---
_id: '9878'
abstract:
- lang: eng
text: (K,Na)NbO3 ceramics have attracted much attention as lead-free piezoelectric
materials with high piezoelectric properties. High-quality (K,Na)NbO3 ceramics
can be sintered using KNbO3 and NaNbO3 powders synthesized by a hydrothermal method.
In this study, to enhance the quality factor of the ceramics, high-power ultrasonic
irradiation was employed during the hydrothermal method, which led to a reduction
in the particle size of the resultant powders.
author:
- first_name: G.
full_name: Isobe, G.
last_name: Isobe
- first_name: Takafumi
full_name: Maeda, Takafumi
last_name: Maeda
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Takeshi
full_name: Morita, Takeshi
last_name: Morita
citation:
ama: Isobe G, Maeda T, Bornmann P, Hemsel T, Morita T. Synthesis of lead-free piezoelectric
powders by ultrasonic-assisted hydrothermal method and properties of sintered
(K0.48Na0.52)NBO3 ceramics. Ultrasonics, Ferroelectrics, and Frequency Control,
IEEE Transactions on. 2014;61(2):225-230. doi:10.1109/TUFFC.2014.6722608
apa: Isobe, G., Maeda, T., Bornmann, P., Hemsel, T., & Morita, T. (2014). Synthesis
of lead-free piezoelectric powders by ultrasonic-assisted hydrothermal method
and properties of sintered (K0.48Na0.52)NBO3 ceramics. Ultrasonics, Ferroelectrics,
and Frequency Control, IEEE Transactions On, 61(2), 225–230. https://doi.org/10.1109/TUFFC.2014.6722608
bibtex: '@article{Isobe_Maeda_Bornmann_Hemsel_Morita_2014, title={Synthesis of lead-free
piezoelectric powders by ultrasonic-assisted hydrothermal method and properties
of sintered (K0.48Na0.52)NBO3 ceramics}, volume={61}, DOI={10.1109/TUFFC.2014.6722608},
number={2}, journal={Ultrasonics, Ferroelectrics, and Frequency Control, IEEE
Transactions on}, author={Isobe, G. and Maeda, Takafumi and Bornmann, Peter and
Hemsel, Tobias and Morita, Takeshi}, year={2014}, pages={225–230} }'
chicago: 'Isobe, G., Takafumi Maeda, Peter Bornmann, Tobias Hemsel, and Takeshi
Morita. “Synthesis of Lead-Free Piezoelectric Powders by Ultrasonic-Assisted Hydrothermal
Method and Properties of Sintered (K0.48Na0.52)NBO3 Ceramics.” Ultrasonics,
Ferroelectrics, and Frequency Control, IEEE Transactions On 61, no. 2 (2014):
225–30. https://doi.org/10.1109/TUFFC.2014.6722608.'
ieee: G. Isobe, T. Maeda, P. Bornmann, T. Hemsel, and T. Morita, “Synthesis of lead-free
piezoelectric powders by ultrasonic-assisted hydrothermal method and properties
of sintered (K0.48Na0.52)NBO3 ceramics,” Ultrasonics, Ferroelectrics, and Frequency
Control, IEEE Transactions on, vol. 61, no. 2, pp. 225–230, 2014.
mla: Isobe, G., et al. “Synthesis of Lead-Free Piezoelectric Powders by Ultrasonic-Assisted
Hydrothermal Method and Properties of Sintered (K0.48Na0.52)NBO3 Ceramics.” Ultrasonics,
Ferroelectrics, and Frequency Control, IEEE Transactions On, vol. 61, no.
2, 2014, pp. 225–30, doi:10.1109/TUFFC.2014.6722608.
short: G. Isobe, T. Maeda, P. Bornmann, T. Hemsel, T. Morita, Ultrasonics, Ferroelectrics,
and Frequency Control, IEEE Transactions On 61 (2014) 225–230.
