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Journal articles on the topic 'La2Zr2O7'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Jasik, Anna, Grzegorz Moskal, Marta Mikuśkiewicz, et al. "Oxidation Behavior of the Monolayered La2Zr2O7, Composite La2Zr2O7 + 8YSZ, and Double-Ceramic Layered La2Zr2O7/La2Zr2O7 + 8YSZ/8YSZ Thermal Barrier Coatings." Materials 13, no. 14 (2020): 3242. http://dx.doi.org/10.3390/ma13143242.

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The degradation process of thermal barrier coatings (TBCs) such as monolayered La2Zr2O7, composite 50% La2Zr2O7 + 50% 8YSZ, and double-ceramic layer (DCL) La2Zr2O7/50% La2Zr2O7 + 50% 8YSZ/8YSZ was investigated. Coatings were deposited using the atmospheric plasma spraying (APS) process (ceramic layer and bond-coat) on the Ni-based superalloy substrate with Ni-22Cr-10Al-1Y bond-coat. The thickness of the ceramic top-coats in all cases were 300 µm. In the case of La2Zr2O7/8YSZ, the internal sublayer was built from 8YSZ powder whereas the outer from La2Zr2O7. Between both sublayers’ “composite” a 50% La2Zr2O7 + 50% 8YSZ zone was present. The “composite” 50% La2Zr2O7 + 50% 8YSZ TBC system was sprayed from two different feedstock powders with equal weight ratios. In the first part of the investigation, the microstructural characterization of the TBCs was presented. The main goals were related to the characterization of the degradation processes in different TBC systems with special emphasis on the phenomenon in the thermally grown oxide (TGO) zone related to oxidation, and the phenomenon related to phase stability in ceramic top-coats as related to temperature influence. The oxidation test was carried out in air at 1100 °C for 500 h. In the second step of the investigation, the numerical simulation of the monolayered TBC 8YSZ and La2Zr2O7 systems was analyzed from the stress distribution point of view. Additionally, the two-layered TBC coating of the DCL type was also analyzed.

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2

Zhu, Shi Zhen, Long Chen, Qiang Xu, Ling Liu, and Zhuang Ma. "Influence of Adding ZrO₂on the Properties of La₂Zr₂O₇ Ceramic." Key Engineering Materials 602-603 (March 2014): 335–39. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.335.

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La2Zr2O7 as the thermal barrier coating material draws more and more attention because of its greater thermal physical properties than YSZ, while its further application is restricted by its poor mechanical properties. In this paper, certain ZrO2 is added into the La2Zr2O7 ceramics in order to improve its mechanical properties. La2Zr2O7 ceramic superfine powder was synthesized by the co-precipitation method and samples of La2Zr2O7-xZrO2(x=0, 10%, 20%, 30%)were prepared by pressureless sintering process. The microstructure and properties of the samples were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), three-point bend tests, SENB, laser impulse thermal conductivity instrument and high-temperature expansion instrument. Owing to the partial solid solubility in the La2Zr2O7-xZrO2 ceramics, ZrO2 exists in the form of m-ZrO2 and t-ZrO2. With the addition of ZrO2, the mechanical properties of La2Zr2O7-xZrO2 ceramics first increase, then decrease. When the addition amount of ZrO2 reaches 20%, the fracture toughness comes to the greatest value 2.41 MPa·m1/2. When the addition amount of ZrO2 reaches 10%, the bending strength comes to the greatest value 202.4 MPa. The thermal conductivity of the La2Zr2O7-xZrO2 ceramics is lower than YSZ. The thermal conductivity of the La2Zr2O7-xZrO2 ceramic decrease at 1400 °C as the addition amount of ZrO2 increases, resulting from the higher intrinsic thermal conductivity of ZrO2 than that of La2Zr2O7. The thermal expansion coefficient of the La2Zr2O7-xZrO2 ceramics decreases slowly after about 350 °C and decrease rapidly at about 1000 °C, and then increase rapidly due to the transformation of m-ZrO2 to t-ZrO2.

