Integrated Ferroelectrics最新文献

{"title":"Classical to Relaxor Ferroelectric Transformation of Lanthanum Modified BaTi _0.91 Sn _0.09 O ₃ Ceramics","authors":"Wiwat Pattanakasem, Sasipohn Prasertpalichat, Pathit Premwichit, Naratip Vittayakorn, Theerachai Bongkarn","doi":"10.1080/10584587.2023.2234624","DOIUrl":"https://doi.org/10.1080/10584587.2023.2234624","url":null,"abstract":"Abstract Lead-free Ba1-xLaxTi0.91Sn0.09O3 (BLTS) ceramics with x = 0, 0.01, 0.03 and 0.05, were prepared by the traditional solid-state sintering method with calcination and sintering temperatures of 1200 °C for 2 h and 1400 °C for 4 h, respectively. X-ray diffraction (XRD) measurements revealed that all the BLTS ceramics had pure perovskite structures with no detectable impurities. When x = 0 and 0.01, the ceramics exhibited coexisting orthorhombic (O) and tetragonal (T) phases, while the orthorhombic (O), tetragonal (T) and cubic phase (C) were detected in the BLTS ceramics with x = 0.03 and 0.05, which the Rietveld refinement analysis confirmed. Furthermore, increasing x in the BLTS ceramics led to a large decrease in the average grain size (from 45.7 to 0.9 µm). A significant decrease in the remnant polarization (P r) accompanied by very slim hysteresis loops were observed for higher La (x ≥ 0.03) levels. This demonstrates that BLTS ceramics transition from classical ferroelectric to relaxor ferroelectric behavior due to changing occupancy of the A-site to La3+ from Ba2+.","PeriodicalId":13686,"journal":{"name":"Integrated Ferroelectrics","volume":"215 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136317723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"White Light Emission and Judd-Ofelt Analysis of Dy ³⁺ Doped Mixed Alkali Borate Glass for W-LEDs Material","authors":"Nawarut Jarucha, Yotsakit Ruangtaweep, Poomirat Nawarat, Paisan Kanthang, Pichet Limsuwan, Hong Joo Kim, Jakrapong Kaewkhao, Thanapong Sareein","doi":"10.1080/10584587.2023.2234618","DOIUrl":"https://doi.org/10.1080/10584587.2023.2234618","url":null,"abstract":"AbstractThe Dy3+ doped lithium sodium potassium borate glasses with white light-emitting were prepared by the melt quenching technique. In this work, optical, photoluminescence properties and Judd-Ofelt analysis of borate glasses have been investigated. For optical properties, Dy3+ doped glasses showed the absorption in visible and near-infrared region, which originate from 6H15/2 ground state to higher state. While the luminescence properties of Dy3+ doped glasses, the emission spectra were presented more intense at 484 nm (blue light) and 574 nm (yellow light) which are essential for white light emitting materials, whilst decay time decrease with an increase of Dy2O3 contents. The emission intensity of Dy3+ doped glasses were enhanced by adding Dy2O3 concentrations until 0.5 mol%, after that the emission intensities were decreased due to the concentration quenching effect. Judd-Ofelt is analyzed by using the absorption and photoluminescence results, The stimulated emission cross-section has been investigated in this work. The CIE 1931 chromaticity investigation shows that Dy3+ doped glass emitted light with white color. Hence, these glasses may be suitable candidates for use in W-LEDs material.Keywords: Alkali borate glassdysprosiumJudd-Ofeltwhite light emission AcknowledgmentsT.S. would like to acknowledge supports from Faculty of Science and Technology, Rajamangala University of Technology Phra Nakhon (RMUTP) and Thailand Science Research and Innovation (TSRI). Our thanks are also grateful to the Center of Excellence in Glass Technology and Materials Science (CEGM), Faculty of Science and Technology, Nakhon Pathom Rajabhat University.Disclosure StatementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis project is funded by National Research Council of Thailand (NRCT) (Contract No. N41A650404) and Cerntek Company Limited.","PeriodicalId":13686,"journal":{"name":"Integrated Ferroelectrics","volume":"217 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136262007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of La-Doped HfO ₂ Films on Dielectric Properties by Sol-Gel Method","authors":"Suparat Tongpeng, Suttipong Wannapaiboon, Penphitcha Amonpattaratkit, Praphaphon Silawong, Pattanaphong