date_created: 2019-05-20T13:10:14Z
date_updated: 2019-09-16T10:53:17Z
department:
- _id: '151'
doi: 10.1109/TUFFC.2014.6722608
intvolume: ' 61'
issue: '2'
keyword:
- Q-factor
- ceramics
- crystal growth from solution
- particle size
- piezoelectric materials
- potassium compounds
- powders
- sintering
- sodium compounds
- ultrasonic effects
- (K0.48Na0.52)NbO3
- KNbO3 powders
- NaNbO3 powders
- high-power ultrasonic irradiation
- lead-free piezoelectric materials
- lead-free piezoelectric powders
- particle size reduction
- piezoelectric properties
- quality factor
- sintered (K0.48Na0.52)NbO3 ceramics
- sintering
- ultrasonic-assisted hydrothermal method
- Acoustics
- Ceramics
- Lead
- Piezoelectric materials
- Powders
- Radiation effects
- Transducers
language:
- iso: eng
page: 225-230
publication: Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions
on
publication_identifier:
issn:
- 0885-3010
quality_controlled: '1'
status: public
title: Synthesis of lead-free piezoelectric powders by ultrasonic-assisted hydrothermal
method and properties of sintered (K0.48Na0.52)NBO3 ceramics
type: journal_article
user_id: '55222'
volume: 61
year: '2014'
...
---
_id: '9788'
abstract:
- lang: eng
text: 'A hydrothermal method utilizes a crystallization process in the solution
so that the pure and high-quality powders can be realized. Sintering from the
hydrothermal KNbO3 and NaNbO3 powders, a high-dense lead-free piezoelectric (K,Na)NbO3
ceramics could be obtained (density: 98.8\%). Concerning about the g33 constant,
high value as large as commercial PZT ceramics was measured. Therefore, the hydrothermal
(K,Na)NbO3 ceramics is usable for the sensors and the energy harvesting devices.
To demonstrate the (K,Na)NbO3 ceramics, a hydrophone sensor was fabricated and
evaluated.'
author:
- first_name: Takafumi
full_name: Maeda, Takafumi
last_name: Maeda
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Takeshi
full_name: Morita, Takeshi
last_name: Morita
citation:
ama: 'Maeda T, Bornmann P, Hemsel T, Morita T. Piezoelectric applications of hydrothermal
lead-free (K0.48Na0.52)NbO3 ceramics. In: Ultrasonics Symposium (IUS), 2012
IEEE International. ; 2012:194-195. doi:10.1109/ULTSYM.2012.0048'
apa: Maeda, T., Bornmann, P., Hemsel, T., & Morita, T. (2012). Piezoelectric
applications of hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics. In Ultrasonics
Symposium (IUS), 2012 IEEE International (pp. 194–195). https://doi.org/10.1109/ULTSYM.2012.0048
bibtex: '@inproceedings{Maeda_Bornmann_Hemsel_Morita_2012, title={Piezoelectric
applications of hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics}, DOI={10.1109/ULTSYM.2012.0048},
booktitle={Ultrasonics Symposium (IUS), 2012 IEEE International}, author={Maeda,
Takafumi and Bornmann, Peter and Hemsel, Tobias and Morita, Takeshi}, year={2012},
pages={194–195} }'
chicago: Maeda, Takafumi, Peter Bornmann, Tobias Hemsel, and Takeshi Morita. “Piezoelectric
Applications of Hydrothermal Lead-Free (K0.48Na0.52)NbO3 Ceramics.” In Ultrasonics
Symposium (IUS), 2012 IEEE International, 194–95, 2012. https://doi.org/10.1109/ULTSYM.2012.0048.
ieee: T. Maeda, P. Bornmann, T. Hemsel, and T. Morita, “Piezoelectric applications
of hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics,” in Ultrasonics Symposium
(IUS), 2012 IEEE International, 2012, pp. 194–195.
mla: Maeda, Takafumi, et al. “Piezoelectric Applications of Hydrothermal Lead-Free
(K0.48Na0.52)NbO3 Ceramics.” Ultrasonics Symposium (IUS), 2012 IEEE International,
2012, pp. 194–95, doi:10.1109/ULTSYM.2012.0048.
short: 'T. Maeda, P. Bornmann, T. Hemsel, T. Morita, in: Ultrasonics Symposium (IUS),
2012 IEEE International, 2012, pp. 194–195.'
date_created: 2019-05-13T13:28:05Z
date_updated: 2022-01-06T07:04:20Z
department:
- _id: '151'
doi: 10.1109/ULTSYM.2012.0048
keyword:
- crystallisation
- hydrophones
- piezoceramics
- potassium compounds
- powder technology
- powders
- sensors
- sintering
- sodium compounds
- (K0.48Na0.52)NbO3
- KNbO3 powder
- NaNbO3 powder
- crystallization
- energy harvesting devices
- g33 constant
- hydrophone sensor
- hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics
- hydrothermal method
- piezoelectric applications
- sintering
- Materials
- Transducers
language:
- iso: eng
page: 194-195
publication: Ultrasonics Symposium (IUS), 2012 IEEE International
publication_identifier:
issn:
- 1948-5719
quality_controlled: '1'
status: public
title: Piezoelectric applications of hydrothermal lead-free (K0.48Na0.52)NbO3 ceramics
type: conference
user_id: '55222'
year: '2012'
...