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3

Tong, Yu Ping, Yu Qing Zhao, Hong Yuan Huo, and Hui Yang. "Synthesis、Structure and Catalytic Activity of TiO₂/ La₂Zr₂O₇ Nanocomposites." Advanced Materials Research 239-242 (May 2011): 2878–81. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.2878.

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TiO2/La2Zr2O7 composites were fabricated by sol-gel method. The composites were characterized by X-ray powder diffraction (XRD), Raman spectrum, scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDS) and Brunauer-Emmett-Teller (BET) nitrogen adsorption. The results showed that TiO2 was uniformly coated on the surface of La2Zr2O7 powders. The BET surface area of TiO2/La2Zr2O7 composites was 26.78 m2/g, which was larger than that of La2Zr2O7. Also, the photodegradation of methyl orange was used to evaluate its photocatalytic property. It was found that TiO2/La2Zr2O7 composites showed good photocatalytic activity and the decomposition of methyl orange had basically completed within 30 min.

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4

Jin, Lei, Pei Zhong Li, Chun Zhu Jiang, Guo Dong Zhou, Hai Bin Zhou, and Chun Wang. "Effect of Sc, Y, Yb, Hf, Ce on Mechanical and Thermal Properties of La₂Zr₂O₇: First-Principles Calculations." Advanced Materials Research 1120-1121 (July 2015): 85–93. http://dx.doi.org/10.4028/www.scientific.net/amr.1120-1121.85.

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In order to achieve better understanding of the effect of dopant (Sc, Y, Yb, Hf and Ce) on elastic stiffness and thermal properties of La2Zr2O7. The related calculations were performed using the first principles methods. The predicted elastic constants indicate that La2Zr2O7 and oxidations-La2Zr2O7 (oxidations refer to Sc2O3, Y2O3, Yb2O3, HfO2 and CeO2) are mechanically stable structures. And then the numerical estimates of bulk modulus, shear modulus, Young’s modulus were performed using the calculated elastic constants. After these mechanical properties are obtained, sound velocity, Debye temperature and theoretical minimum thermal conductivity of La2Zr2O7 and oxidations-La2Zr2O7 are calculated and analyzed in detail. The available experimental results and our calculations are basically satisfactory. The calculated results indicate that Young’s modulus, mean sound velocity, Debye temperature and minimum thermal conductivity of La2Zr2O7 can be decreased by dopants. CeO2 has extraordinary ability to decrease thermal conductivity in these dopant oxidations.

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5

An, Li Qiong, Akihiko Ito, and Takashi Goto. "Fabrication of Transparent La₂Zr₂O₇ by Reactive Spark Plasma Sintering." Key Engineering Materials 484 (July 2011): 135–38. http://dx.doi.org/10.4028/www.scientific.net/kem.484.135.

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Transparent La2Zr2O7 with cubic pyrochlore structure was first fabricated by reactive spark plasma sintering using commercially available La2O3 and ZrO2 powders. Single phase of pyrochlore La2Zr2O7 was obtained at a sintering temperature of 1673 K and sintering pressure at 100 MPa for 2.7 ks. The La2Zr2O7 sintered body had a uniform grain size of 1.5 m and exhibited 68% transmittance in the wavelength range of 4–6 m.

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6

Huang, Kaijin, Wei Li, Kai Pan, Xin Lin, and Aihua Wang. "High Temperature Oxidation and Thermal Shock Properties of La2Zr2O7 Thermal Barrier Coatings Deposited on Nickel-Based Superalloy by Laser-Cladding." Coatings 10, no. 4 (2020): 370. http://dx.doi.org/10.3390/coatings10040370.

