Effects of La doping on diffused ferroelectric phase transition, electric and dielectric properties of lead-free SrBi2Ta2O9 ceramics
Citric acid-assisted method was used to synthesize pure polycrystalline La-doped SrBi2Ta2O9 powders which were uniaxially pressed and sintered under different conditions. La doping of SrBi2Ta2O9 resulted in the shortening of Ta-O bond lengths, but increased the unit cell volume and decreased the cry...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
University of Novi Sad
2024-09-01
|
| Series: | Processing and Application of Ceramics |
| Subjects: | |
| Online Access: | https://doiserbia.nb.rs/img/doi/1820-6131/2024/1820-61312403290A.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850283024744185856 |
|---|---|
| author | Afqir Mohamed Fasquelle Didier Tachafine Amina Elaatmani Mohamed Meng Yingzhi Daoud Mohamed |
| author_facet | Afqir Mohamed Fasquelle Didier Tachafine Amina Elaatmani Mohamed Meng Yingzhi Daoud Mohamed |
| author_sort | Afqir Mohamed |
| collection | DOAJ |
| description | Citric acid-assisted method was used to synthesize pure polycrystalline La-doped SrBi2Ta2O9 powders which were uniaxially pressed and sintered under different conditions. La doping of SrBi2Ta2O9 resulted in the shortening of Ta-O bond lengths, but increased the unit cell volume and decreased the crystallite size. The effect of sintering process on dielectric properties was studied in order to find optimal sintering conditions. Dielectric loss, measured at room temperature, increases when sintering temperature rises from 1100 to 1200°C, as well as when sintering time increases from 6 to 9 h. Thus, further investigation was performed on the sample sintered at 1100°C for 6 h. The obvious change in ε′ around TC and diffusive phase transition, pronounced for the ceramics with higher La content, were characteristic of the doped ceramics. The diffused ferroelectric phase transition behaviour is caused by structural disorder at the Sr-sites (Sr, Bi and La cations) in the Bi2O2 layers and perovskite blocks. The electrical conductivity increases steadily at lower temperatures (below 200 °C), but shows a strong temperature- and frequency-dependent trend at higher frequencies. La-doping decreases conductivity by hindering charge carriers’ long-distance mobility. |
| format | Article |
| id | doaj-art-76aab56c093f49599ce4b553dc38b82c |
| institution | OA Journals |
| issn | 1820-6131 2406-1034 |
| language | English |
| publishDate | 2024-09-01 |
| publisher | University of Novi Sad |
| record_format | Article |
| series | Processing and Application of Ceramics |
| spelling | doaj-art-76aab56c093f49599ce4b553dc38b82c2025-08-20T01:47:51ZengUniversity of Novi SadProcessing and Application of Ceramics1820-61312406-10342024-09-0118329029810.2298/PAC2403290AEffects of La doping on diffused ferroelectric phase transition, electric and dielectric properties of lead-free SrBi2Ta2O9 ceramicsAfqir Mohamed0Fasquelle Didier1https://orcid.org/0000-0002-1947-1860Tachafine Amina2Elaatmani Mohamed3Meng Yingzhi4Daoud Mohamed5Laboratoire des Sciences des Matériaux et optimisation des procédés, Faculté des Sciences Semlalia, Université Cadi Ayyad, Marrakech, MoroccoUnité de Dynamique et Structure des Matériaux Moléculaires, Université du Littoral Côte d’Opale, Calais, FranceUnité de Dynamique et Structure des Matériaux Moléculaires, Université du Littoral Côte d’Opale, Calais, FranceLaboratoire des Sciences des Matériaux et optimisation des procédés, Faculté des Sciences Semlalia, Université Cadi Ayyad, Marrakech, MoroccoGuilin University of Technology, Guilin, ChinaLaboratoire des Sciences des Matériaux et optimisation des procédés, Faculté des Sciences Semlalia, Université Cadi