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Journal articles on the topic 'Lanthanum silicate'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Mihara, Shunya, Kiyoshi Kobayashi, Takaya Akashi, and Yoshio Sakka. "Chemical Reactivity and Cathode Properties of LaCoO₃ on Lanthanum Silicate Oxyapatite Electrolyte." Key Engineering Materials 616 (June 2014): 120–28. http://dx.doi.org/10.4028/www.scientific.net/kem.616.120.

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Chemical reactivity and cathode properties of LaCoO3 were investigated using new oxide ion conductor, lanthanum silicate oxyapatite. The LaCoO3 is found to be good candidate for cathode of the lanthanum silicate oxyapatite solid-electrolyte since no chemical reaction occurred between the LaCoO3 and lanthanum silicate oxyapatite heating at 1273 K for 60 h in air. Based on electrochemical measurements, lower overpotential between the LaCoO3 and lanthanum silicate oxyapatite was confirmed compared to the overpotential at YSZ/LaCoO3 interface. From analysis on the extended interfacial conductivity as function of oxygen activity at the triple phase boundary at fixed temperature, the overpotential evaluated by impedance spectra is the rate limiting process by oxygen diffusion on the LaCoO3 surface. Comparing to the bulk conductivity of LaCoO3, the electrode resistance evaluated by impedance spectra was confirmed to be different from the electrical transport properties of the LaCoO3 bulk.

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2

Misso, Agatha Matos, Daniel Ricco Elias, Fernando dos Santos, and Chieko Yamagata. "Low Temperature Synthesis of Lanthanum Silicate Apatite Type by Modified Sol Gel Process." Advanced Materials Research 975 (July 2014): 143–48. http://dx.doi.org/10.4028/www.scientific.net/amr.975.143.

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Rare earth silicate apatite type is a very important and promising material for application as an electrolyte in IT-SOFC (Intermediate Temperature Solid Oxide Fuel Cell). Lanthanum silicate apatite, La9,33Si6O26, exhibits high conductivity and has high efficiency, long term stability, fuel flexibility, low emissions and relatively low cost compared to yttria stabilized zirconia (YSZ - yttria stabilized zirconia), at temperatures between 600 to 800 °C. One of the problems of YSZ is its high operating temperature which results in long starting times and problems of mechanical and chemical compatibility. The interest of investigating lanthanum silicate apatite as an electrolyte is to overcome the problems caused by high temperature operation required by YSZ electrolyte. In the present study, sol-gel method was used to synthesize La9,33Si6O26. Initially, the reagents (sodium silicate and lanthanum nitrate) were mixed to obtain colloidal silica. Then, this gel containing lanthanum nitrate was thermally treated to allow the melting of lanthanum nitrate salt distributed on colloidal silica. The aim of this study was to verify if this method permits the formation of La9,33Si6O26 pure apatite phase, in order to obtain fine powders and uniform particles for further processing and obtaining a ceramic body.

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3

Li, Wen Zhao, Zhi Liang Huang, Qian Zi Li, and Juan Chen. "Synthesis and Conductivity Investigation of Cu Doped Apatite Type Lanthanum Silicate Electrolyte." Key Engineering Materials 726 (January 2017): 245–49. http://dx.doi.org/10.4028/www.scientific.net/kem.726.245.

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In this paper, Cu-doped lanthanum silicate electrolyte (La9.33Si6-xCuxO26-x) precursor was synthesized by urea-nitrate combustion method using La2O3, CuO and TEOS as raw materials. The as-prepared precursor was lighted at 600 °C and sintered at 800 °C. The sintered powder samples were grinded and mixed absolutely by ball milled. Finally, we preformed and sintered powder samples to synthesis Cu-doped lanthanum silicate ceramics. Ac impedance method and analysis was used to test conductivity of as-prepared electrolyte, investigated the influence of balling time, sintering temperature and doping content on conductivity property of LSO sintered product. The final result shows that best balling time is 3 h, secondary sintering temperature is 1500 °C and the doping content is 0.3. Under this condition, the conductivity of Cu-doped lanthanum silicate electrolyte could reach 7.28×10-3 s/cm at 700 °C.

