Ionic conductivity of acceptor doped sodium bismuth titanate: influence of dopants, phase transitions and defect associates

2017 ◽  
Vol 5 (35) ◽  
pp. 8958-8965 ◽  
Author(s):  
Leonie Koch ◽  
Sebastian Steiner ◽  
Kai-Christian Meyer ◽  
In-Tae Seo ◽  
Karsten Albe ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Ionic Conductivity ◽  
Complex Formation ◽  
Bismuth Titanate ◽  
Dopant Concentration ◽  
Phase Coexistence ◽  
Defect Complex ◽  
Temperature Dependent ◽  
Sodium Bismuth Titanate ◽  
Formation Phase

The temperature dependent ionic conductivity of NBT results from an interplay of defect complex formation, phase coexistence, and dopant concentration.

Phase Formation and Phase Transitions in Nonstoichiometric Sodium Bismuth Titanate Ceramics

2018 ◽  
Vol 54 (7) ◽  
pp. 744-748 ◽  
Author(s):  
E. D. Politova ◽  
A. V. Mosunov ◽  
D. A. Strebkov ◽  
N. V. Golubko ◽  
G. M. Kaleva ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Phase Formation ◽  
Bismuth Titanate ◽  
Sodium Bismuth Titanate ◽  
Titanate Ceramics

Peculiarities of phase transitions in sodium-bismuth titanate

1980 ◽  
Vol 25 (1) ◽  
pp. 395-397 ◽  
Author(s):  
I. P. Pronin ◽  
P. P. Syrnikov ◽  
V. A. Isupov ◽  
V. M. Egorov ◽  
N. V. Zaitseva
Keyword(s):  
Phase Transitions ◽  
Bismuth Titanate ◽  
Sodium Bismuth Titanate

Phase transitions and soft modes in sodium bismuth titanate

1985 ◽  
Vol 63 (1) ◽  
pp. 153-160 ◽  
Author(s):  
S. B. Vakhrushev ◽  
V. A. Isupov ◽  
B. E. Kvyatkovsky ◽  
N. M. Okuneva ◽  
I. P. Pronin ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Bismuth Titanate ◽  
Sodium Bismuth Titanate ◽  
Soft Modes

The temperature-dependent piezoelectric and electromechanical properties of cobalt-modified sodium bismuth titanate

2016 ◽  
Vol 42 (3) ◽  
pp. 4268-4273 ◽  
Author(s):  
Chun-Ming Wang ◽  
Liang Zhao ◽  
Yun Liu ◽  
Ray L. Withers ◽  
Shujun Zhang ◽  
...  
Keyword(s):  
Bismuth Titanate ◽  
Temperature Dependent ◽  
Electromechanical Properties ◽  
Sodium Bismuth Titanate

Proton Effects in KTiOPO4

1989 ◽  
Vol 172 ◽  
Author(s):  
P. A. Morris ◽  
M. K. Crawford ◽  
M. G. Roelofs ◽  
J. D. Bierlein ◽  
P. K. Gallagher ◽  
...  
Keyword(s):  
Activation Energy ◽  
High Temperature ◽  
Ionic Conductivity ◽  
Defect Complex ◽  
Temperature Dependent ◽  
Cooperative Motion ◽  
Oxygen Sublattices ◽  
Defect Mechanism ◽  
Damage Susceptibility

AbstractEvidence supporting the temperature dependent defect mechanism of nonstoichiometry on the potassium and oxygen sublattices in KTP is presented. The primary compensating defects for the formation of vacant potassium sites in typical flux grown KTP are vacant oxygen sites. Protons (OH-) are the principal defect compensating for the formation of vacant potassium sites in high temperature hydrothermal KTP. A model of the ionic conductivity in high temperature hydrothermal KTP is proposed in which specific protons participate in cooperative motion over a limited distance with the potassium vacancies migrating along the “channels” in the structure in the Z-direction. The higher activation energy measured for ionic conductivity in flux grown KTP (0.5 eV) relative to high temperature hydrothermal (0.3 eV) is suggested to be due to the energy required to dissociate from a defect complex, such as a (VO - VK). The correlation of ionic conductivity to damage susceptibility appears to be due to the levels of compensating defects for vacant potassium sites in KTP, which are related to the concentrations of Ti3+ formed in the crystals. Further study is ongoing to understand the specific mechanisms involved in the ionic conductivity and damage in KTP grown by the flux and hydrothermal techniques.

SYNTHESIS OF LEAD FREE SODIUM BISMUTH TITANATE (NBT) CERAMIC BY CONVENTIONAL AND MICROWAVE SINTERING METHODS

2011 ◽  
Vol 01 (01) ◽  
pp. 71-77 ◽  
Author(s):  
M. VENKATA RAMANA ◽  
S. ROOPAS KIRAN ◽  
N. RAMAMANOHAR REDDY ◽  
K. V. SIVA KUMAR ◽  
V. R. K. MURTHY ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Bismuth Titanate ◽  
Microwave Sintering ◽  
Structural Phase ◽  
Lead Free ◽  
Ferroelectric Ceramics ◽  
Elastic Behavior ◽  
Sodium Bismuth Titanate ◽  
Sensitive Property ◽  
Longitudinal Modulus

Dielectric studies were carried out on a lead free Sodium Bismuth Titanate, NBT, ( Na 0.5 Bi 0.5 TiO 3) composition. The material was synthesized by conventional ceramic method (CS) and microwave sintering (MS). The presence of single phase has been confirmed by X-ray diffraction and scanning electron microscopy of NBT ceramic. The later technique (MS) resulted in material with high density, dielectric properties and improved microstructure. The transition temperature was observed slightly higher for microwave sintered (MS) material. Longitudinal modulus measurements are very sensitive property to identify the phase transitions in ceramics. Longitudinal modulus (L) measurements were also employed on these samples in the frequency 136 kHz and can be studied in the wide temperature range 30°C to 400°C. The elastic behavior (L) showed a break at two temperatures (~200°C and 350°C) in both the conventional and microwave sintered ceramics. In NBT ceramics, permittivity anomalies are connected to modulus anomalies. The results are correlated with the dielectric measurements. This behavior explained in the light of structural phase transitions in the ferroelectric ceramics.

The high-pressure structural phase transitions of sodium bismuth titanate

2005 ◽  
Vol 220 (8) ◽  
Author(s):  
Pamela A. Thomas ◽  
Jens Kreisel ◽  
A. Michael Glazer ◽  
Pierre Bouvier ◽  
Quangzhong Jiang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Phase Transitions ◽  
Bismuth Titanate ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Sodium Bismuth Titanate

AbstractThe crystal structure of sodium bismuth titanate, Na

Ferroelectric Phase Transitions of Modified [(Na0.5Bi0.5)1 –xLax]TiO3 (x = 0–0.1) Sodium Bismuth Titanate-Based Ceramics

2020 ◽  
Vol 56 (1) ◽  
pp. 91-96
Author(s):  
E. D. Politova ◽  
D. A. Strebkov ◽  
A. V. Mosunov ◽  
N. V. Golubko ◽  
G. M. Kaleva ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Bismuth Titanate ◽  
Ferroelectric Phase ◽  
Sodium Bismuth Titanate ◽  
Ferroelectric Phase Transitions
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