Ferroelectric Polarization Properties in High-Performance Bismuth Sodium Titanate Single Crystals

2011 ◽  
Vol 485 ◽  
pp. 7-10 ◽  
Author(s):  
Muneyasu Suzuki ◽  
Yuuki Kitanaka ◽  
Yuji Noguchi ◽  
Jun Akedo ◽  
Masaru Miyayama
Keyword(s):  
Single Crystals ◽  
Oxygen Pressure ◽  
Spontaneous Polarization ◽  
High Performance ◽  
Sodium Titanate ◽  
Bismuth Sodium Titanate ◽  
Flux Method ◽  
Saturated Polarization ◽  
High Oxygen Pressure ◽  
Bismuth Sodium

(Bi0.5Na0.5)TiO3 (BNT) single crystals were grown by flux method at a high oxygen pressure (Po2) of 1 MPa, and their polarization properties were investigated. BNT single crystals exhibited a saturated polarization hysteresis with a remanent polarizations (Pr) of 31 μC/cm2 along [100]c, 44 μC/cm2 along [110]c and 54 μC/cm2 along [111]c. These results show that spontaneous polarization of BNT is approximately 55 mC/cm2 or larger.

Ferroelectric Properties and Domain Clamping of (Bi0.5Na0.5)TiO3 Single Crystals Grown under High-Oxygen-Pressure Atmosphere

2013 ◽  
Vol 566 ◽  
pp. 29-33
Author(s):  
Yuuki Kitanaka ◽  
Hiroaki Onozuka ◽  
Yuji Noguchi ◽  
Masaru Miyayama
Keyword(s):  
Single Crystals ◽  
Oxygen Pressure ◽  
High Performance ◽  
Ferroelectric Properties ◽  
Piezoresponse Force Microscopy ◽  
High Oxygen ◽  
Force Microscopy ◽  
High Oxygen Pressure ◽  
Growth Method ◽  
Measured Polarization

Top-seeded solution growth method under high-oxygen-pressure atmosphere has been developed for obtaining high-performance and large-sized single crystals of ferroelectric (Bi0.5Na0.5)TiO3 (BNT). Crystals grown at 1000 °C at a Po2 of 0.9 MPa exhibited a well-saturated hysteresis with a remanent polarization of 34 μC/cm2 and a coercive field of 22 kV/cm along <100>cubic. The spontaneous polarization of BNT along <111>cubic is estimated to be 59 μC/cm2 from the measured polarization properties along <100>cubic of the crystals obtained. Domain observations using piezoresponse force microscopy revealed that the degraded performance of BNT crystals grown at a low Po2 is attributed to unswitched 71° domains remaining even after applying a high electric field to the crystals .

High-Performance Bi0.5Na0.5TiO3Single Crystals Grown by High-Oxygen-Pressure Flux Method

2008 ◽  
Vol 47 (9) ◽  
pp. 7623-7629 ◽  
Author(s):  
Katsuya Yamamoto ◽  
Muneyasu Suzuki ◽  
Yuji Noguchi ◽  
Masaru Miyayama
Keyword(s):  
Oxygen Pressure ◽  
High Performance ◽  
High Oxygen ◽  
Flux Method ◽  
High Oxygen Pressure

Ferroelectric and Piezoelectric Properties of Bi4Ti3O12 Single Crystals Grown by Top-Seeded Solution Growth Method at High Oxygen Pressure

2011 ◽  
Vol 485 ◽  
pp. 73-76
Author(s):  
Yuuki Kitanaka ◽  
Yuji Noguchi ◽  
Masaru Miyayama
Keyword(s):  
Single Crystals ◽  
Oxygen Pressure ◽  
High Performance ◽  
Piezoresponse Force Microscopy ◽  
High Oxygen ◽  
Solution Growth ◽  
Force Microscopy ◽  
High Oxygen Pressure ◽  
Growth Method ◽  
Top Seeded Solution Growth

High-performance single crystals of ferroelectric Bi4Ti3O12 (BiT) have been successfully obtained via the top-seeded solution growth under high oxygen pressure (Po2) atmosphere. Crystals grown at 960°C at a Po2 of 0.9 MPa exhibited a well-saturated hysteresis loop with a remanent polarization of 48 mC/cm2 and a coercive field of 29 kV/cm. The results of piezoresponse force microscopy indicate that polarization switching is accomplished throughout the BiT crystals obtained. Electric-field-induced strain measurements along the a axis yield a piezoelectric constant d11* of 37 pm/V for BiT.

Preparation and Properties of Bi0.5Na0.5TiO3-Ba (Hf,Ti)TiO3 Lead-Free Piezoelectric Ceramics

2007 ◽  
Vol 334-335 ◽  
pp. 957-960
Author(s):  
Hu Yong Tian ◽  
Wan Ping Chen ◽  
D.Y. Wang ◽  
Y. Wang ◽  
J.T. Zeng ◽  
...  
Keyword(s):  
Piezoelectric Coefficient ◽  
Sodium Titanate ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
Synthesis Process ◽  
Bismuth Sodium Titanate ◽  
Promising Candidate ◽  
Device Applications ◽  
The Relationship ◽  
Bismuth Sodium

Lead-free piezoelectric ceramics based on bismuth sodium titanate (BNT) -barium hafnate titanate (BHT) were prepared by a two-step synthesis process. The final BNT-BHT ceramics sintered at 1180oC for 2 h in air showed a perovskite structure with high density. The morphotropic phase boundaries (MPB) were found in BNT based piezoelectric ceramics with 8~10 wt% BHT in composites. In the case of Bi0.5Na0.5TiO3-0.08BaHf0.05Ti0.95O3 ceramics, a maximum piezoelectric coefficient d33 of 122.6 pC/N was obtained. The remnant polarization (Pr) and coercive field (Ec) were measured and the relationship between ferroelectricity and the BHT fraction in the compounds was investigated. The BNT-BHT ceramics were expected to be a new and promising candidate for lead-free piezoelectric device applications.

Boosting electrostriction and strain performance in bismuth sodium titanate-based ceramics via introducing low tolerance factor chemical modifier

2019 ◽  
Vol 291 ◽  
pp. 156-166 ◽  
Author(s):  
Naimat Ullah Khan ◽  
Aman Ullah ◽  
Amir Ullah ◽  
Muhammad Yaqoob Khan ◽  
Tae Heon Kim ◽  
...  
Keyword(s):  
Sodium Titanate ◽  
Tolerance Factor ◽  
Chemical Modifier ◽  
Bismuth Sodium Titanate ◽  
Bismuth Sodium
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