scholarly journals Sodium-Ion Conductivity and Humidity-Sensing Properties of Na2O-MoO3-P2O5 Glass-Ceramics

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 240
Author(s):  
Mallaurie Foucaud ◽  
Sanja Renka ◽  
Teodoro Klaser ◽  
Jasminka Popović ◽  
Željko Skoko ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Proton Conductivity ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
Sodium Ion ◽  
Sodium Ions ◽  
Humid Atmosphere ◽  
Humidity Sensing ◽  
Prepared Glass ◽  
Humidity Sensing Properties

A series of glass-ceramics were prepared by heat-treatments of 40Na2O-30MoO3-30P2O5 (in mol%) glass in a temperature range from 380 (Tg) to 490 °C (Tc) and for 1–24 h. The prepared glass-ceramics contain from 2 to 25 wt.% of crystalline NaMoO2PO4. The sodium-ion conductivity in these materials decreases up to one order of magnitude with an increase in the degree of crystallization due to the immobilization of sodium ions in crystalline NaMoO2PO4. The transport of sodium ions in these materials occurs primarily through the dominant continuous glassy phase, and it is weakly affected by the sporadically distributed crystalline grains. However, the prepared glass-ceramics exhibit high proton conductivity in a humid atmosphere and remarkable humidity-sensing properties; this could be related to crystalline NaMoO2PO4, which provides sites for water adsorption. The glass-ceramic prepared at 450 °C for 24 h shows the best humidity-sensing performance among all samples, showing an increase in proton conductivity for more than seven orders of magnitude with the increase in relative humidity from 0% to 95%. Under a highly humid atmosphere (95% relative humidity and 25 °C), the proton conductivity of this glass-ceramic reaches 5.2 × 10−3 (Ω cm)−1. Moreover, the electrical response of these materials on the change in the relative humidity is linear and reversible in the entire range of the relative humidity, which indicates that they are novel promising candidates for application as humidity sensors.

Plasma Polymerization of Hexamethyldisiloxane and Tetraethoxysilane Thin Films for Humidity Sensing Application

2014 ◽  
Vol 354 ◽  
pp. 41-47 ◽  
Author(s):  
N. Guermat ◽  
A. Bellel ◽  
Salah Sahli ◽  
Yvan Segui ◽  
Patrice Raynaud
Keyword(s):  
Thin Films ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Relative Humidity ◽  
Plasma Polymerization ◽  
Humidity Sensing ◽  
Response And Recovery ◽  
Sensing Application ◽  
Higher Sensitivity ◽  
Humidity Sensing Properties

Humidity sensitive layers elaborated from pure HMDSO and TEOS by PECVD technique have been studied. Humidity sensing properties including impedance relative humidity (RH) and current RH characteristics were investigated. TEOS films show higher sensitivity and excellent linearity over the explored range of humidity (20–95% RH). However, HMDSO films exhibits a small response and recovery of about 8 and 34 s for humidification and desiccation, respectively, in addition to very low hysteresis (2%). Structural analyses of sensitive layers were characterized by Fourier transform infrared spectroscopy (FTIR).

Photoluminescence Properties of Nano-Sized BaO–TiO2–SiO2 System-Based Glass-Ceramics Doped with Er2O3 and Eu2O3

2021 ◽  
Vol 21 (3) ◽  
pp. 1820-1825
Author(s):  
Yoorim Rho ◽  
Seunggu Kang
Keyword(s):  
Glass Ceramic ◽  
Treatment Process ◽  
Red Light ◽  
Glass Ceramics ◽  
Light Transmittance ◽  
Crystal Phase ◽  
Photoluminescence Properties ◽  
Excitation Light ◽  
Prepared Glass ◽  
Luminescence Characteristics

The crystal phase of fresnoite (Ba2TiSi2O8) produced from BaO–TiO2–SiO2 (hereinafter referred to as BTS) has nonlinear optical properties and is capable of emitting ultraviolet light. It can also be utilized in various fields, such as optical communications and optoelectronic devices. In this study, Er and Eu were added to BTS-based glass and a glass-ceramic containing a nano-sized fresnoite crystal phase was prepared through an appropriate heat treatment process. The relationships among the type of crystal phase, the microstructure, the light transmittance capabilities and the PL characteristics of the prepared glass-ceramic were analyzed. In the glass-ceramic of BTS doped with Er, 428 nm light was emitted when excitation light with a 268 nm wavelength was applied, while in the glass-ceramic of BTS doped with Eu, 613 nm red light was emitted when excitation light with a wavelength 394 nm was supplied. The produced fresnoite-based glass-ceramic exhibits transparency and luminescence characteristics due to the nano-sized crystal phase. Therefore, it is likely to find use in various fields in the future.