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In order to reduce the difficulty and cost of manufacturing and improve the high temperature oxidation and thermal shock properties of nickel-based superalloy, a thin La2Zr2O7 thermal barrier coating without bond coat was successfully prepared by laser-cladding using La2Zr2O7 powders on a nickel-based superalloy substrate. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) methods were used to characterize the microstructure of the coating. The high temperature oxidation and thermal shock properties of the coating were evaluated by the air isothermal oxidation method at 1100 °C for 110 h and thermal cycling method at 25~1100 °C, respectively. The results show that the coating is mainly composed of La2Zr2O7 phase. The oxidation weight gain rate of the coating is about two-thirds of that of the substrate, and the first crack thermal shock lifetime of the coating is about 1.67 times of that of the substrate. The oxidation products of the coating are mainly Fe2O3, Cr2O3, NiCr2O4, Nb2O5 and La2Zr2O7. The existence of La2Zr2O7 phase in the coating is the main reason for the improvement of its oxidation resistance at 1100 °C and its thermal shock resistance at 25~1100 °C.

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7

Xu, Qiang, Wei Pan, Chun Lei Wan, Long Hao Qi, He Zhuo Miao, and Fu Chi Wang. "A Promising LaSmZr₂O₇ Ceramic with Pyrochlore Structure for Thermal Barrier Coatings." Key Engineering Materials 368-372 (February 2008): 1328–30. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1328.

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Based on La2Zr2O7 ceramic for thermal barrier coatings, LaSmZr2O7 ceramic doped with samarium ion was successfully prepared using solid state reaction method. The pellets were sintered at 1600°C for 10 hours in air. The phase structure, thermal conductivity and thermal expansion coefficient of LaSmZr2O7 ceramic and La2Zr2O7 ceramic were measured by XRD, laser-flash device, high-temperature dilatometry, respectively. The results show that the crystal structure of LaSmZr2O7 ceramic is not affected by the doped samarium ion in the zirconium lattice. The thermophysical results show that the thermal conductivity of the LaSmZr2O7 ceramic is lower than that of La2Zr2O7 ceramic, while the thermal expansion coefficient is higher than that of La2Zr2O7 ceramic. These results indicate that LaSmZr2O7 ceramic or Ln2Zr2O7 ceramics doped with other rare earth ions could be candidate materials for future thermal barrier coatings.

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8

Zhang, Shounuo, Menglu Li, Haiyan Xiao, Zijiang Liu, and Xiaotao Zu. "A Comparative Study of Electron Radiation Responses of Pu2Zr2O7 and La2Zr2O7: An abinitio Molecular Dynamics Study." Materials 14, no. 6 (2021): 1516. http://dx.doi.org/10.3390/ma14061516.

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In this study, the response of Pu2Zr2O7 and La2Zr2O7 to electronic radiation is simulated, employing an ab initio molecular dynamics method. It is shown that Pu2Zr2O7 undergoes a crystalline-to-amorphous structural transition with 0.3% electronic excitation, while for La2Zr2O7, the structural amorphization occurs with 1.2% electronic excitation. During the microstructural evolution, the anion disorder further drives cation disorder and eventually results in the structural amorphization of Pu2Zr2O7 and La2Zr2O7. The difference in responses to electron radiation between Pu2Zr2O7 and La2Zr2O7 mainly results from the strong correlation effects between Pu 5f electrons and the smaller band gap of Pu2Zr2O7. These results suggest that Pu2Zr2O7 is less resistant to amorphization under local ionization rates that produce a low level of electronic excitation, since the level of the concentration of excited electrons is relatively low in Pu2Zr2O7. The presented results will advance the understanding of the radiation damage effects of zirconate pyrochlores.

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9

Huang, Kaijin, Wei Li, Kai Pan, Xin Lin, and Aihua Wang. "Microstructure and Corrosion Properties of La2Zr2O7/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding." Coatings 11, no. 1 (2021): 101. http://dx.doi.org/10.3390/coatings11010101.