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4

Yang, Xiang Yu, Bong Mook Lee, and Veena Misra. "High Mobility 4H-SiC MOSFETs Using Lanthanum Silicate Interface Engineering and ALD Deposited SiO₂." Materials Science Forum 778-780 (February 2014): 557–61. http://dx.doi.org/10.4028/www.scientific.net/msf.778-780.557.

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In this work, we have developed a novel gate stack to enhance the mobility of Si face (0001) 4H-SiC lateral MOSFETs while maintaining a high threshold voltage. The gate dielectric consists a thin lanthanum silicate layer at SiC/dielectric interface and SiO2deposited by atomic layer deposition. MOSFETs using this interface engineering technique show a peak field effect mobility of 133.5 cm2/Vs while maintaining a positive threshold voltage of above 3V. The interface state density measured on MOS capacitor with lanthanum silicate interfacial layers is reduced compared to the capacitors without the silicate. It is shown that the presence of the lanthanum at the interface reduces the formation of a lower quality SiOxinterfacial layer typically formed at the SiC surface during typical high temperature anneals. This better quality interfacial layer produces a sharp SiC/dielectric interface, which is confirmed by cross section Z-contrast STEM images.

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5

Noviyanti, Atiek Rostika, Nur Akbar, Iwan Hastiawan, Iman Rahayu, Haryono, Yoga Trianzar Malik, and Risdiana. "Bi Doping Effect on the Conductivity of Lanthanum Silicate Apatite." Materials Science Forum 966 (August 2019): 451–55. http://dx.doi.org/10.4028/www.scientific.net/msf.966.451.

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Lanthanum silicate apatite with various concentration of Bi-doped of La10-xBixSi6O27 were successfully synthesized by hydrothermal method in order to study effect of Bi-doped tp its structure and conductivity properties. It is found that main peaks of lanthanum silicate apatite were observed with amount of impurities. The value of conductivity at 500°C determining from AC impedance measurement was in the range between 1.99 × 10-6 S/cm and 2.03 × 10-6 S/cm. The highest conductivity was observed in the sample with x = 0.5, 1.0 and 1.5.

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6

Bois, Laurence, M. J. Guittet, N. Barré, P. Trocellier, S. Guillopé, M. Gautier, P. Verdier, and Y. Laurent. "Aqueous alteration of lanthanum alumino-silicate glasses." Journal of Non-Crystalline Solids 276, no. 1-3 (October 2000): 181–94. http://dx.doi.org/10.1016/s0022-3093(00)00275-1.

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7

Deudon, C., A. Meerschaut, and J. Rouxel. "Structure Determination of Lanthanum Seleno-Silicate, La4Se3Si2O7." Journal of Solid State Chemistry 104, no. 2 (June 1993): 282–88. http://dx.doi.org/10.1006/jssc.1993.1162.

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8

Shi, Qing Le, Hua Zhang, Tian Jing Li, Fang Li Yu, Hai Jun Hou, and Peng De Han. "Sintering Properties of Apatite-Type Lanthanum Silicate Electrolytes." Materials Science Forum 814 (March 2015): 65–70. http://dx.doi.org/10.4028/www.scientific.net/msf.814.65.

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The sintering properties of appetite-type lanthanum silicate La10Si6O27prepared by sol-gel process were studied. The precursor powder was sintered by one-step sintering (OSS) process, two-step sintering (TSS) process and spark-plasma sintering (SPS) process. The phase structure, microstructure, relative density, thermal expansion properties, electrochemical properties of the samples were investigated by means of the techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), Archimedes method, dilatometer, and AC impedance spectroscopy. The experimental results show that the samples sintered by SPS process can decrease the sintering temperature, shorten the sintering time, increase the density, and reduce the particle size. The appetite-type lanthanum silicate La10Si6O27 sintered by SPS process shows better sintering properties than of sintered by OSS process and TSS process, which can beneficial to the thermal expansion properties and conductivity.

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9

Pandis, P. K., E. Xenogiannopoulou, P. M. Sakkas, G. Sourkouni, Ch Argirusis, and V. N. Stathopoulos. "Compositional effect of Cr contamination susceptibility of La9.83Si6−x−yAlxFeyO26±δ apatite-type SOFC electrolytes in contact with CROFER 22 APU." RSC Advances 6, no. 55 (2016): 49429–35. http://dx.doi.org/10.1039/c6ra02025a.