Relative Humidity Sensing Properties Of Cu[sub 2]O Doped Zno Nanocomposite

2009 ◽  
Author(s):  
N. K. Pandey ◽  
K. Tiwari ◽  
A. Tripathi ◽  
A. Roy ◽  
A. Rai ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Humidity Sensing ◽  
Sensing Properties ◽  
Doped Zno ◽  
Humidity Sensing Properties

scholarly journals The Crystallization Behaviors of SiO2-Al2O3-CaO-MgO-TiO2 Glass-Ceramic Systems

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 794
Author(s):  
Feifei Lai ◽  
Mei Leng ◽  
Jiangling Li ◽  
Qingcai Liu
Keyword(s):  
Mechanical Properties ◽  
Glass Ceramic ◽  
Crystalline Phase ◽  
Three Dimensional ◽  
Glass Ceramics ◽  
Exothermic Peak ◽  
Obvious Effect ◽  
Prepared Glass ◽  
Main Crystalline Phase ◽  
Hardness Values

To evaluate the crystallization behavior of Ti-bearing blast furnace slag-based glass ceramics, SiO2-Al2O3-CaO-MgO-TiO2 systems with various TiO2 were investigated. The crystallization process and mechanical properties were analyzed. The results show that with TiO2 increasing, exothermic peak temperature (Tp) decreases, and the crystallization is promoted by the introduction of TiO2. A small amount of TiO2 (≤4%) addition can significantly promote crystallization, and when TiO2 continues to increase, the crystallization is decreased slightly. The Avrami parameter (n) of all samples is less than 4, indicating that in prepared glass-ceramics, it is hard to achieve three-dimensional crystal growth. The main crystalline phase is akermanite–gehlenite. The addition of TiO2 has no obvious effect on the type of main crystalline phase. The prepared glass-ceramic with 4% TiO2 show good mechanical properties with the hardness values of 542.67 MPa. The recommended content of TiO2 is 4% for preparing glass-ceramics.

Tb-doped Aluminosilicate Oxyfluoride Scintillating Glass and Glass-ceramic

2009 ◽  
Vol 1164 ◽  
Author(s):  
Zhengda Pan ◽  
K. James ◽  
Y. Cui ◽  
A. Burger ◽  
Nerine Cherepy ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Glass Matrix ◽  
Glass Ceramics ◽  
Light Yield ◽  
Oxyfluoride Glass ◽  
Scanning Calorimetry ◽  
Prepared Glass ◽  
Strong Source ◽  
High Light Yield ◽  
Matrix Differential

AbstractTwo aluminosilicate oxyfluoride glass systems, a lead-cadmium-aluminosilicate oxyfluoride and a lithium-lanthanum-aluminosilicate oxyfluoride, doped with different TbF3 concentrations, have been fabricated and investigated. By appropriate heat treatment of the as-prepared glasses above, transparent glass-ceramics (TGC) were obtained. The glass-ceramics contain Tb:Pb(Cd)F2 or Tb:LaF3 nano-crystals in the glass-matrix. Differential scanning calorimetry, Raman scattering, and luminescence under both UV and β-particle excitation have been investigated on as-prepared glasses and glass-ceramics. It has been found that the terbium-doped lithium-lanthanum-aluminosilicate oxyfluoride glass exhibits good UV excited luminescence and β-induced luminescence. The luminescence yield increases for glass-ceramic compared to that of the as-prepared glass. The including of LaF3 in the glass-matrix is beneficial for a higher Tb-doping concentration and a high light yield. The light yield of lithium-lanthanum-aluminosilicate oxyfluoride glass and glass-ceramic is comparable to that of Schott IQI-301 product. However, the terbium-doped lead-cadmium-aluminosilicate oxyfluoride glass and glass-ceramic have a detrimental luminescence performance. The lead cations in the glass-matrix may create non-bridging oxygen defects, which are a strong source of charge traps, and correlated to a strong Raman “Boson” peak.

scholarly journals Humidity-Sensing Properties of an 1D Antiferromagnetic Oxalate-Bridged Coordination Polymer of Iron(III) and Its Temperature-Induced Structural Flexibility

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5543
Author(s):  
Sanja Burazer ◽  
Krešimir Molčanov ◽  
Ana Šantić ◽  
Teodoro Klaser ◽  
Emmanuel Wenger ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Proton Conductivity ◽  
Linear Thermal Expansion ◽  
Carbonyl Oxygen ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Humidity Sensing ◽  
Sensing Properties ◽  
Thermal Expansion Coefficients ◽  
Humidity Sensing Properties