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In order to improve the seawater corrosion resistance of Inconel 718 superalloy, a La2Zr2O7/NiCoCrAlY thermal barrier coating corrosion resistant to 3.5 wt.% NaCl aqueous solution was prepared by laser cladding on Inconel 718 superalloy. X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and electrochemical techniques were used to study the microstructure and the corrosion performance of the coating in 3.5 wt.% NaCl solution. The results show that the thermal barrier coating is mainly composed of primary La2Zr2O7 phase and γ + laves/δ phase eutectic structure. The corrosion potential and corrosion current of the coating in 3.5 wt.% NaCl solution are higher and lower than that of the Inconel 718 substrate, respectively, indicating that the corrosion performance of the coating is better than that of the Inconel 718 substrate. The presence of La2Zr2O7 phase in the thermal barrier coating is the main reason for its corrosion resistance to 3.5 wt.% NaCl solution.

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10

Wang, Yang, Rishi Kumar, Justin Roller, and Radenka Maric. "Synthesis and Characterization of Nano-crystalline La2Zr2O7 Film by Reactive Spray Deposition Technology for Application in Thermal Barrier Coatings." MRS Advances 2, no. 28 (2017): 1519–25. http://dx.doi.org/10.1557/adv.2017.154.

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AbstractLanthanum zirconate (La2Zr2O7) nano-crystalline films with cubic structure have been successfully prepared by a facile synthesis approach called reactive spray deposition technology (RSDT). La2Zr2O7 nanoparticles are produced by combusting a precursor solution of lanthanum acetylacetonate hydrate and zirconium acetylacetonate dissolved in an organic solvent mixture. The nanoparticles formed during the combustion process are directly deposited onto the substrate. The composition and microstructure of the as-deposited films are extensively characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The thermal diffusivities of the films are investigated by the means of laser flash method.

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11

Lu, Yanxia, Qing Peng, and Chenguang Liu. "Ab Initio Investigation of Helium Mobility in La2Zr2O7 Pyrochlore." Crystals 11, no. 6 (2021): 667. http://dx.doi.org/10.3390/cryst11060667.

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The α-decay of incorporated actinides continuously produces helium, resulting in helium accumulation and causing security concerns for nuclear waste forms. The helium mobility is a key issue affecting the accumulation and kinetics of helium. The energy barriers and migration pathways of helium in a potential high-level nuclear waste forms, La2Zr2O7 pyrochlore, have been investigated in this work using the climbing image nudged elastic band method with density functional theory. The minimum energy pathway for helium to migrate in La2Zr2O7 is identified as via La–La interstitial sites with a barrier of 0.46 eV. This work may offer a theoretical foundation for further prospective studies of nuclear waste forms.

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12

Colombo, M. "Phase relations in ZrO2–La2Zr2O7–Y2Zr2O7system." British Ceramic Transactions 98, no. 6 (1999): 271–73. http://dx.doi.org/10.1179/096797899680570.

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13

Chen, Yan, Nina Orlovskaya, Nicholas Miller, et al. "La_1.97Sr_0.03Zr₂O₇ Pyrochlore Powder for Advanced Energy Application." Advances in Science and Technology 62 (October 2010): 56–60. http://dx.doi.org/10.4028/www.scientific.net/ast.62.56.

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Materials with A2B2O7 (pyrochlore) structure have received a significant attention for their applications as new protonic conductors and materials used in electronic devices. One of the unique synthesis routes for La2Zr2O7 (pyrochlore) powders is the glycine-nitrate combustion method, which shows superior properties of the synthesized powder by using glycine as a complexing agent. The Sr doped La2Zr2O7 powders in pure pyrochlore structure were produced using this approach. Selected characteristics of the synthesized powders, such as crystal structure, lattice parameters, crystallite size, the vibrational properties, the morphology of the particles, along with the specific surface area and particle size have been investigated. The dependence of some properties on annealing temperatures of the powders has been studied.

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14

Liu, Ling, Qiang Xu, Fu Chi Wang, and Hong Song Zhang. "Preparation and Thermophysical Properties of (La_0.4Sm_0.5Yb_0.1)₂(Zr_0.7Ce_0.3)₂O₇ Ceramic for Thermal Barrier Coatings." Key Engineering Materials 368-372 (February 2008): 1334–36. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1334.