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10

Hori, Shigeo, Yasuhiro Takatani, Hiroaki Kadoura, Takeshi Uyama, Satoru Fujita, and Toshihiko Tani. "Chemical solution deposition of the highly c-axis oriented apatite type lanthanum silicate thin films." Dalton Transactions 44, no. 40 (2015): 17551–56. http://dx.doi.org/10.1039/c5dt02569a.

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11

Ishiyama, T., H. Maruyama, H. Kishimoto, K. D. Bagarinao, T. Horita, K. Yamaji, and A. Yamazaki. "Degradation of Electrical Conductivity in Lanthanum Silicate Oxyapatite." ECS Transactions 68, no. 1 (July 17, 2015): 523–27. http://dx.doi.org/10.1149/06801.0523ecst.

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12

van Vliet, J. P. M., and G. Blasse. "Luminescence from Pr3+ in barium lanthanum silicate oxyapatite." Materials Research Bulletin 25, no. 3 (March 1990): 391–94. http://dx.doi.org/10.1016/0025-5408(90)90112-f.

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13

Fleet, Michael E., and Xiaoyang Liu. "High-pressure rare earth silicates: Lanthanum silicate with barium phosphate structure, holmium silicate apatite, and lutetium disilicate type X." Journal of Solid State Chemistry 178, no. 11 (November 2005): 3275–83. http://dx.doi.org/10.1016/j.jssc.2005.08.007.

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14

Fukuda, Koichiro, Toru Asaka, and Tomohiro Uchida. "Thermal expansion of lanthanum silicate oxyapatite (La9.33+2x(SiO4)6O2+3x), lanthanum oxyorthosilicate (La2SiO5) and lanthanum sorosilicate (La2Si2O7)." Journal of Solid State Chemistry 194 (October 2012): 157–61. http://dx.doi.org/10.1016/j.jssc.2012.04.043.

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15

Shin, Dong-Kyu, Yong Kim, Hyun-Ho Seo, Pyung-An Ahn, Eui-Chol Shin, John G. Fisher, Dong-Ik Kim, Jong-Ho Lee, and Jong-Sook Lee. "Effect of Crystallographic Anisotrophy and Lanthanum Stoichiometry on Microstructural Evolution of Lanthanum Silicate Electrolytes." Journal of the American Ceramic Society 95, no. 8 (May 23, 2012): 2439–50. http://dx.doi.org/10.1111/j.1551-2916.2012.05241.x.

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16

FUKUDA, Koichiro, Fuminori MAEKAWA, Takuya EGUCHI, Yuki TSUNODA, Daisuke URUSHIHARA, Toru ASAKA, and Hideto YOSHIDA. "Templated grain growth of textured lanthanum silicate oxyapatite ceramics." Journal of the Ceramic Society of Japan 128, no. 11 (November 1, 2020): 954–61. http://dx.doi.org/10.2109/jcersj2.20171.

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17

Gaddam, Anuraag, Hugo R. Fernandes, Dilshat U. Tulyaganov, and José M. F. Ferreira. "The structural role of lanthanum oxide in silicate glasses." Journal of Non-Crystalline Solids 505 (February 2019): 18–27. http://dx.doi.org/10.1016/j.jnoncrysol.2018.10.023.

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18

Jothinathan, Ezhil, Kim Vanmeensel, Jef Vleugels, Tamara Kharlamova, Vladislav Sadykov, Svetlana Pavlova, Georgia Sourkouni, Christian Szepanski, Christos Argirusis, and Omer Van der Biest. "Apatite type lanthanum silicate and composite anode half cells." Solid State Ionics 192, no. 1 (June 2011): 419–23. http://dx.doi.org/10.1016/j.ssi.2010.02.009.

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19

Mieda, H., A. Mineshige, T. Nishimoto, M. Tange, Y. Daiko, T. Yazawa, H. Yoshioka, and R. Mori. "Solid Oxide Fuel Cells Using Lanthanum Silicate Electrolyte Films." ECS Transactions 57, no. 1 (October 6, 2013): 1135–41. http://dx.doi.org/10.1149/05701.1135ecst.

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20

Litzkendorf, Doris, Anne Matthes, Anka Schwuchow, Jan Dellith, Katrin Wondraczek, and Heike Ebendorff-Heidepriem. "Extruded suspended core fibers from lanthanum-aluminum-silicate glass." Optical Materials Express 11, no. 1 (December 16, 2020): 142. http://dx.doi.org/10.1364/ome.409422.