A novel one-dimensional (1D) oxalate-bridged coordination polymer of iron(III), {[NH(CH3)(C2H5)2][FeCl2(C2O4)]}n (1), exhibits remarkable humidity-sensing properties and very high proton conductivity at room temperature (2.70 × 10−4 (Ω·cm)−1 at 298 K under 93% relative humidity), in addition to the independent antiferromagnetic spin chains of iron(III) ions bridged by oxalate groups (J = −7.58(9) cm−1). Moreover, the time-dependent measurements show that 1 could maintain a stable proton conductivity for at least 12 h. Charge transport and magnetic properties were investigated by impedance spectroscopy and magnetization measurements, respectively. Compound 1 consists of infinite anionic zig-zag chains [FeCl2(C2O4)]nn− and interposed diethylmethylammonium cations (C2H5)2(CH3)NH+, which act as hydrogen bond donors toward carbonyl oxygen atoms. Extraordinarily, the studied coordination polymer exhibits two reversible phase transitions: from the high-temperature phase HT to the mid-temperature phase MT at T ~213 K and from the mid-temperature phase MT to the low-temperature phase LT at T ~120 K, as revealed by in situ powder and single-crystal X-ray diffraction. All three polymorphs show large linear thermal expansion coefficients.

scholarly journals Augite-anorthite glass-ceramics from residues of basalt quarry and ceramic wastes

2015 ◽  
Vol 9 (2) ◽  
pp. 117-123 ◽  
Author(s):  
Gamal Khater ◽  
Safiah Abu ◽  
Esmat Hamzawy
Keyword(s):  
Thermal Expansion ◽  
Glass Ceramic ◽  
Crystallization Process ◽  
Coefficient Of Thermal Expansion ◽  
Glass Ceramics ◽  
Ceramic Samples ◽  
Heat Treated ◽  
Prepared Glass ◽  
Higher Temperature ◽  
Dominant Phase

Dark brown glasses were prepared from residues of basalt quarries and wastes of ceramic factories. Addition of CaF2, Cr2O3 and their mixture CaF2-Cr2O3 were used as nucleation catalysts. Generally, structures with augite and anorthite as major phases and small amount of magnetite and olivine phases were developed through the crystallization process. In the samples heat treated at 900?C the dominant phase is augite, whereas the content of anorthite usually overcomes the augite at higher temperature (1100?C). Fine to medium homogenous microstructures were detected in the prepared glass-ceramic samples. The coefficient of thermal expansion and microhardnessmeasurements of the glass-ceramic samples were from 6.16?10-6 to 8.96?10-6?C-1 (in the 20-500?C) and 5.58 to 7.16GP, respectively.

Crystallization and sodium-ion conduction properties of glass–ceramic solid solutions of Na5FeSi4O12 and Na4ZrSi4O12

2020 ◽  
pp. 2141001
Author(s):  
Koji Kawada ◽  
Kimihiro Yamashita ◽  
Toshinori Okura
Keyword(s):  
Solid Solutions ◽  
Glass Ceramic ◽  
Single Phase ◽  
Glass Ceramics ◽  
Ionic Conductivities ◽  
Sodium Ion ◽  
Conduction Path ◽  
Text Type ◽  
Conductive Glass ◽  
Conduction Properties

This study focused on the effect of Zr-inclusion on Na[Formula: see text] conduction properties of the newly developed glass–ceramic solid solutions of Na5FeSi4O[Formula: see text] and Na4ZrSi4O[Formula: see text]. We experimentally confirmed formation of an all proportional solid solution in the range of [Formula: see text]= 0 and 1.0 with the composition Na[Formula: see text]Fe[Formula: see text]Zr[Formula: see text]Si4O[Formula: see text]. Glass–ceramic with a fast Na[Formula: see text]-conducting Na5YSi4O[Formula: see text]-type single phase was obtained in all the solid solutions. The conduction properties of the glass–ceramics were improved with increasing content of Zr, and Na4ZrSi4O[Formula: see text] was the most conductive glass–ceramic. The ionic conductivities were as high as 1.9 × 10[Formula: see text] S cm[Formula: see text] and 9.3 × 10[Formula: see text] S cm[Formula: see text] at temperatures of 25[Formula: see text]C and 300 [Formula: see text]C, respectively. The improved conductivity was attributed to the expansion of the conduction path by larger Zr ions replacing FeO6 octahedra.

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