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A complex rare-earth zirconate (La0.4Sm0.5Yb0.1)2(Zr0.7Ce0.3)2O7 powder for thermal barrier coatings (TBCs) was synthesized by coprecipitation method. The phase composition, microstructure and the thermophysical properties were investigated. XRD results revealed that single phase (La0.4Sm0.5Yb0.1)2(Zr0.7Ce0.3)2O7 with pyrochlore structure was prepared and the SEM result showed that the microstructure of the product was dense and no other phases existed among the particles. With the temperature increasing, the thermal expansion coefficient (CTE) of the ceramic increased, while the thermal conductivity decreased. The results indicated that CTE of the ceramic was slightly higher than that of La2Zr2O7 and the thermal conductivity of the ceramic was lower than that of La2Zr2O7. These results imply that (La0.4Sm0.5Yb0.1)2(Zr0.7Ce0.3)2O7 can be explored as the candidate material for the ceramic layer in TBCs system.

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15

Deviannapoorani, C., S. Ramakumar, N. Janani, and Ramaswamy Murugan. "Synthesis of lithium garnets from La2Zr2O7 pyrochlore." Solid State Ionics 283 (December 2015): 123–30. http://dx.doi.org/10.1016/j.ssi.2015.10.006.

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16

Tang, Huijuan, Haiyan Sun, Dairong Chen, and Xiuling Jiao. "Fabrication and characterization of nanostructured La2Zr2O7 fibers." Materials Letters 70 (March 2012): 48–50. http://dx.doi.org/10.1016/j.matlet.2011.11.111.

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17

Lian, J., L. M. Wang, R. G. Haire, K. B. Helean, and R. C. Ewing. "Ion beam irradiation in La2Zr2O7–Ce2Zr2O7 pyrochlore." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 218 (June 2004): 236–43. http://dx.doi.org/10.1016/j.nimb.2004.01.007.

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18

Labrincha, J. A., J. R. Frade, and F. M. B. Marques. "Protonic conduction in La2Zr2O7-based pyrochlore materials." Solid State Ionics 99, no. 1-2 (1997): 33–40. http://dx.doi.org/10.1016/s0167-2738(97)00198-7.

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19

Chernyshev, V. A. "Phonon Spectrum of La2Zr2O7: ab initio Calculation." Optics and Spectroscopy 127, no. 5 (2019): 825–31. http://dx.doi.org/10.1134/s0030400x19110067.

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20

Kido, Hiroyasu, Sridhar Komarneni, and Rustum Roy. "Preparation of La2Zr2O7 by Sol-Gel Route." Journal of the American Ceramic Society 74, no. 2 (1991): 422–24. http://dx.doi.org/10.1111/j.1151-2916.1991.tb06899.x.

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21

Huang, Zhong, Faliang Li, Chengpeng Jiao, et al. "Molten salt synthesis of La2Zr2O7 ultrafine powders." Ceramics International 42, no. 5 (2016): 6221–27. http://dx.doi.org/10.1016/j.ceramint.2016.01.004.

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22

Labrincha, J. A., J. R. Frade, and F. M. B. Marques. "La2Zr2O7 formed at ceramic electrode/YSZ contacts." Journal of Materials Science 28, no. 14 (1993): 3809–15. http://dx.doi.org/10.1007/bf00353183.

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23

Chen, Hongfei, Yanfeng Gao, Yun Liu, and Hongjie Luo. "Coprecipitation synthesis and thermal conductivity of La2Zr2O7." Journal of Alloys and Compounds 480, no. 2 (2009): 843–48. http://dx.doi.org/10.1016/j.jallcom.2009.02.081.

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24

Bian, Weibai, Yuanqing Chen, Xinni Tang, et al. "Effect of La/Zr ratio in the precursor solution on the properties of La2Zr2O7 and CeO2/La2Zr2O7 films." Journal of Sol-Gel Science and Technology 82, no. 2 (2017): 586–93. http://dx.doi.org/10.1007/s10971-017-4303-5.