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21

Noviyanti, Atiek Rostika, Yati B. Yuliyati, Solihudin, Iman Rahayu, Dani Gustaman Syarif, and Risdiana. "Conductivity of Lanthanum Silicate Apatite Derived from Rice Husk." Key Engineering Materials 860 (August 2020): 122–27. http://dx.doi.org/10.4028/www.scientific.net/kem.860.122.

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Effect of difference silica source, namely commersial silica and silica from rice husk, as Si precursor on the synthesis of lanthanum silicate apatite (LSO) have been investigated. The conductivity of LSO was determined by impedance spectroscopy using LCR meter. The conductivity of LSO based on rice husk extraction (s700°C = 2.13 ´ 10-4 S.cm-1) was ten times lower than that of LSO with commercial silica (s700°C = 3.11´ 10-5 S.cm-1). Carbon content as an impurity on silica from rice husk extraction is suspected to decrease the homogeneity of its morphology so that it has an impact on its conductivity.

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22

Suarez, Gustavo, Ngan T. K. Nguyen, Nicolas M. Rendtorff, Yoshio Sakka, and Tetsuo Uchikoshi. "Electrophoretic deposition for obtaining dense lanthanum silicate oxyapatite (LSO)." Ceramics International 42, no. 16 (December 2016): 19283–88. http://dx.doi.org/10.1016/j.ceramint.2016.09.095.

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23

Husain, S. Waqif, M. Ghannadi Marageh, and M. Anbia. "Radionuclides sorption on lanthanum silicate: a new ion exchanger." Applied Radiation and Isotopes 44, no. 4 (April 1993): 745–49. http://dx.doi.org/10.1016/0969-8043(93)90142-w.

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24

Cao, Xiao Guo, and San Ping Jiang. "Synthesis and characterization of lanthanum silicate oxyapatites co-doped with A (A = Ba, Sr, and Ca) and Fe for solid oxide fuel cells." J. Mater. Chem. A 2, no. 48 (2014): 20739–47. http://dx.doi.org/10.1039/c4ta04616a.

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The co-doped lanthanum silicate oxyapatites, La_9.5A_0.5Si_5.5Fe_0.5O_26.5 (A = Ba, Sr, and Ca), are synthesized by the high-temperature solid state reaction process.

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25

Noviyanti, Atiek Rostika, Dani Gustaman Syarif, Riansyah Amynurdin, Iwan Hastiawan, Iman Rahayu, and Yati B. Yuliyati. "Konduktivitas Apatit Lantanum Silikat La9.33Si6O26 Hasil Sintesis Hidrotermal dengan Mineraliser NaOH dan KOH." ALCHEMY Jurnal Penelitian Kimia 14, no. 1 (February 15, 2018): 1. http://dx.doi.org/10.20961/alchemy.14.1.8468.1-15.