Janphuang, Rungrueang Pattanakul, Sukanda Jiansirisomboon","doi":"10.1080/10584587.2023.2234607","DOIUrl":"https://doi.org/10.1080/10584587.2023.2234607","url":null,"abstract":"Abstract HfO2 and La-doped HfO2 with 20, 40, 50, and 60 mol% were deposited on silicon wafers by spin-coating technique. The crystallization process was annealed temperature at 600 °C. Then, characterization techniques of XRD, AFM, SEM, Full-field XRF imaging, and XAS were applied to reveal structural morphology, local structure, grain, distribution, etc. This study aims to investigate the effect of doping La into the HfO2 system on surface formation, microstructure, and dielectric properties. According to the results, RMS surface roughness, and grain size increased relative to La concentration levels. These films demonstrated homogeneous, low surface roughness, and crack-free. The XRD confirms the existence of the monoclinic phase in pure HfO2 and the mixture phase of the monoclinic and orthorhombic phases in La-doped HfO2 films. Increasing La concentration caused the structural transformation, the XAS of La L3 -edge indicating that lanthanum remained in the HfO2 system. Dielectric response based on interface-phase polarization was improved with La content from 0 mol% to 60 mol%. Compared with HfO2 film, the dielectric constant of La-doped HfO2 films was increased and dielectric loss was decreased.","PeriodicalId":13686,"journal":{"name":"Integrated Ferroelectrics","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136318963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the Physical, Optical and Luminescence Properties of the Cr-Doped Recycled Waste Glass","authors":"P. Mangthong, N. Srisittipokakun, R. Rajaramakrishna, J. Kaewkhao","doi":"10.1080/10584587.2023.2234575","DOIUrl":"https://doi.org/10.1080/10584587.2023.2234575","url":null,"abstract":"AbstractThe rapid economic growth in recent years has led to the use of glass material in many activities, resulting in a large amount of glass waste. The efficient use of waste glass recycling has gained increasing attention. Researchers propose a method for recycling waste glass to reduce glass manufacturing costs and investigate the physical, optical, and luminescence properties of chromium oxide-doped glass with the stoichiometry of (35-x) B2O3: 35SiO2 (use waste glass as SiO2): 12Na2O: 7.9CaO: 0.1Sb2O3: 10BaO: xCr2O3 when x = 0.00 to 0.05 mol%. Glass was synthesized using the melt quenching at 1,200 degrees Celsius for 3 h. Archimedes’ principle and the Abbe refractometer were used to calculating density and refractive index decrease with the addition of 0.01 mol% of Cr3+ concentration. At room temperature, absorption spectra were analyzed using a UV-VIS-NIR spectrometer exhibiting two broadband at 438 and 625 nm intense bands, and the luminescence properties of the Cr3+ glasses system were investigated using an excitation wavelength of 567 nm, with luminescence peaks observed around 750 nm. CIE L* a* b* shows the green color.Keywords: Recycled waste glasschromium oxidephysical propertiesoptical propertiesluminescence properties Disclosure StatementNo potential conflict of interest was reported by the author(s).Additional informationFundingThe authors would like to thank under the project number N41A640252 This research project is supported by National Research Council of Thailand (NRCT), Thailand Science Research and Innovation (TSRI), The authors would like to thank the centre of Excellence in Glass Technology and Materials Science (CEGM), NPRU and Gemories Thailand Co., Ltd for providing the facilities.","PeriodicalId":13686,"journal":{"name":"Integrated Ferroelectrics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135245769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dielectric and Improved Energy-Storage Properties in A-Site Nd ³⁺ Doped Lead-Free 0.88NaNbO ₃ -0.12Sr _0.7 Bi _0.2 TiO ₃ Ceramics","authors":"Pathit Premwichit, Natthakan Jaitha, Sanu Kumar Gupta, David P. Cann, Sasipohn Prasertpalichat","doi":"10.1080/10584587.2023.2234564","DOIUrl":"https://doi.org/10.1080/10584587.2023.2234564","url":null,"abstract":"AbstractSodium niobate (NaNbO3)-based antiferroelectric (AFE) ceramics have received significant attention for energy storage applications