---
_id: '9743'
abstract:
- lang: eng
text: The hydrothermal method enables the production of high-quality piezoelectric
materials. In this study, we propose to irradiate the reaction solutions with
ultrasonic power during the hydrothermal method to obtain a shorter reaction time
and a smooth film surface. A high-pressure reaction container for the ultrasonic
transducer was newly developed, and the ultrasonically-assisted hydrothermal method
was examined by using this container. The effect of ultrasonic assist on the synthesis
of lead-zirconate-titanate (PZT) thin films and (K,Na)NbO$_{3}$ powders was verified.
Thicker PZT film, thickness around 10 ${\mu}$m, could be obtained in one process,
and (K,Na)NbO$_{3}$ powder was synthesized in half the previous reaction time.
author:
- first_name: Ryo
full_name: Ageba, Ryo
last_name: Ageba
- first_name: Yoichi
full_name: Kadota, Yoichi
last_name: Kadota
- first_name: Takafumi
full_name: Maeda, Takafumi
last_name: Maeda
- first_name: Norihito
full_name: Takiguchi, Norihito
last_name: Takiguchi
- first_name: Takeshi
full_name: Morita, Takeshi
last_name: Morita
- first_name: Mutsuo
full_name: Ishikawa, Mutsuo
last_name: Ishikawa
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
citation:
ama: Ageba R, Kadota Y, Maeda T, et al. Ultrasonically-assisted Hydrothermal Method
for Ferroelectric Material Synthesis. Journal of Korean Physical Society.
2010;57(4):918-923. doi:10.3938/jkps.57.918
apa: Ageba, R., Kadota, Y., Maeda, T., Takiguchi, N., Morita, T., Ishikawa, M.,
… Hemsel, T. (2010). Ultrasonically-assisted Hydrothermal Method for Ferroelectric
Material Synthesis. Journal of Korean Physical Society, 57(4), 918–923.
https://doi.org/10.3938/jkps.57.918
bibtex: '@article{Ageba_Kadota_Maeda_Takiguchi_Morita_Ishikawa_Bornmann_Hemsel_2010,
title={Ultrasonically-assisted Hydrothermal Method for Ferroelectric Material
Synthesis}, volume={57}, DOI={10.3938/jkps.57.918},
number={4}, journal={Journal of Korean Physical Society}, author={Ageba, Ryo and
Kadota, Yoichi and Maeda, Takafumi and Takiguchi, Norihito and Morita, Takeshi
and Ishikawa, Mutsuo and Bornmann, Peter and Hemsel, Tobias}, year={2010}, pages={918–923}
}'
chicago: 'Ageba, Ryo, Yoichi Kadota, Takafumi Maeda, Norihito Takiguchi, Takeshi
Morita, Mutsuo Ishikawa, Peter Bornmann, and Tobias Hemsel. “Ultrasonically-Assisted
Hydrothermal Method for Ferroelectric Material Synthesis.” Journal of Korean
Physical Society 57, no. 4 (2010): 918–23. https://doi.org/10.3938/jkps.57.918.'
ieee: R. Ageba et al., “Ultrasonically-assisted Hydrothermal Method for Ferroelectric
Material Synthesis,” Journal of Korean Physical Society, vol. 57, no. 4,
pp. 918–923, 2010.
mla: Ageba, Ryo, et al. “Ultrasonically-Assisted Hydrothermal Method for Ferroelectric
Material Synthesis.” Journal of Korean Physical Society, vol. 57, no. 4,
2010, pp. 918–23, doi:10.3938/jkps.57.918.
short: R. Ageba, Y. Kadota, T. Maeda, N. Takiguchi, T. Morita, M. Ishikawa, P. Bornmann,
T. Hemsel, Journal of Korean Physical Society 57 (2010) 918–923.
date_created: 2019-05-13T09:35:33Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
doi: 10.3938/jkps.57.918
intvolume: ' 57'
issue: '4'
keyword:
- Hydrothermal method
- High-power ultrasonic
- PZT thin film
- Lead-free piezoelectric materials
language:
- iso: eng
page: 918-923
publication: Journal of Korean Physical Society
publication_identifier:
issn:
- 1948-5719
quality_controlled: '1'
status: public
title: Ultrasonically-assisted Hydrothermal Method for Ferroelectric Material Synthesis
type: journal_article
user_id: '55222'
volume: 57
year: '2010'
...