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<p>Apatit lantanum silikat banyak digunakan sebagai elektrolit pada sel bahan bakar padatan (SOFC). Beberapa oksida apatit lantanum silikat La<sub>9.33</sub>Si<sub>6</sub>O<sub>26 </sub>telah disintesis dengan metode hidrotermal guna mengamati pentingnya peranan mineraliser terhadap karakternya. Penelitian ini bertujuan untuk mengetahui pengaruh jenis dan konsentrasi mineraliser terhadap kristalinitas, ukuran partikel dan hubungannya dengan sifat konduktivitas oksida apatit lantanum silikat. Struktur, ukuran partikel dan konduktivitas oksida apatit masing-masing dikarakterisasi dengan XRD, PSA dan spektroskopi impedansi. Oksida apatit lantanum silikat diperoleh dengan melarutkan La<sub>2</sub>O<sub>3</sub> dan Na<sub>2</sub>SiO<sub>3</sub> dengan mol ratio 1,555 menggunakan mineraliser NaOH (3-5 M) dan KOH (0,3-0,7 M). Hasil penelitian menunjukkan bahwa kinerja elektrolit sangat ditentukan oleh kristalinitas dan morfologi apatit lanthanum silikat yang dipengaruhi oleh jenis dan konsentrasi mineralizer. Ukuran apatit lantanum silikat terkecil diperoleh dari hasil sintesis dengan menggunakan mineraliser NaOH 3 M yaitu 1,7889 µm, dengan nilai konduktivitas tertinggi yaitu 1,99×10<sup>-6 </sup>S/cm pada suhu operasi 600 ºC. Berdasarkan hasil tersebut NaOH 3 M merupakan mineraliser yang paling baik untuk menghasilkan apatit lanthanum silikat La<sub>9.33</sub>Si<sub>6</sub>O<sub>26</sub>.</p><p><strong>Conductivity of </strong><strong>L</strong><strong>anthanum </strong><strong>S</strong><strong>ilicate </strong><strong>A</strong><strong>patite </strong><strong>P</strong><strong>hase of La<sub>9.33</sub>Si<sub>6</sub>O<sub>26</sub> </strong><strong>P</strong><strong>repare</strong><strong>d</strong><strong> by </strong><strong>H</strong><strong>ydrothermal </strong><strong>S</strong><strong>ynthesis using NaOH and KOH as </strong><strong>M</strong><strong>ineralizer</strong><strong>. </strong>Lanthanum silicates are used as electrolytes in solid oxide fuel cells (SOFC). Some oxide-based apatite has been synthesized by hydrothermal method to observe mineralizer effect on the process of crystallization. The effect of type and amount of mineralizers for preparing apatite –type lanthanum silicate of La<sub>9.33</sub>Si<sub>6</sub>O<sub>26 </sub>was investigatedon its crystallinity, particle size, as well as on the conductivity properties relationship were investigated. The structure, particle size and conductivity of La<sub>9.33</sub>Si<sub>6</sub>O<sub>26</sub> was characterized using X-ray diffraction, particle size analyzer and impedance spectroscopy respectively. The results show that the electrolyte performance is strongly dependent on the crystallinity and the morphology textural of lanthanum silicate apatite affected by the type and amount of mineralizer. The lanthanum silicate apatiteprepared by La<sub>2</sub>O<sub>3</sub> and Na<sub>2</sub>SiO<sub>3</sub> (molar ratio of La<sub>2</sub>O<sub>3</sub> and Na<sub>2</sub>SiO<sub>3</sub> = 1.555), and NaOH (3; 4; 5 M) and KOH (0,3-0,7 M) as mineralizer. As a result, apatite-type lanthanum silicate was prepare using NaOH 3 M shows smallest particle (1.7889 μm) and highest conductivity (1.99 × 10-6 S / cm at 600 ºC). With respect to both particle size and conductivity, the NaOH 3 M can be selected as a suitable type and amount mineralizer for the preparation of excellent lanthanum silicate apatite La<sub>9.33</sub>Si<sub>6</sub>O<sub>26</sub>. </p>

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26

Kang, Min Seok, Kevin Lawless, Bong Mook Lee, and Veena Misra. "Effect of High Temperature Forming Gas Annealing on Electrical Properties of 4H-SiC Lateral MOSFETs with Lanthanum Silicate and ALD SiO₂ Gate Dielectric." Materials Science Forum 924 (June 2018): 482–85. http://dx.doi.org/10.4028/www.scientific.net/msf.924.482.

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We investigated the impact of an initial lanthanum oxide (La2O3) thickness and forming gas annealing (FGA) conditions on the MOSFET performance. The FGA has been shown to dramatically improve the threshold voltage (VT) stability of 4H-SiC MOSFETs. The FGA process leads to low VTshift and high field effect mobility due to reduction of the interface states density as well as traps by passivating the dangling bonds and active traps in the Lanthanum Silicate dielectrics. By optimizing the La2O3interfacial layer thickness and FGA condition, SiC MOSFETs with high threshold voltage and high mobility while maintaining minimal VTshift are realized.

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27

Aspinall, H. C., P. A. Williams, J. Gaskell, A. C. Jones, J. L. Roberts, L. M. Smith, P. R. Chalker, and G. W. Critchlow. "Growth of Lanthanum Silicate Thin Films by Liquid Injection MOCVD Using Tris[bis(trimethylsilyl)amido]lanthanum." Chemical Vapor Deposition 9, no. 1 (January 3, 2003): 7–10. http://dx.doi.org/10.1002/cvde.200290009.