because of their good performance, low cost, and nontoxicity. However, the existence of the antiferroelectric P phase at room temperature causes large hysteresis, resulting in reduced energy storage efficiency. In this study, 0.88NaNbO3–0.12Sr0.7Bi0.2TiO3 ceramics doped with Nd3+ (i.e., 0.88Na1-3xNdxNbO3-0.12Sr0.7Bi0.2TiO3) at x = 0.0 − 0.025 were prepared via conventional solid-state mixed oxide route. The XRD data showed that all samples exhibited an orthorhombic structure. With increasing Nd3+ doping content, the antiferroelectric P (Pbma) phase to R (Pnma) phase transition temperature (TP-R) shifted to lower temperatures. Consistent with the dielectric properties, a transition to a relaxor-like slim P-E loop indicative of an AFE R phase was observed at the composition x ≥ 0.01. This led to an increase in both the recoverable energy-storage density (Wrec) and efficiency (η) with an increasing amount of Nd3+ doping level. The maximum recoverable energy storage density (Wrec = 0.54 J/cm3) and high energy storage efficiency (η = 93%) were observed at x = 0.025 under an applied electric field of 100 kV/cm. In addition, the optimum composition at x = 0.025 also exhibited excellent temperature stability from 25 °C to 150 °C. This research demonstrates that the NN–SBT–xNd system has the potential for use for high-energy-density pulsed power capacitor applications.Keywords: Lead-free ceramicsNaNbO3energy storage properties Disclosure StatementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was financially supported by The National Science, Research and Innovation Fund (NSRF) through Naresuan University (R2565B059).","PeriodicalId":13686,"journal":{"name":"Integrated Ferroelectrics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135195394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase Formation, Morphology and Electrical Properties of Lead-Free BNBLT-xBSN Ceramics Synthesized via the Solid-State Combustion Technique","authors":"Bhoowadol Thatawong, Naratip Vittayakorn, Aurawan Rittidech, Theerachai Bongkarn","doi":"10.1080/10584587.2023.2234563","DOIUrl":"https://doi.org/10.1080/10584587.2023.2234563","url":null,"abstract":"AbstractLead-free 1-x(Bi0.47Na0.47Ba0.06)0.95La0.05TiO3-xBa(Sn0.70Nb0.24)O3 (BNBLT-xBSN) ceramics with x = 0, 0.01, 0.02, 0.03 and 0.04 mol.% were synthesized by the solid-state combustion technique with a calcination temperature of 750 °C for 2 h and a sintering temperature of 1150 °C for 2 h. The effect of BSN substitution on the phase formation, microstructure, dielectric, ferroelectric and energy storage properties of the BNBLT ceramics was investigated. With the substitution of BSN, the coexisting rhombohedral (R) and tetragonal (T) phases transformed into coexisting R and cubic (C) phase, verified by Rietveld refinement. The C phase increased with increased BSN content. The average grain size decreased from 1.14 to 0.89 µm when x increased to 0.03 and then increased to 0.96 µm. The measured density and maximum dielectric constant (εm) tended to increase from 5.44 to 5.87 g/cm3 and 1800 to 1942 when x increased to 0.03, then decreased to 5.25 g/cm3 and 1501, respectively. The remanent polarization (Pr) and coercive field (Ec) decreased when x increased to 0.03. The 0.97BNBLT-0.03BSN ceramic exhibited the lowest energy loss density (Wloss ∼ 0.10 J/cm3) and the highest energy-storage efficiency (η ∼ 77.3%) measured under an electric field of 70 kV/cm.Keywords: BNBLT-xBSNcombustiondielectricferroelectricenergy storage AcknowledgmentsThe authors thank the Department of Physics, Faculty of Science, Naresuan University for their supporting facilities. Thanks are also given to Asst. Prof. Dr. Kyle V. Lopin for his help in editing the manuscript.Disclosure StatementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by Naresuan University (NU) and National Science, Research and Innovation Fund (NSRF) with Grant No. R2567B001. The works of N. Vittayakorn was funded by KMITL under Grant No. KREF116501.","PeriodicalId":13686,"journal":{"name":"Integrated Ferroelectrics","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135198892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temperature Effect on Fatigue Behavior of BCZT Ceramics and Defects Analysis by Synchrotron X-Ray