Copper-Conducting Nasicon-Type CuTi2(PO4)3 Glass-Ceramics for Application to a Novel O2 Sensor

1998 ◽  
Vol 548 ◽  
Author(s):  
K. Yamamoto ◽  
T. Kasuga ◽  
M. NOGAMI
Keyword(s):  
Electrical Conductivity ◽  
Low Temperature ◽  
Glass Ceramic ◽  
Redox Reaction ◽  
Electromotive Force ◽  
Glass Ceramics ◽  
Concentration Cell ◽  
Nasicon Type ◽  
Controlled Crystallization ◽  
Crystallization Of Glass

ABSTRACTFast Cu+-conducting ceramics containing NASICON-type CuTi2(PO4)3 and Cu3 (PO4)2 phases, which three-dimensionally interlock with each other, has been successfully prepared by the controlled crystallization of glass in the Cu-Ti-P-O system. The electrical conductivity of the glass-ceramic was ∼3×10−4Scm−1 at 300°C. The obtained glass-ceramics was applied to an oxygen-concentration cell operating at low temperature such as 100°C. The electromotive force (EMF) of the sensor showed good Nemstian response. The mechanism for O2 sensing is discussed in terms of the redox reaction between Cu+ ion in the dense glass-ceramic and O2 gas.

Influence of B2O3 on Dielectric, Mechanical, and Thermal Properties of MgO-Al2O3-SiO2 Glass-Ceramics

2019 ◽  
Vol 821 ◽  
pp. 435-439
Author(s):  
Bo Li ◽  
Ke Jing ◽  
Hai Bo Bian
Keyword(s):  
Activation Energy ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Low Temperature ◽  
Flexural Strength ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
Mechanical And Thermal Properties ◽  
Sintering Process ◽  
Low Thermal Expansion

Low temperature sintered MgO-Al2O3-SiO2 glass-ceramic with high mechanical and low thermal expansion was prepared for package. The remarkable influence of B2O3 addition on the electrical, mechanical, and thermal properties was fully investigated. A small amount of B2O3 promoted the sintering process and improved the densification of MAS. The kinetics via Kissinger method indicated that an appropriate B2O3 content decreased the activation energy and helped the occurrence of crystallization. Due to the increase of crystallinity and indialite phase, B2O3 addition significantly enhanced flexural strength and Young’s modulus. MAS doped with 3wt% B2O3 can be sintered at 900 °C and obtained good properties: σ = 229 MPa, φ = 86 GPa, α = 1.66×10-6 /°C, εr = 5.29, and tanδ = 5.9×10-4.

Zn2+- Controlled Crystallization and Microstructure in K-Li-Mg-B-Si-Al-F Glass

MRS Advances ◽  
2018 ◽  
Vol 3 (60) ◽  
pp. 3525-3533 ◽  
Author(s):  
Mrinmoy Garai ◽  
Anoop K. Maurya ◽  
Shibayan Roy
Keyword(s):  
Heat Treatment ◽  
Thermal Expansion ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Ceramic ◽  
Vickers Microhardness ◽  
Glass Ceramics ◽  
Network Modifier ◽  
Base Glass ◽  
Controlled Crystallization

Abstract Text:The crystallization of (9-X) K2O-1Li2O-12MgO-10B2O3-40SiO2-16Al2O3-12MgF2-X PbO/BaO/ZnO (X =0/5) composition (wt.%) were studied by means of dilatometry, DSC, XRD, SEM and microhardness analysis. Density of base K-Li-Mg-B-Si-Al-F glass (2.59 g.cm–3) is found to be increased on addition of the network modifier oxides PbO, BaO and ZnO content. Addition of Pb2+, Ba2+ and Zn2+ furthermore increased the glass transition temperature (Tg.). A characteristic exothermic hump is found to be appeared in DSC thermograph at the temperature range 800-950°C; and that is ascribed to the formation of crystalline phase fluorophlogopite mica, KMg3(AlSi3O10)F2. Opaque glass-ceramics were prepared from K-Li-Mg-B-Si-Al-F glasses (with and without containing PbO, BaO and ZnO content) by controlled heat-treatment at 1000°C. Interlocked type microstructure combined of flake like fluorophlogopite mica crystals is obtained in ZnO-containing K-Li-Mg-B-Si-Al-F glass-ceramic; and such microstructural pattern is ascribed to cause large thermal-expansion (>11.5×10-6/K, 50-800°C).Vickers Microhardness of base glass-ceramic (5.12 GPa) is increased when contains ZnO (5.26 GPa). ZnO-containing boroaluminosilicate glass-ceramic is, hence, considered with potential interest as they can exhibit the microcrack resistivity in high temperature recycling operation (like SOFC).

