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Piticescu RR, Slobozeanu AE, Valsan SN, Ciobota CF, Ghita AN, Motoc AM, Chiriac S, Prakasam M. Hydrothermal Synthesis of Nanocrystalline ZrO 2-8Y 2O 3-xLn 2O 3 Powders (Ln = La, Gd, Nd, Sm): Crystalline Structure, Thermal and Dielectric Properties. MATERIALS 2021; 14:ma14237432. [PMID: 34885586 PMCID: PMC8658870 DOI: 10.3390/ma14237432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 11/26/2021] [Accepted: 11/26/2021] [Indexed: 11/16/2022]
Abstract
Zirconium dioxide (ZrO2) is one of the ceramic materials with high potential in many areas of modern technologies. ZrO2 doped with 8 wt.% (~4.5 mol%) Y2O3 is a commercial powder used for obtaining stabilized zirconia materials (8 wt.% YSZ) with high temperature resistance and good ionic conductivity. During recent years it was reported the co-doping with multiple rare earth elements has a significant influence on the thermal, mechanical and ionic conductivity of zirconia, due complex grain size segregation and enhanced oxygen vacancies mobility. Different methods have been proposed to synthesize these materials. Here, we present the hydrothermal synthesis of 8 wt.% (~4.5 mol%) YSZ co-doped with 4, 6 and 8 wt.% La2O3, Nd2O3, Sm2O3 and Gd2O3 respectively. The crystalline phases formed during their thermal treatment in a large temperature range were analyzed by X-ray diffraction. The evolution of phase composition vs. thermal treatment temperatures shows as a major trend the formation at temperatures >1000 °C of a cubic solid solutions enriched in the rare earth oxide used for co-doping as major phase. The first results on the thermal conductivities and impedance measurements on sintered pellets obtained from powders co-doped with 8 wt.% Y and 6% Ln (Ln = La, Nd, Sm and Gd) and the corresponding activation energies are presented and discussed. The lowest thermal conductivity was obtained for La co-doped 8 wt.% YSZ while the lowest activation energy for ionic conduction for Gd co-doped 8 wt.% YSZ materials.
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Affiliation(s)
- Radu-Robert Piticescu
- National R&D Institute for Non-Ferrous and Rare Metals, INCDMNR-IMNR, 102 Biruintei Blvd., 077145 Pantelimon, Romania; (S.N.V.); (C.F.C.); (A.-N.G.); (A.M.M.); (S.C.)
- Correspondence: (R.-R.P.); (A.E.S.)
| | - Anca Elena Slobozeanu
- National R&D Institute for Non-Ferrous and Rare Metals, INCDMNR-IMNR, 102 Biruintei Blvd., 077145 Pantelimon, Romania; (S.N.V.); (C.F.C.); (A.-N.G.); (A.M.M.); (S.C.)
- Correspondence: (R.-R.P.); (A.E.S.)
| | - Sorina Nicoleta Valsan
- National R&D Institute for Non-Ferrous and Rare Metals, INCDMNR-IMNR, 102 Biruintei Blvd., 077145 Pantelimon, Romania; (S.N.V.); (C.F.C.); (A.-N.G.); (A.M.M.); (S.C.)
| | - Cristina Florentina Ciobota
- National R&D Institute for Non-Ferrous and Rare Metals, INCDMNR-IMNR, 102 Biruintei Blvd., 077145 Pantelimon, Romania; (S.N.V.); (C.F.C.); (A.-N.G.); (A.M.M.); (S.C.)
| | - Andreea-Nicoleta Ghita
- National R&D Institute for Non-Ferrous and Rare Metals, INCDMNR-IMNR, 102 Biruintei Blvd., 077145 Pantelimon, Romania; (S.N.V.); (C.F.C.); (A.-N.G.); (A.M.M.); (S.C.)
| | - Adrian Mihail Motoc
- National R&D Institute for Non-Ferrous and Rare Metals, INCDMNR-IMNR, 102 Biruintei Blvd., 077145 Pantelimon, Romania; (S.N.V.); (C.F.C.); (A.-N.G.); (A.M.M.); (S.C.)
| | - Stefania Chiriac
- National R&D Institute for Non-Ferrous and Rare Metals, INCDMNR-IMNR, 102 Biruintei Blvd., 077145 Pantelimon, Romania; (S.N.V.); (C.F.C.); (A.-N.G.); (A.M.M.); (S.C.)