Absorption Spectroscopy","authors":"Dhanunjaya Munthala, Thita Sonklin, Natthawadi Buatip, Parichat Pomyai, Pattanaphong Janphuang, Soodkhet Pojprapai","doi":"10.1080/10584587.2023.2234587","DOIUrl":"https://doi.org/10.1080/10584587.2023.2234587","url":null,"abstract":"AbstractThis paper presents the effect of temperature on the electrical fatigue behavior of barium calcium zirconate titanate (Ba0.85Ca0.15Zr0.1Ti0.9O3) ceramics. Fatigue degradation and its practical applications are a significant problem in piezo/ferroelectric ceramics. Fatigue-induced domain orientations, physical damage or microcracking, and defects were studied using, X-ray diffraction (XRD), synchrotron X-ray absorption spectroscopy (XAS), and scanning electron microscope (SEM) techniques. The remnant polarization (Pr) decreased with the number of fatigue cycles, and the rate at which the decrease occurred was different for different fatigue temperatures. The weak and strong domain wall pinning effects played a major role in the Pr value with respect to the fatigue cycles. The sharp rise of Ec value at 5 × 103 cycles and the abrupt decrease of Ec values after 5 × 104 cycles could be due to the field screening effect and heat recovery of pinned domains. The abrupt decrease of Pr values after 5 × 105 cycles could be due to physical damage near the electrode interface region, and the same physical damage decreased with the increase in fatigue temperature. The near-edge X-ray absorption fine structure (NEXAFS) study was utilized to evaluate the oxygen-related defect concentration.Keywords: Lead-free ceramicstemperature-dependent fatigueoxygen defectsdepolarization of domainsNEXAFS AcknowledgmentsDr. Julia Glaum, Department of Materials Science and Engineering, Norwegian University of Science and Technology, Norway, is acknowledged for her useful discussion. Dr. Siriporn Tigunta and Mr. Mongkol Kongtungmon, School of Ceramic Engineering, Suranaree University of Technology, are acknowledged for their technical support.Disclosure StatementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work is supported by the SUT Research and Development Fund.","PeriodicalId":13686,"journal":{"name":"Integrated Ferroelectrics","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135245895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bright Green Emission of Tb ³⁺ Doped Lithium Sodium Potassium Borate Glasses for Photonic Application","authors":"N. Jarucha, Y. Ruangtaweep, P. Meejitpaisan, P. Kanthang, N. Wongdamnern, P. Limsuwan, H. J. Kim, J. Kaewkhao, T. Sareein","doi":"10.1080/10584587.2023.2234580","DOIUrl":"https://doi.org/10.1080/10584587.2023.2234580","url":null,"abstract":"AbstractThe melt-quenching approach was implemented to create terbium-doped lithium sodium potassium borate glasses (LNKBTb). Archimedes’ principle, absorption and luminescence spectra, including CIE chromaticity were used to characterize the properties of glasses. Terbium in glasses absorbs photon in the visible and near infrared ranges. The intense green emission at 544 nm was generated by the terbium 5D4 to 7F5 transition when excited with ultraviolet–visible (UV–Vis) light. The emission intensities of LNKBTb glasses increased with increasing terbium concentrations up to 4 mol%, after which they decreased, resulting in the concentration quenching effect, whereas decay time decreases as Tb2O3 content increases. In CIE 1931, the overall color of emission is green. May bring can continue to develop to use as a photonic material in green light sources and lasers.Keywords: Borate glassesCIEluminescenceterbium AcknowledgmentsThe authors would like to thank all graduate students and co-researchers in the research laboratory of the Center of Excellence in Glass Technology and Materials Science, and there is also the Industrial Materials Science Division Faculty of Science and Technology Rajamangala University of Technology Phra Nakhon.Disclosure StatementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis project is funded by the National Research Council of Thailand (NRCT) (Contract No. N41A650404) and CERNTEK COMPANY LIMITED.","PeriodicalId":13686,"journal":{"name":"Integrated Ferroelectrics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135245904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physical, Optical, and