Low temperature synthesis of anorthite based glass-ceramics via sintering and crystallization of glass-powder compacts

2006 ◽  
Vol 26 (13) ◽  
pp. 2503-2510 ◽  
Author(s):  
V.M.F. Marques ◽  
D.U. Tulyaganov ◽  
S. Agathopoulos ◽  
V.Kh. Gataullin ◽  
G.P. Kothiyal ◽  
...  
Keyword(s):  
Low Temperature ◽  
Glass Powder ◽  
Glass Ceramics ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Powder Compacts ◽  
Crystallization Of Glass

NMR studies of Li mobility in NASICON-type glass-ceramic ionic conductors with optimized microstructure

2019 ◽  
Vol 7 (23) ◽  
pp. 13968-13977 ◽  
Author(s):  
Anastasia Vyalikh ◽  
Marc Schikora ◽  
Kaspar P. Seipel ◽  
Max Weigler ◽  
Matthias Zschornak ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
Ionic Conductors ◽  
Nmr Studies ◽  
Nasicon Type ◽  
Li Content

Increase in grain connectivity and Li content improves ionic conductivity in Y-modified LAGP glass-ceramics.

Effects of Phosphorus and Fluorine on the Crystallization and Structure of CaO-A12O3-SiO2 System Glass-Ceramic

2008 ◽  
Vol 368-372 ◽  
pp. 1412-1414 ◽  
Author(s):  
Jin Shu Cheng ◽  
Hui Guang Qiu ◽  
Hong Li ◽  
Jun Xie
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Scanning Electron Microscopy ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Yellow Phosphorus ◽  
Crystallization Of Glass ◽  
Scanning Electron

CaO-A12O3-SiO2 (CAS) system glass-ceramics were prepared by sintering with certain amount of yellow phosphorus slag. The effects of phosphorus and fluorine on the nucleation, crystallization and structure of CAS system glass-ceramics were investigated by differential thermal analysis, X-ray diffraction, scanning electron microscopy and other measuring methods. Glass-ceramics of CAS system with 42.32wt% yellow phosphorus slag were obtained by nucleating at 615°C for 1 hour and crystallizing at 926°C for 2 hours. The results showed that the introduction of phosphorus and fluorine promoted the nucleation and crystallization of glass-ceramics, lowering the crystallizing temperature. The main crystal phase of glass-ceramics was β-wollastonite. The density of the glass-ceramic was 2.695g/cm3.

Zircontes/Sulfates Composites: Perfect Combination of High- and Low-Temperature Protonic Conductors

2010 ◽  
Vol 434-435 ◽  
pp. 719-722
Author(s):  
Zhen Zhen Peng ◽  
Rui Song Guo ◽  
Zi Guang Yin ◽  
Juan Li
Keyword(s):  
Electrical Conductivity ◽  
Fuel Cell ◽  
Low Temperature ◽  
Electromotive Force ◽  
Ionic Transport ◽  
Proton Conductors ◽  
Transport Numbers ◽  
Barium Zirconate ◽  
Emf Measurements ◽  
Protonic Conductors

Two typical classes of proton conductors, zirconates and solid acids (such as CsHSO4) or related sulfates, are intensively investigated recently. Based on the different proton-conducting mechanisms of zirconates and sulfates, we designed and fabricated Y2O3-doped barium zirconate/sulfates composites, aiming to make full use of the benefits, and eliminate the drawbacks of the two individual materials. The electrical conduction of the composite was studied by electrical and electrochemical methods. Microstructure of the composites was examined by SEM. Electromotive force (EMF) measurements were conducted under fuel cell conditions. The results indicated that small amount of sulfates was introduced at the grain boundaries of BaZr0.9Y0.1O2.95. The electrical conductivity of the composites was greatly improved and the total ionic transport numbers of the composites are more than 0.9 at 750 °C.

Effects of Heat Treatment Condition on Properties of Strontium Barium Niobate Based Glass-Ceramic for Energy Storage Capacitors

2011 ◽  
Vol 311-313 ◽  
pp. 2071-2074 ◽  
Author(s):  
Guo Hua Chen ◽  
Wen Jun Zhang
Keyword(s):  
Energy Storage ◽  
Glass Ceramic ◽  
Crystallization Temperature ◽  
Breakdown Strength ◽  
Glass Ceramics ◽  
High Energy ◽  
High Energy Density ◽  
Strontium Barium Niobate ◽  
Strontium Barium ◽  
Controlled Crystallization

Strontium barium niobate-based glass-ceramics are prepared by melt-casting followed by controlled crystallization. Results show that Ba0.25Sr0.75Nb2O6 with tungsten bronze structure forms as the dielectric phases from the glass matrix at 800°C. However, a secondary phase NaSr1.2Ba0.8Nb5O15 occurrs when crystallization temperature exceeds 850°C. The glass-ceramics formed through controlled crystallization exhibit the excellent stability of the temperature and frequency dependence of dielectric properties. The breakdown strength increases with the crystallization temperature. The glass-ceramic material heated at 800°C/3h+950°C/3h shows a breakdown strength of 1400 kV/cm and its energy storage density can reach up to 4.0 J/cm3, which may be strong candidate for high energy density storage capacitors for portable or pulsed power applications.

Electrical conductivity of Na2O–Nb2O5–P2O5 glass and fabrication of glass–ceramic composites with NASICON type Na3Zr2Si2PO12

2015 ◽  
Vol 269 ◽  
pp. 19-23 ◽  
Author(s):  
Tsuyoshi Honma ◽  
Masayoshi Okamoto ◽  
Takuya Togashi ◽  
Noriko Ito ◽  
Kenji Shinozaki ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Glass Ceramic ◽  
Ceramic Composites ◽  
Nasicon Type
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