| | - Mythili Prakasam
- CNRS, Université de Bordeaux, ICMCB, UMR 5026, 87 Avenue du Docteur Schweitzer, CEDEX, 33608 Pessac, France;
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King A, Singh R, Nayak BB. Phase and photoluminescence analysis of dual-color emissive Eu3+-doped ZrO2 nanoparticles for advanced security features in anti-counterfeiting. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127715] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Influence of Stabilizing Ion Content on the Structure, Photoluminescence and Biological Properties of Zr1–xEuxO2–0.5x Nanoparticles. CRYSTALS 2020. [DOI: 10.3390/cryst10111038] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Quasi-spherical nanoparticles of ZrO2 containing EuO1.5 from 2 to 15 mol.% were synthesized from the chlorides of the corresponding metals under hydrothermal conditions. The structural changes of Zr1–xEuxO2–0.5x (x = 0.02 ÷ 0.15) nanoparticles depending on the content of europium (III) ions were studied using the complementary methods (X-ray diffraction, electron microdiffraction, Raman and photoluminescence spectroscopy). It was shown that increasing the Eu3+ concentration in the Zr1–xEuxO2–0.5x nanoparticles leads to a transition from the equilibrium monoclinic zirconia phase to metastable tetragonal and cubic polymorphic modifications. In this case, the size of the nanoparticles decreases from 11.5 nm to 9 nm; the specific surface area grows from 80.2 to 111.3 m2/g, and the electrokinetic potential increases monotonously from −8.7 to 16.3 mV. The evolution of the phase composition of Zr1–xEuxO2-0.5x nanoparticles from monoclinic to tetragonal/cubic allomorphs with an increase in the molar fraction of stabilizer ions was correlated with changes in the sublevel structure of 5D0 → 7F2 and 5D0 → 7F4 optical transitions for Eu3+ in the luminescence spectra. Besides, for the nanoparticles obtained by hydrothermal synthesis from chlorides, the quantum efficiency does not exceed 3%. According to the M.T.T. assay, as a result of three-day human fibroblast cultivation in the aqueous dispersion of Zr1–xEuxO2–0.5x (x = 0.02 ÷ 0.15) nanoparticles, the proliferation activity of the cells is maintained, indicating that they do not have cytotoxic properties. Such nanoparticles can be used in organic–inorganic composites for medical applications in order to strengthen the polymer scaffolds and visualize changes in their structure within time.
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Ponnilavan V, Kannan S. Structural, optical tuning, and mechanical behavior of zirconia toughened alumina through europium substitutions. J Biomed Mater Res B Appl Biomater 2018; 107:1170-1179. [PMID: 30281921 DOI: 10.1002/jbm.b.34210] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 06/29/2018] [Accepted: 07/06/2018] [Indexed: 12/20/2022]
Abstract
The structural and optical features of zirconia toughened alumina (ZTA) due to the assorted range of Eu3+ substitutions are demonstrated. The characterization studies affirm the pivotal role of Eu3+ on the improved structural stability of ZTA and associated tetragonal zirconia (t-ZrO2 ) → cubic zirconia (c-ZrO2 ) transformation. Eu3+ prefers accommodation at the lattice sites of ZrO2 and their gradual accumulation induces t- → c-ZrO2 transition. Beyond the substitution limit, Eu3+ reacts with Al2 O3 to form EuAlO3 . Optical studies validate typical Eu3+ emissions, and further, the emission spectrum also predicts the symmetry of Eu3+ coordination at the ZrO2 lattice. Uniform distribution of ZrO2 and Al2 O3 grains throughout the microstructures are evident from the morphological analysis. Further, the influence of Eu3+ on the enhanced mechanical stability of ZTA is ensured from indentation technique. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 107B: 1170-1179, 2019.
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Affiliation(s)
| | - Sanjeevi Kannan
- Centre for Nanoscience and Technology, Pondicherry University, 605014, Puducherry, India
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Sun J, Wang J, Huang W, Hui Y, Zhou X, Li L, Jiang J, Deng L, Niu Y, Dong S, Cao X. Influence of synthesis temperatures on the crystalline grain growth and morphology of lanthanum magnesium hexaaluminate. J RARE EARTH 2017. [DOI: 10.1016/j.jre.2017.05.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Li Y, Lei R, Xu S. Combination of Ionic Liquid and Sonication: a Fast, Mild and Green Way to Fabricate Europium-doped Lanthanide Nanophosphates. ChemistrySelect 2016. [DOI: 10.1002/slct.201600816] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yinyan Li
- College of Materials Science and Engineering; China Jiliang University; Hangzhou 310018 China
| | - Ruoshan Lei
- College of Materials Science and Engineering; China Jiliang University; Hangzhou 310018 China
| | - Shiqing Xu
- College of Materials Science and Engineering; China Jiliang University; Hangzhou 310018 China
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WU H, LI Y, WANG Y, ZHANG P, RAO W. Study on preparation, microstructure and luminescent properties of Er-ZrO2 layer. J RARE EARTH 2016. [DOI: 10.1016/s1002-0721(16)60121-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Hydrothermal synthesis of lanthanide (hydr)oxide micro/nanorods in presence of tetrabutylammonium hydroxide. J RARE EARTH 2016. [DOI: 10.1016/s1002-0721(16)60070-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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