---
_id: '9744'
abstract:
- lang: eng
text: Direct ultrasound irradiation is advantageous to increase the efficiency of
the hydrothermal method which can be used for the production of piezoelectric
thin films and lead free piezoelectric ceramics. To apply ultrasound directly
to the process transducer prototypes were developed regarding the boundary conditions
of the hydrothermal method. LiNbO$_{3}$ and PIC 181 were proven as feasible materials
for high temperature resistant transducers ($\geq 200^\circ C$). Resistance of
the transducers horn against the corrosive mineralizer was achieved by using Hastelloy
C-22. The efficiency of the ultrasound assisted hydrothermal method depends on
the generated sound field. Impedance and sound field measurements have shown that
the sound field depends on the filling level and the position and design of the
transducer.
author:
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Littmann, Walter
last_name: Littmann
- first_name: Ryo
full_name: Ageba, Ryo
last_name: Ageba
- first_name: Yoishi
full_name: Kadota, Yoishi
last_name: Kadota
- first_name: Takeshi
full_name: Morita, Takeshi
last_name: Morita
citation:
ama: Bornmann P, Hemsel T, Littmann W, Ageba R, Kadota Y, Morita T. Ultrasonic Transducer
for the Hydrothermal Method. Journal of Korean Physical Society. 2010;57(4):1122.
doi:10.3938/jkps.57.1122
apa: Bornmann, P., Hemsel, T., Littmann, W., Ageba, R., Kadota, Y., & Morita,
T. (2010). Ultrasonic Transducer for the Hydrothermal Method. Journal of Korean
Physical Society, 57(4), 1122. https://doi.org/10.3938/jkps.57.1122
bibtex: '@article{Bornmann_Hemsel_Littmann_Ageba_Kadota_Morita_2010, title={Ultrasonic
Transducer for the Hydrothermal Method}, volume={57}, DOI={10.3938/jkps.57.1122},
number={4}, journal={Journal of Korean Physical Society}, author={Bornmann, Peter
and Hemsel, Tobias and Littmann, Walter and Ageba, Ryo and Kadota, Yoishi and
Morita, Takeshi}, year={2010}, pages={1122} }'
chicago: 'Bornmann, Peter, Tobias Hemsel, Walter Littmann, Ryo Ageba, Yoishi Kadota,
and Takeshi Morita. “Ultrasonic Transducer for the Hydrothermal Method.” Journal
of Korean Physical Society 57, no. 4 (2010): 1122. https://doi.org/10.3938/jkps.57.1122.'
ieee: P. Bornmann, T. Hemsel, W. Littmann, R. Ageba, Y. Kadota, and T. Morita, “Ultrasonic
Transducer for the Hydrothermal Method,” Journal of Korean Physical Society,
vol. 57, no. 4, p. 1122, 2010.
mla: Bornmann, Peter, et al. “Ultrasonic Transducer for the Hydrothermal Method.”
Journal of Korean Physical Society, vol. 57, no. 4, 2010, p. 1122, doi:10.3938/jkps.57.1122.
short: P. Bornmann, T. Hemsel, W. Littmann, R. Ageba, Y. Kadota, T. Morita, Journal
of Korean Physical Society 57 (2010) 1122.
date_created: 2019-05-13T09:37:56Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
doi: 10.3938/jkps.57.1122
intvolume: ' 57'
issue: '4'
keyword:
- High-temperature transducer
- Hydrothermal method
- Lithium-niobate transducer
language:
- iso: eng
page: '1122'
publication: Journal of Korean Physical Society
publication_identifier:
issn:
- 1948-5719
quality_controlled: '1'
status: public
title: Ultrasonic Transducer for the Hydrothermal Method
type: journal_article
user_id: '55222'
volume: 57
year: '2010'
...