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28

Fukuda, Koichiro, Toru Asaka, Masahiro Okino, Abid Berghout, Emilie Béchade, Olivier Masson, Isabelle Julien, and Philippe Thomas. "Anisotropy of oxide-ion conduction in apatite-type lanthanum silicate." Solid State Ionics 217 (June 2012): 40–45. http://dx.doi.org/10.1016/j.ssi.2012.04.018.

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29

Georges, Samuel, François Goutenoire, and Philippe Lacorre. "Crystal structure of lanthanum bismuth silicate Bi2−xLaxSiO5 (x∼0.1)." Journal of Solid State Chemistry 179, no. 12 (December 2006): 4020–28. http://dx.doi.org/10.1016/j.jssc.2006.09.011.

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30

Yang, Xiangyu, Bongmook Lee, and Veena Misra. "Investigation of Lanthanum Silicate Conditions on 4H-SiC MOSFET Characteristics." IEEE Transactions on Electron Devices 62, no. 11 (November 2015): 3781–85. http://dx.doi.org/10.1109/ted.2015.2480047.

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31

Jur, J. S., D. J. Lichtenwalner, and A. I. Kingon. "High temperature stability of lanthanum silicate dielectric on Si (001)." Applied Physics Letters 90, no. 10 (March 5, 2007): 102908. http://dx.doi.org/10.1063/1.2712805.

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32

Hwan Jo, Seung, P. Muralidharan, and Do Kyung Kim. "Low-temperature sintering of dense lanthanum silicate electrolytes with apatite-type structure using an organic precipitant synthesized nanopowder." Journal of Materials Research 24, no. 1 (January 2009): 237–44. http://dx.doi.org/10.1557/jmr.2009.0018.

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Highly sinterable La10Si6O27 and La10Si5.5M0.5O27 (M = Mg, and Al) nanopowders with apatite-type structure have been synthesized via a homogeneous precipitation method using diethylamine (DEA) as a precipitant. The synthetic approach using an organic precipitant with dispersant characteristics is advantageous in configuring weakly agglomerated nanopowders, leading to desirable sintering activity. X-ray diffraction powder patterns confirmed the single-phase crystalline lanthanum silicate of hexagonal apatite structure at 800 °C, which is a relatively lower calcination temperature compared to conventionally prepared samples. Transmission electron microscopy images revealed particles ∼30 nm in size with a high degree of crystallinity. A dense grain morphology was recognized from the scanning electron microscopy images of the polished surface of the pellets that were sintered at 1400 and 1500 °C for 10 h. This low-temperature sintering is significant because conventional powder processing requires a temperature above 1700 °C to obtain the same dense electrolyte. The doped-lanthanum silicate electrolyte prepared by the DEA process and sintered at 1500 °C for 10 h exhibited electrical conductivity comparable with samples prepared at much higher sintering temperature (>1700 °C).

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33

Wu, Ran, Jia Mei Ye, Qi Zhao Li, Sheng Yun Wang, Xiu Lei Chen, Jian Ming Yang, Gang Tan, Jun Liang Liu, and Ming Zhang. "Synthesis of (Ba,Ti)-Doped Apatite-Type Lanthanum Silicate Nano-Sized Powders via Microwave-Assisted Sol-Gel Auto-Combustion Route." Advanced Materials Research 652-654 (January 2013): 882–85. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.882.

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In this paper, (Ba,Ti)-doped lanthanum silicate nano-sized powders have been synthesized via microwave assisted sol-gel auto-combustion route by using TEOS and lanthanum nitrate as the starting materials, citric acid and glycol as chelators. Both the phase compositions and morphologies of the obtained powders have been characterized. The results indicated that: the synthesized nano powders were characterized as fluffy aggregates with the particle size ranging from 50 to 100nm. As the doping contents of Ba increased, the crystalline sizes decreased and the aggregation were deteriorated, while the particle size decreased from 120nm to 80nm and the aggregation between particles were halted as the doping contents of Ti increased.

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34

Takahashi, Junichi, Hidetoshi Honda, Takaya Akashi, Kazutomo Abe, Hidenobu Itoh, and Masami Kishi. "Low-Temperature Sintering of Apatite-Type Lanthanum Silicate with Fluoride Additives." Advances in Science and Technology 62 (October 2010): 235–40. http://dx.doi.org/10.4028/www.scientific.net/ast.62.235.