Ayyad, Marrakech, MoroccoCitric acid-assisted method was used to synthesize pure polycrystalline La-doped SrBi2Ta2O9 powders which were uniaxially pressed and sintered under different conditions. La doping of SrBi2Ta2O9 resulted in the shortening of Ta-O bond lengths, but increased the unit cell volume and decreased the crystallite size. The effect of sintering process on dielectric properties was studied in order to find optimal sintering conditions. Dielectric loss, measured at room temperature, increases when sintering temperature rises from 1100 to 1200°C, as well as when sintering time increases from 6 to 9 h. Thus, further investigation was performed on the sample sintered at 1100°C for 6 h. The obvious change in ε′ around TC and diffusive phase transition, pronounced for the ceramics with higher La content, were characteristic of the doped ceramics. The diffused ferroelectric phase transition behaviour is caused by structural disorder at the Sr-sites (Sr, Bi and La cations) in the Bi2O2 layers and perovskite blocks. The electrical conductivity increases steadily at lower temperatures (below 200 °C), but shows a strong temperature- and frequency-dependent trend at higher frequencies. La-doping decreases conductivity by hindering charge carriers’ long-distance mobility.https://doiserbia.nb.rs/img/doi/1820-6131/2024/1820-61312403290A.pdfla-doped srbi2ta2o9citric acid assisted synthesissinteringelectric and dielectric properties |
| spellingShingle | Afqir Mohamed Fasquelle Didier Tachafine Amina Elaatmani Mohamed Meng Yingzhi Daoud Mohamed Effects of La doping on diffused ferroelectric phase transition, electric and dielectric properties of lead-free SrBi2Ta2O9 ceramics Processing and Application of Ceramics la-doped srbi2ta2o9 citric acid assisted synthesis sintering electric and dielectric properties |
| title | Effects of La doping on diffused ferroelectric phase transition, electric and dielectric properties of lead-free SrBi2Ta2O9 ceramics |
| title_full | Effects of La doping on diffused ferroelectric phase transition, electric and dielectric properties of lead-free SrBi2Ta2O9 ceramics |
| title_fullStr | Effects of La doping on diffused ferroelectric phase transition, electric and dielectric properties of lead-free SrBi2Ta2O9 ceramics |
| title_full_unstemmed | Effects of La doping on diffused ferroelectric phase transition, electric and dielectric properties of lead-free SrBi2Ta2O9 ceramics |
| title_short | Effects of La doping on diffused ferroelectric phase transition, electric and dielectric properties of lead-free SrBi2Ta2O9 ceramics |
| title_sort | effects of la doping on diffused ferroelectric phase transition electric and dielectric properties of lead free srbi2ta2o9 ceramics |
| topic | la-doped srbi2ta2o9 citric acid assisted synthesis sintering electric and dielectric properties |
| url | https://doiserbia.nb.rs/img/doi/1820-6131/2024/1820-61312403290A.pdf |
| work_keys_str_mv | AT afqirmohamed effectsofladopingondiffusedferroelectricphasetransitionelectricanddielectricpropertiesofleadfreesrbi2ta2o9ceramics AT fasquelledidier effectsofladopingondiffusedferroelectricphasetransitionelectricanddielectricpropertiesofleadfreesrbi2ta2o9ceramics AT tachafineamina effectsofladopingondiffusedferroelectricphasetransitionelectricanddielectricpropertiesofleadfreesrbi2ta2o9ceramics AT elaatmanimohamed effectsofladopingondiffusedferroelectricphasetransitionelectricanddielectricpropertiesofleadfreesrbi2ta2o9ceramics AT mengyingzhi effectsofladopingondiffusedferroelectricphasetransitionelectricanddielectricpropertiesofleadfreesrbi2ta2o9ceramics AT daoudmohamed effectsofladopingondiffusedferroelectricphasetransitionelectricanddielectricpropertiesofleadfreesrbi2ta2o9ceramics |