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25

Radha, A. V., Sergey V. Ushakov, and Alexandra Navrotsky. "Thermochemistry of lanthanum zirconate pyrochlore." Journal of Materials Research 24, no. 11 (2009): 3350–57. http://dx.doi.org/10.1557/jmr.2009.0401.

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A thermodynamic study was carried out to resolve discrepancies in the enthalpy of formation and related parameters for lanthanum zirconate pyrochlore. The homogeneity field for single phase pyrochlore formation was determined to be ∼33–35 mol% La2O3 at 1500 °C. High-temperature oxide melt drop solution calorimetry was performed in sodium molybdate and lead borate solvents on three compositions ranging from La1.98Zr2.01O7 to La2.07Zr1.95O7. The enthalpy of formation from oxides at 25 °C, ΔH0f,ox, for stoichiometric lanthanum zirconate pyrochlore is −107.3 ± 5.1 kJ/mol, and the standard enthalpy of formation from elements, ΔH0f,el, is −4102.2 ± 6.0 kJ/mol. La2Zr2O7 pyrochlore was found by differential thermal analysis to be stable up to its melting point. The melting point and the fusion enthalpy of La2Zr2O7 pyrochlore were measured as 2295 ± 10 °C and ∼350 kJ/mol, respectively.

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26

Blaquera, Aimee Lorraine, Christine Mae Macalisang, John Carlo Palomares, Renz Marion Garcia, and Rinlee Butch M. Cervera. "XRD and SEM Analyses of Bulk Ga-Doped Li₇La₃Zr₂O₁₂Li- Ion Conducting Solid Electrolyte Prepared via Hot-Pressing Method." Materials Science Forum 998 (June 2020): 215–20. http://dx.doi.org/10.4028/www.scientific.net/msf.998.215.

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In this study, bulk lithium-ion conducting solid electrolyte of Ga-doped Li7La3Zr2O12 (Li7-3XGaxLa3Zr2O12) where x = 0.1 (Ga-LLZO) was prepared via hot pressing at 500 °C. Precursor powder for hot-pressing was prepared using conventional solid state reaction method. Planetary ball milling was employed to investigate the particle size effect on the structure and densification of hot-pressed samples. XRD patterns of the bulk hot-pressed sample revealed a crystalline phase of which the major peaks observed can be indexed to a cubic LLZO structure; however, a major impurity phase of La2Zr2O7 was observed for the ball-milled sample. Thermogravimetric and differential thermal analysis showed about 12% weight loss below 900 °C which may have affected the observed hot-pressing structure. Although lower density measurement and an impurity phase of La2Zr2O7 were observed for the ball-milled sample, ball-milling also resulted to a more homogeneous and finer particle size as shown by SEM images results.

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27

Islam, Q. A., S. Nag, and R. N. Basu. "Study of electrical conductivity of Ca-substituted La2Zr2O7." Materials Research Bulletin 48, no. 9 (2013): 3103–7. http://dx.doi.org/10.1016/j.materresbull.2013.04.081.

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28

Elkady, Mohammed Y., Ashraf A. Mohmed, A. M. E. Daher, Wafaa H. Saleh, S. Negm, and H. Mashaal. "Preparation of La2Zr2O7 ceramic from Egyptian black sand." Journal of Radiation Research and Applied Sciences 11, no. 1 (2018): 37–42. http://dx.doi.org/10.1016/j.jrras.2017.10.005.

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29

Ravi, G., Suresh Palla, J. R. Reddy, Naveen Kumar Veldurthi, B. Vijaya Kumar, and M. Vithal. "Photocatalytic and Conductivity Studies of Bi3+Substituted La2Zr2O7." International Journal of Green Nanotechnology 4, no. 3 (2012): 360–67. http://dx.doi.org/10.1080/19430892.2012.738145.

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30

Yu, Z. M., P. Odier, S. Morlens, et al. "Deposition of La2Zr2O7 film by chemical solution deposition." Journal of Sol-Gel Science and Technology 54, no. 3 (2010): 363–70. http://dx.doi.org/10.1007/s10971-010-2204-y.

