THERMOLUMINESCENCE IN ALKALINE-EARTH DOPED KCl IRRADIATED AT ROOM TEMPERATURE

1976 ◽  
Vol 37 (C7) ◽  
pp. C7-158-C7-158
Author(s):  
A. RASCÓN ◽  
J. L. ALVAREZ RIVAS
Keyword(s):  
Alkaline Earth ◽  
Room Temperature

scholarly journals Supramolecular Frameworks Based on Rhenium Clusters Using the Synthons Approach

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2662
Author(s):  
Nathalie Audebrand ◽  
Antoine Demont ◽  
Racha El Osta ◽  
Yuri V. Mironov ◽  
Nikolay G. Naumov ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Crystal Structures ◽  
Ligand Exchange ◽  
Alkaline Earth ◽  
Room Temperature ◽  
Hydration Rate ◽  
Rhenium Cluster ◽  
New Compounds ◽  
Cluster Unit

The reaction of the K4[{Re6Si8}(OH)a6]·8H2O rhenium cluster salt with pyrazine (Pz) in aqueous solutions of alkaline or alkaline earth salts at 4 °C or at room temperature leads to apical ligand exchange and to the formation of five new compounds: [trans-{Re6Si8}(Pz)a2(OH)a2(H2O)a2] (1), [cis-{Re6Si8}(Pz)a2(OH)a2(H2O)a2] (2), (NO3)[cis-{Re6Si8}(Pz)a2(OH)a(H2O)a3](Pz)·3H2O (3), [Mg(H2O)6]0.5[cis-{Re6Si8}(Pz)a2(OH)a3(H2O)a]·8.5H2O (4), and K[cis-{Re6Si8}(Pz)a2(OH)a3(H2O)a]·8H2O (5). Their crystal structures are built up from trans- or cis-[{Re6Si8}(Pz)a2(OH)a4−x(H2O)ax]x−2 cluster units. The cohesions of the 3D supramolecular frameworks are based on stacking and H bonding, as well as on H3O2−bridges in the cases of (1), (2), (4), and (5) compounds, while (3) is built from stacking and H bonding only. This evidences that the nature of the synthons governing the cluster unit assembly is dependent on the hydration rate of the unit.

Doping alkaline-earth: a strategy of stabilizing hexagonal GdF3 at room temperature

2013 ◽  
Vol 42 (43) ◽  
pp. 15482 ◽  
Author(s):  
Qi Zhao ◽  
Baiqi Shao ◽  
Wei Lü ◽  
Yongchao Jia ◽  
Wenzhen Lv ◽  
...  
Keyword(s):  
Alkaline Earth ◽  
Room Temperature

A Study on Electrical Resistivity of BaO–CaO–SiO2–Al2O3 Seal Glass Used in Solid Oxide Electrolytic Cell (SOEC)

2012 ◽  
Vol 512-515 ◽  
pp. 1574-1578 ◽  
Author(s):  
Jie Hao ◽  
Chang Sheng Deng ◽  
Qing Feng Zan ◽  
Jing Ming Xu
Keyword(s):  
Electrical Resistivity ◽  
High Temperature ◽  
Field Strength ◽  
Alkaline Earth ◽  
Room Temperature ◽  
Electrolytic Cell ◽  
Solid Oxide ◽  
Average Field ◽  
Impedance Analyzer

The electrical resistivty (R) of BaO–CaO–SiO2–Al2O3 (BCSA) based glass, which was used in SOEC, was measured by impedance analyzer from room temperature to sealing temperature, and it was founded that electrical resistivity of all seal glass decreases with temperature. When temperature is lower than the soften temperature of glass, the electrical resistivity of all seal glass was no less than 107Ω∙cm. At 850°C, the resistivity of the 16BaO–16CaO–42SiO2–8Al2O3 glass (G1) reached 4.40×106Ω∙cm, and even at the sealing temperature, their resistivity was still above 105-106Ω∙cm. With the decrease of ratio of Si/B from 3 to 1, the electrical resistivity of glass decreased from 4.40×106Ω∙cm to 8.96×104Ω∙cm. The electrical resistivity of glass in BCSA system could be significantly affected by B2O3 and alkaline earth oxides. The results show that the electrical resistivity of glass was improved with the increasing of non-bridging oxygen and the average field strength. All glasses can be used as sealants at high temperature with no electrical shunting in SOEC.

scholarly journals Sintering Behavior of BST Nanoparticles at Low Temperature and Electrical Properties of their Ceramics

2020 ◽  
Author(s):  
Jianquan Qi ◽  
Yan Li ◽  
Mengyin Li ◽  
Jiahui Xie ◽  
Tianchi Yu ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Dielectric Constant ◽  
Alkaline Earth ◽  
Room Temperature ◽  
Sintering Temperature ◽  
Sintering Behavior ◽  
Sintering Aids ◽  
Bst Ceramics ◽  
Related Compounds ◽  
Alkaline Earth Cations

Abstract The powders of the Ba0.75Sr0.25TiO3 (BST) nanoparticles were directly synthesized by milling of Ba(OH)2·8H2O, Sr(OH)2·8H2O and Ti(BuO)4 in ethanol at room temperature. They have homogenous grains of ~15 nm and the high sintering activity. The dense ceramics with the density >90% can be obtained at a sintering temperature of ≤950 oC by them with adding 3 wt% sintering aids of Bi2O3 and Li2CO3. The sintering behavior of the BST nanoparticles by adding the aids of Bi2O3 and Li2CO3 is studied carefully. Several Bi-related compounds are involved in the sintering procedure at a different temperature. They enhance the mass transfer and promote the sintering densification. These compounds such as Ba2BiO4 and SrBiO4 appear at 800 oC, LiBa4Bi3O11 and Sr1.2Bi0.8O3 appear over 830 oC, and Bi8.11Ba0.89O13.05 appears at 950 oC. The cation Bi in the ceramics has mixture valences of 3+ and 5+. It makes the ceramics as semiconducting state with the dark gray color and decreases the ceramics resistivities. With the sintering temperature increase, especially at 950 oC, the cation Bi tends back to single valence of +3 in the ceramics. The most of alkaline earth cations in Bi-related compounds will release and resorb into the lattice of BST and drive the densification of the nanoparticles. The BST ceramics can have a peak dielectric constant >6500 at 53 oC, loss <0.025, and resistivity >1012 W·cm when sintered at a temperature of ≥900 oC with 3 wt% sintering aids. They have a potential application for multiple layer ceramic capacitors (MLCC) with silver inner-electrodes.

IR study on adsorption of carbon dioxide on alkaline earth metal ion-exchanged titanate nanotubes at room temperature

2020 ◽  
Vol 109 ◽  
pp. 103088
Author(s):  
Eri Uematsu ◽  
Atsushi Itadani ◽  
Kazuyoshi Uematsu ◽  
Kenji Toda ◽  
Mineo Sato
Keyword(s):  
Carbon Dioxide ◽  
Metal Ion ◽  
Alkaline Earth ◽  
Room Temperature ◽  
Earth Metal ◽  
Titanate Nanotubes ◽  
Alkaline Earth Metal ◽  
Ir Study

Metal carbonates-induced solution-free dehydrogenation of alkaline earth metal hydrides at room temperature

2020 ◽  
Vol 289 ◽  
pp. 121485
Author(s):  
Song Zhang ◽  
Lu Wang ◽  
Yun-Long Tai ◽  
Yun-Lei Teng ◽  
Juan Zhao ◽  
...  
Keyword(s):  
Alkaline Earth ◽  
Room Temperature ◽  
Metal Hydrides ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Metal Carbonates
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