---
_id: '9758'
abstract:
- lang: eng
text: As a lead-free piezoelectric ceramics, (K,Na)NbO$_{3}$ is a promising material
because of its good piezoelectric properties. In this study, (K$_{1-x}$Na$_{x}$)NbO$_{3}$
ceramics were synthesized from a KNbO$_{3}$ and NaNbO$_{3}$ mixture powder prepared
by the hydrothermal reaction. The hydrothermal reaction enables the production
of high quality powder for the ceramics fabrication process. To obtain (K$_{1-x}$Na$_{x}$)NbO$_{3}$
ceramics, these two powders KNbO$_{3}$ and NaNbO$_{3}$ were mixed and then sintered
together. X-Ray diffraction analysis revealed that the solid solution ceramics
(K$_{1-x}$Na$_{x}$)NbO$_{3}$ was produced by the sintering process. The K/Na ratio
in (K$_{1-x}$Na$_{x}$)NbO$_{3}$ ceramics was optimized for the best piezoelectric
properties. The optimized forms was (K$_{0.48}$Na$_{0.52}$)NbO$_{3}$, which showed
the following piezoelectric properties; k$_{33}$=0.56, d$_{33}$=114pC/N. In addition,
the ferroelectric properties, P$_{r}$=7.72mC/cm$^{2}$, E$_{c}$=857V/mm, and the
Curie temperature T$_{c}$=420$_{o}$C were also measured.
author:
- first_name: Takafumi
full_name: Maeda, Takafumi
last_name: Maeda
- first_name: Norihito
full_name: Takiguchi, Norihito
last_name: Takiguchi
- first_name: Takeshi
full_name: Morita, Takeshi
last_name: Morita
- first_name: Mutsuo
full_name: Ishikawa, Mutsuo
last_name: Ishikawa
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
citation:
ama: Maeda T, Takiguchi N, Morita T, Ishikawa M, Hemsel T. Hydrothermal (K1-xNax)NbO3
Lead-free Piezoelectric Ceramics. Journal of Korean Physical Society. 2010;57(4):924-928.
doi:10.3938/jkps.57.924
apa: Maeda, T., Takiguchi, N., Morita, T., Ishikawa, M., & Hemsel, T. (2010).
Hydrothermal (K1-xNax)NbO3 Lead-free Piezoelectric Ceramics. Journal of Korean
Physical Society, 57(4), 924–928. https://doi.org/10.3938/jkps.57.924
bibtex: '@article{Maeda_Takiguchi_Morita_Ishikawa_Hemsel_2010, title={Hydrothermal
(K1-xNax)NbO3 Lead-free Piezoelectric Ceramics}, volume={57}, DOI={10.3938/jkps.57.924},
number={4}, journal={Journal of Korean Physical Society}, author={Maeda, Takafumi
and Takiguchi, Norihito and Morita, Takeshi and Ishikawa, Mutsuo and Hemsel, Tobias},
year={2010}, pages={924–928} }'
chicago: 'Maeda, Takafumi, Norihito Takiguchi, Takeshi Morita, Mutsuo Ishikawa,
and Tobias Hemsel. “Hydrothermal (K1-XNax)NbO3 Lead-Free Piezoelectric Ceramics.”
Journal of Korean Physical Society 57, no. 4 (2010): 924–28. https://doi.org/10.3938/jkps.57.924.'
ieee: T. Maeda, N. Takiguchi, T. Morita, M. Ishikawa, and T. Hemsel, “Hydrothermal
(K1-xNax)NbO3 Lead-free Piezoelectric Ceramics,” Journal of Korean Physical
Society, vol. 57, no. 4, pp. 924–928, 2010.
mla: Maeda, Takafumi, et al. “Hydrothermal (K1-XNax)NbO3 Lead-Free Piezoelectric
Ceramics.” Journal of Korean Physical Society, vol. 57, no. 4, 2010, pp.
924–28, doi:10.3938/jkps.57.924.
short: T. Maeda, N. Takiguchi, T. Morita, M. Ishikawa, T. Hemsel, Journal of Korean
Physical Society 57 (2010) 924–928.
date_created: 2019-05-13T10:19:43Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
doi: 10.3938/jkps.57.924
intvolume: ' 57'
issue: '4'
keyword:
- Lead-free piezoelectric material
- KNN
- Hydrothermal method
language:
- iso: eng
page: 924-928
publication: Journal of Korean Physical Society
publication_identifier:
issn:
- 1948-5719
quality_controlled: '1'
status: public
title: Hydrothermal (K1-xNax)NbO3 Lead-free Piezoelectric Ceramics
type: journal_article
user_id: '55222'
volume: 57
year: '2010'
...