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Various fluorides (3 - 8 wt%) were added to a La9.33Si6O26 (LSO) powder synthesized by calcining the corresponding oxides mixture at 1100°C for 4 h. The addition of BaF2, AlF3 or Ba3Al2F12 caused an appreciable and substantial increase in bulk density after sintering at 1400º and 1450°C, respectively. These fluorides melt below 1400°C to form liquid phase which could assist the densification at low temperatures. Abnormal grain growth was observed for LSO samples with the addition of AlF3 and Ba3Al2F12, but it was effectively suppressed by stepwise sintering at 1400º and 1450°C. The BaF2 addition brought about the simultaneous promotion of densification and moderate grain growth, leading to the production of a densified LSO sample showing a conductivity of 1.5 x 10–2 Scm–1 at 800°C with an activation energy of 1.23 eV.

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35

Mineshige, Atsushi, Hiroyuki Mieda, Mitsuaki Manabe, Takahiro Funahashi, Yusuke Daiko, Tetsuo Yazawa, Mina Nishi, et al. "Oxide ion and electron transport properties in lanthanum silicate oxyapatite ceramics." Solid State Ionics 262 (September 2014): 555–58. http://dx.doi.org/10.1016/j.ssi.2014.04.009.

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36

Dai, Lei, Guixia Yang, Huizhu Zhou, Zhangxing He, Yuehua Li, and Ling Wang. "Mixed potential NH3 sensor based on Mg-doped lanthanum silicate oxyapatite." Sensors and Actuators B: Chemical 224 (March 2016): 356–63. http://dx.doi.org/10.1016/j.snb.2015.10.071.

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37

Mineshige, Atsushi, Atsushi Saito, Mio Kobayashi, Hikaru Hayakawa, Mizuki Momai, Tetsuo Yazawa, Hideki Yoshioka, et al. "Lanthanum silicate-based layered electrolyte for intermediate-temperature fuel cell application." Journal of Power Sources 475 (November 2020): 228543. http://dx.doi.org/10.1016/j.jpowsour.2020.228543.

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38

Lichtenwalner, Daniel J., Jesse Jur, Naoya Inoue, and Angus Kingon. "High-Temperature Processing Effects on Lanthanum Silicate Gate Dielectric MIS Devices." ECS Transactions 1, no. 5 (December 21, 2019): 227–38. http://dx.doi.org/10.1149/1.2209272.

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39

Guénard, Romain, Katarzyna Krupa, Alessandro Tonello, Marc Fabert, Jean-Louis Auguste, Georges Humbert, Stéphanie Leparmentier, et al. "Spatial beam self-cleaning in multimode lanthanum aluminum silicate glass fiber." Optical Fiber Technology 53 (December 2019): 102014. http://dx.doi.org/10.1016/j.yofte.2019.102014.

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40

Matsunaga, Katsuyuki, and Kazuaki Toyoura. "First-principles analysis of oxide-ion conduction mechanism in lanthanum silicate." Journal of Materials Chemistry 22, no. 15 (2012): 7265. http://dx.doi.org/10.1039/c2jm16283k.

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41

Kovalevsky, A. V., F. M. B. Marques, V. V. Kharton, F. Maxim, and J. R. Frade. "Silica-scavenging effect in zirconia electrolytes: assessment of lanthanum silicate formation." Ionics 12, no. 3 (June 8, 2006): 179–84. http://dx.doi.org/10.1007/s11581-006-0031-5.

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42

Pons, Aénor, Emilie Béchade, Jenny Jouin, Maggy Colas, Pierre-Marie Geffroy, Olivier Masson, Philippe Thomas, et al. "Structural modifications of lanthanum silicate oxyapatite exposed to high water pressure." Journal of the European Ceramic Society 37, no. 5 (May 2017): 2149–58. http://dx.doi.org/10.1016/j.jeurceramsoc.2016.12.034.

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43

Kobayashi, Kiyoshi, Yoshitaka Matsushita, Masahiko Tanaka, Yoshio Katsuya, Chikashi Nishimura, and Yoshio Sakka. "Electrical conductivity and X-ray diffraction analysis of oxyapatite-type lanthanum silicate and neodymium silicate solid solution." Solid State Ionics 225 (October 2012): 443–47. http://dx.doi.org/10.1016/j.ssi.2012.02.008.