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31

Guo, Xingye, Li Li, Hyeon-Myeong Park, James Knapp, Yeon-Gil Jung, and Jing Zhang. "Mechanical Properties of Layered La2Zr2O7 Thermal Barrier Coatings." Journal of Thermal Spray Technology 27, no. 4 (2018): 581–90. http://dx.doi.org/10.1007/s11666-018-0703-5.

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32

Sun, M. J., W. Q. Liu, H. B. Zhou, et al. "La2Zr2O7 Doping Effects on MOD-SmBCO-Coated Conductors." Journal of Superconductivity and Novel Magnetism 31, no. 11 (2018): 3679–83. http://dx.doi.org/10.1007/s10948-018-4634-7.

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33

Ren, C., H. L. Suo, M. Liu, et al. "Investigation on La2Zr2O7 multilayers by chemical solution deposition." Ceramics International 43, no. 6 (2017): 5041–46. http://dx.doi.org/10.1016/j.ceramint.2017.01.014.

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34

Hayakawa, I., and H. Kamizono. "Durability of an La2Zr2O7 waste form in water." Journal of Materials Science 28, no. 2 (1993): 513–17. http://dx.doi.org/10.1007/bf00357832.

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35

Xu, Zhen Hua, Li Min He, Feng Lu, and Ren De Mu. "Failure of the EB-PVD TBCs of Rare Earth Zirconates." Materials Science Forum 686 (June 2011): 561–68. http://dx.doi.org/10.4028/www.scientific.net/msf.686.561.

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Thermal barrier coatings (TBCs) have very important applications in gas turbines for higher thermal efficiency and protection of components at high temperature. TBCs of rare earth materials such as lanthanum zirconate (La2Zr2O7, LZ), lanthanum yttrium zirconate (3wt% Y2O3- La2Zr2O7, 3YLZ), lanthanum cerium zirconate (La2(Zr0.7Ce0.3)2O7, LZ7C3) were prepared by electron beam-physical vapor deposition (EB-PVD). The compositions, crystal structures, thermal expansion behaviors, cross-sectional morphologies and cyclic oxidation behaviors of these coatings were studied. These coatings have partially deviated from their original compositions due to the different evaporation rates of oxides, and the deviation could be reduced by properly controlling the deposition condition. The thermal expansion behavior of LZ coating can be largely improved after doping with 3wt% Y2O3 and CeO2. The excess La2O3, chemical incompatibilities of the ceramic coatings with thermally grown oxide (TGO) layers, the visible cracks initiation, propagation and extension, the abnormal oxidation of bond coat, and the thermal expansion mismatch between ceramic coatings and bond coat are the primary factors for the spallation of LZ, 3YLZ and LZ7C3 coatings.

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36

Breval, Else, Nichole Wonderling, and Joseph P. Dougherty. "X-ray powder diffraction data of A-formula lanthanum and titanium substituted lead zirconate." Powder Diffraction 18, no. 3 (2003): 252–62. http://dx.doi.org/10.1154/1.1596633.

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PLZT of the compositions 0≤L≤12, and 0≤T≤10 was studied in order to describe the structure of the phases as a function of composition. This range contains a mixed region with PLZT+La2Zr2O7, an orthorhombic, a rhombohedral (hexagonal) phase, a tetragonal phase, and a mixture of different PLZT phases. Each phase pure composition is described by X-ray diffraction.

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37

Matsumura, Yoshinori, Masaru Yoshinaka, Ken Hirota, and Osamu Yamaguchi. "Formation and sintering of La2Zr2O7 by the hydrazine method." Solid State Communications 104, no. 6 (1997): 341–45. http://dx.doi.org/10.1016/s0038-1098(97)00332-3.

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Mantz, Yves A., and Yuhua Duan. "Density-functional study of the La2Zr2O7 low-index surfaces." Surface Science 689 (November 2019): 121235. http://dx.doi.org/10.1016/j.susc.2018.04.010.

