10.1142/9789812702586_0088 ◽

2004 ◽

pp. 787-797 ◽

Cited By ~ 2

Author(s):

M. MARTIN ◽

O. SCHULZ

Keyword(s):

Cation Diffusion ◽

Ion Conductor ◽

Oxygen Ion ◽

Oxygen Ion Conductor

Download Full-text

Recent Advances in Synthesis of Lanthanum Silicate Apatite Powders as New Oxygen-Ion Conductor for IT-SOFCs: A Review

Frontiers in Ceramic Science ◽

10.2174/9781681084312117010008 ◽

2017 ◽

pp. 42-69

Keyword(s):

Ion Conductor ◽

Oxygen Ion ◽

Recent Advances ◽

Oxygen Ion Conductor ◽

Lanthanum Silicate

Download Full-text

Tetragonal zirconia polycrystals — a high performance solid oxygen ion conductor

Solid State Ionics ◽

10.1016/0167-2738(92)90087-6 ◽

1992 ◽

Vol 52 (1-3) ◽

pp. 15-21 ◽

Cited By ~ 40

Author(s):

W WEPPNER

Keyword(s):

High Performance ◽

Tetragonal Zirconia ◽

Ion Conductor ◽

Oxygen Ion ◽

Solid Oxygen ◽

Oxygen Ion Conductor

Download Full-text

Microstructure and Property Study of La2Mo1.5W0.5O9/Ag Composites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.663-665.620 ◽

2010 ◽

Vol 663-665 ◽

pp. 620-624

Author(s):

Chun Li ◽

Da Li ◽

Qian Feng Fang

Keyword(s):

Solid State Reaction Method ◽

Second Phase ◽

Doping Amount ◽

Conventional Solid State Reaction ◽

Single Phase Sample ◽

Ion Conductor ◽

Oxygen Ion ◽

Direct Current Conductivity ◽

Oxygen Ion Conductor ◽

Sample Density

Based on the oxygen ion conductor La2Mo1.5W0.5O9, a series of Ag2O doped samples La2Mo1.5W0.5O9/Ag were prepared with conventional solid-state reaction method. The effects of Ag2O doping on the microstructure and electrical conductivity have been investigated by XRD, FESEM and direct current conductivity measurements. With the increase of Ag2O doping, the grain was further refined and compacted, meanwhile, Ag diffusion distribution in the form of second-phase appear at grain boundary. The sample density and conductivity also gradually increased with the increasing of doping amount. The conductivity of the composite specimen La2Mo1.5W0.5O9 /Ag has a great enhancement when the concentration of Ag2O is around 27 wt%, which is eight times higher than that of the single-phase sample.

Download Full-text

Activity of Bi2O3 in Bi2O3Y2O3 oxygen ion conductor

Journal of Solid State Chemistry ◽

10.1016/0022-4596(92)90088-d ◽

1992 ◽

Vol 98 (1) ◽

pp. 206-209 ◽

Cited By ~ 2

Author(s):

Keqin Huang ◽

Changzhen Wang ◽

Xiuguang Xu

Keyword(s):

Ion Conductor ◽

Oxygen Ion ◽

Oxygen Ion Conductor

Download Full-text

A Composite Ionic-Electronic Conductor in the (Ca,Sr,Ba)-Bi Oxide System

MRS Proceedings ◽

10.1557/proc-658-gg9.14 ◽

2000 ◽

Vol 658 ◽

Author(s):

James K. Meen ◽

Oya A. Gökçen ◽

I-C. Lin ◽

Karoline Müller ◽

Binh Nguyen

Keyword(s):

Polymorphic Transformation ◽

Alkaline Earth ◽

Binary Systems ◽

Bulk Composition ◽

Stability Limit ◽

Rhombohedral Phase ◽

Ion Conductor ◽

Electronic Conductor ◽

Oxygen Ion ◽

Oxygen Ion Conductor

ABSTRACTThe rhombohedral alkaline earth-bismuth oxide phase, an oxygen ion conductor, does not coexist stably with electronic conductors in any of the three binary systems, Ca-Bi-O, Sr-Bi-O, Ba-Bi-O. A thermodynamically stable composite of a rhombohedral phase that contains Ba and Sr or Ca or both with the electronic conductor BaBiO3 may be synthesized. The rhombohedral phase appears to have complete mutual miscibility of the alkaline earth elements. The composi- tions of rhombohedral phase that coexist with BaBiO3 in the Sr-Ba-Bi ternary system and the Ca- Sr-Ba-Bi quaternary systems are described. The value of ionic conductivity of the rhombohedral phase (at a constant Bi: [Ca+Sr+Ba]) is not dependent on the relative amounts of Ca, Sr, and Ba. The temperature at which the rhombohedral phase undergoes a polymorphic transformation from a low-temperature (2) form that is a weak ion conductor to a high-temperature (β1) form that is a much better oxygen ion conductor. The temperatures of the polymorphic transformation and of the upper stability limit of the rhombohedral phase both depend strongly on Ca: Sr: Ba. The β1 form develops in the Ba-Bi system at the lowest temperatures and at the highest ones in the Ca- Bi system. On the other hand, the Ca-Bi phase has greater thermal stability than its Ba ana- logues. The temperature range over which a useful composite conductor can operate is, there- fore, strongly dependent upon the bulk composition of the system.

Download Full-text