Photoluminescence Properties of Cr ₂ O ₃ in Borosilicate Glasses","authors":"N. Singkiburin, N. Mahingsa, N. Srisittipokakun, N. Luewarasirikul, R. Rajaramakrishna, S. Kothan, C. Kedkaew, J. Kaewkhao","doi":"10.1080/10584587.2023.2234583","DOIUrl":"https://doi.org/10.1080/10584587.2023.2234583","url":null,"abstract":"AbstractThe glass samples (35-x)B2O3:35SiO2:12Na2O:7.9CaO:0.1Sb2O3:10BaO:xCr2O3 with a variation of Cr2O3 content were successfully fabricated and characterized for solid-state lighting material applications. The results showed the most suitable composition within the range of study at 0.02 mol% of Cr2O3. This composition gave higher reflection loss (RL), lower oxide polarizability, and lower molar refractivity. The Commission International de I'Eclairage (CIE) chromaticity coordinates confirmed a strong orange color emission. Hence, this suggests that the 0.02 mol% Cr2O3 glass is a good candidate and cost-effective for orange-emitting solid-state lighting material applications. This study will be a useful literature source for further development in this field.Keywords: Borosilicate glassCr2O3 concentrationluminescence propertiesTanabe–Sugano diagram AcknowledgmentsJ. Kaewkhao and N. Srisittipokakun would like to thanks Thailand Science Research and Innovation (TSRI) for partially supporting this research.Disclosure StatementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis research has been funded by Research Council of Thailand (NRCT) and Gemories Thailand Co. Ltd. (Project number N41A650403). This research was partially supported by Chiang Mai University.","PeriodicalId":13686,"journal":{"name":"Integrated Ferroelectrics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135245923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of La Doping on Local Structure of Hafnium Oxide Studied by X-Ray Absorption Spectroscopy","authors":"Suparat Tongpeng, Suttipong Wannapaiboon, Pattanaphong Janphuang, Sukanda Jiansirisomboon","doi":"10.1080/10584587.2023.2234560","DOIUrl":"https://doi.org/10.1080/10584587.2023.2234560","url":null,"abstract":"AbstractHfO2-based films prepared by the integration of the sol-gel method and spin-coating procedure were used as the study system to investigate the influence of La doping by varying the La contents of 20, 40, 50, and 60 wt%. GIXRD, XANES, and EXAFS measurements were performed to analyze phase formation, crystal structure, and local structure of the films. The XANES data of the Hf L3-edge show no significant difference with respect to an increase in La content, indicating a considerable stability of the hafnium ion in the +4 oxidation state. Moreover, the EXAFS spectrum shows that the coordination number of Hf4+ is seven and the Hf–O bond length is ∼2.11 Å, which additionally confirms the formation of monoclinic HfO2 structure. The contributions of the second coordination shells, which are assigned to the Hf–Hf and Hf–La bonds, become well-structured with increasing La concentration in the HfO2 structure. However, the study suggests that the La-doped concentration affects the phase transformation from monoclinic to tetragonal and finally orthorhombic phase, leading to the presence of ferroelectric materials.Keywords: La-doped HfO2thin filmsphase transitionXANESEXAFS AcknowledgmentsThis work was supported by the Suranaree University of Technology (SUT) by Office of the Higher Education Commission under NRU Project of Thailand and Synchrotron Light Research Institute (Public Organization), SLRI, Thailand at BL 6A for all facilities and financial supports. The authors wish to thank the Synchrotron Light Research Institute for the provision of beamtime for GIXRD and XAS at BL1.1W. Dr. Prae Chirawatkul and Dr. Chatree Saiyasombat of BL1.1W are acknowledged for their fruitful discussion and assistance during the experiment. The figures in this article were created using Adobe Illustrator, SketchUp, BioRender, CaRIne v.3, and Microsoft PowerPoint.Disclosure StatementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.","PeriodicalId":13686,"journal":{"name":"Integrated Ferroelectrics","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135246587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}