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44

Yuan, Lin, Song Lin Chen, Xue Feng Chen, Xi Jun Liu, Jie Zeng Wang, and Xue Tao Yuan. "Spinel and Lanthanum Zirconate Composite for Cement Kiln." Applied Mechanics and Materials 66-68 (July 2011): 1179–86. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.1179.

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Abstract:

Researching and developing chrome-free refractory becomes a research hotspot at present because hexavalent chromium ions (Cr6+) may lead to environmental hazard. The additives lanthanum oxide (La2O3), effect on mechanism of spinel refractory react with cement clinker, several additives, such as cerium oxide (Ce2O3), titanium dioxide (TiO2), barium oxide (BaO), iron oxide (Fe2O3), are researched in this paper. It indicates that La2O3 is a suitable additive to MgO-MgAl2O4-ZrO2 brick which not only could stabilize phase transition of dicalcium silicate (C2S) in cement, but also do not impair the high-temperature-properties of spinel. The new environmentally friendly material spinel and lanthanum zirconate Composite is an excellent refractory for cement kiln which has high thermal shock resistance, good coating adherence, good corrosion resistance, higher mechanical strength, and longer service life than magnesia-chrome brick when they are used for sintering zone in cement kiln.

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Toja, Ramiro, Nicolás Rendtorffa, Esteban Agliettia, Tetsuo Uchikoshi, Yoshio Sakka, and Gustavo Suáreza. "Dense lanthanum silicate oxyapatite ceramics obtained by uniaxial pressing and slip casting." Science of Sintering 50, no. 4 (2018): 433–43. http://dx.doi.org/10.2298/sos1804433t.

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Abstract:

Lanthanum silicate oxyapatite (LSO) is a promising ion conductive ceramic material, which has higher oxygen ion conductivity at intermediate temperatures (600-800?C) compared to yttria-stabilized zirconia. Its mechanical properties, though important for any of its applications, have been scarcely reported. In this study, we compare apparent densification, open porosity and Vickers hardness of samples conformed by uniaxial pressing and slip casting and fired up to 1600?C. Colloidal processing was optimized for slip casting in order to get high green densities. At sintering temperatures higher than 1400?C, both processing routes yielded comparable densities, although uniaxially pressed samples show slightly better mechanical properties, evidencing that slip cast ones already underwent a grain growth process.

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Sangeetha, Neralagatta M., and Frank C. J. M. van Veggel. "Lanthanum Silicate and Lanthanum Zirconate Nanoparticles Co-Doped with Ho3+ and Yb3+: Matrix-Dependent Red and Green Upconversion Emissions." Journal of Physical Chemistry C 113, no. 33 (July 15, 2009): 14702–7. http://dx.doi.org/10.1021/jp904516s.

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Kobayashi, Kiyoshi, and Yoshio Sakka. "Sinterable Powder Fabrication and the Oxygen-ion Conductivity of Lanthanum Silicate Oxyapatite." Journal of the Society of Powder Technology, Japan 52, no. 11 (2015): 648–57. http://dx.doi.org/10.4164/sptj.52.648.

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FUKUDA, Koichiro, Yuki TSUNODA, Daisuke URUSHIHARA, Toru ASAKA, and Hideto YOSHIDA. "Flux growth of doped lanthanum silicate oxyapatite crystals with hexagonal tabular morphology." Journal of the Ceramic Society of Japan 127, no. 3 (March 1, 2019): 143–49. http://dx.doi.org/10.2109/jcersj2.18174.

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Kobayashi, Kiyoshi, Tohru S. Suzuki, Tetsuo Uchikoshi, and Yoshio Sakka. "Magnesium ion distribution and defect concentrations of MgO-doped lanthanum silicate oxyapatite." Solid State Ionics 258 (May 2014): 24–29. http://dx.doi.org/10.1016/j.ssi.2014.01.015.

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Mineshige, Atsushi, Hikaru Hayakawa, Takuma Nishimoto, Akie Heguri, Tetsuo Yazawa, Yuki Takayama, Yasushi Kagoshima, Hidekazu Takano, Shingo Takeda, and Junji Matsui. "Preparation of lanthanum silicate electrolyte with high conductivity and high chemical stability." Solid State Ionics 319 (June 2018): 223–27. http://dx.doi.org/10.1016/j.ssi.2018.02.002.

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