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39

Crocombette, J. P., and A. Chartier. "Spontaneous cationic Frenkel pair recombinations in lanthanum pyrozirconate (La2Zr2O7)." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 250, no. 1-2 (2006): 24–27. http://dx.doi.org/10.1016/j.nimb.2006.04.076.

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40

Björketun, Mårten E., Christopher S. Knee, B. Joakim Nyman, and Göran Wahnström. "Protonic defects in pure and doped La2Zr2O7 pyrochlore oxide." Solid State Ionics 178, no. 31-32 (2008): 1642–47. http://dx.doi.org/10.1016/j.ssi.2007.10.014.

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41

Nyman, B. Joakim, Mårten E. Björketun, and Göran Wahnström. "Substitutional doping and oxygen vacancies in La2Zr2O7 pyrochlore oxide." Solid State Ionics 189, no. 1 (2011): 19–28. http://dx.doi.org/10.1016/j.ssi.2011.01.013.

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42

Cloet, V., J. Feys, R. Hühne, S. Hoste, and I. Van Driessche. "Thin La2Zr2O7 films made from a water-based solution." Journal of Solid State Chemistry 182, no. 1 (2009): 37–42. http://dx.doi.org/10.1016/j.jssc.2008.08.031.

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43

Wang, X. J., H. Y. Xiao, X. T. Zu, and W. J. Weber. "A DFT+U study of cerium solubility in La2Zr2O7." Journal of Nuclear Materials 424, no. 1-3 (2012): 69–74. http://dx.doi.org/10.1016/j.jnucmat.2012.02.008.

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44

Saruhan, B., P. Francois, K. Fritscher, and U. Schulz. "EB-PVD processing of pyrochlore-structured La2Zr2O7-based TBCs." Surface and Coatings Technology 182, no. 2-3 (2004): 175–83. http://dx.doi.org/10.1016/j.surfcoat.2003.08.068.

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Niu, Jingjing, Xiang Wu, Haibin Zhang, and Shan Qin. "Pressure-induced phase transition of La2Zr2O7 and La0.5Gd1.5Zr2O7 pyrochlore." RSC Advances 9, no. 33 (2019): 18954–62. http://dx.doi.org/10.1039/c9ra03438b.

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In situ high-pressure experiments on La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> and La<sub>0.5</sub>Gd<sub>1.5</sub>Zr<sub>2</sub>O<sub>7</sub> have been carried out at up to approximately 40 GPa using synchrotron X-ray diffraction and Raman spectroscopy combined with a diamond anvil cell technique.

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Srivastava, A. M., and W. W. Beers. "On the impurity trapped exciton luminescence in La2Zr2O7:Bi3+." Journal of Luminescence 81, no. 4 (1999): 293–300. http://dx.doi.org/10.1016/s0022-2313(99)00004-6.

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Guo, Xingye, Zhe Lu, Hye-Yeong Park, et al. "Thermal properties of La2Zr2O7 double-layer thermal barrier coatings." Advances in Applied Ceramics 118, no. 3 (2018): 91–97. http://dx.doi.org/10.1080/17436753.2018.1510820.

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Ma, Yuyao, Yuxia Ma, Zhibo Zhao, et al. "Fibrous La2Zr2O7 pyrochlore-supported Ni nanocatalysts for methane reforming." Journal of Physics and Chemistry of Solids 147 (December 2020): 109643. http://dx.doi.org/10.1016/j.jpcs.2020.109643.

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KIDO, H., S. KOMARNENI, and R. ROY. "ChemInform Abstract: Preparation of La2Zr2O7 by Sol-Gel Route." ChemInform 22, no. 16 (2010): no. http://dx.doi.org/10.1002/chin.199116004.

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Figueiredo, F. M., F. M. B. Marques, and J. R. Frade. "Electrode processes of LaCoO3+La2Zr2O7 cathodes deposited onto GCO." Ionics 6, no. 3-4 (2000): 260–66. http://dx.doi.org/10.1007/bf02374075.

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