High-temperature dynamic octahedral tilting in the ionic conductor Sr11Mo4O23

2016 ◽  
Vol 49 (1) ◽  
pp. 78-84 ◽  
Author(s):  
Carlos A. López ◽  
José C. Pedregosa ◽  
María T. Fernández-Díaz ◽  
José A. Alonso
Keyword(s):  
High Temperature ◽  
Thermal Evolution ◽  
Ionic Conductor ◽  
Structure Evolution ◽  
Neutron Powder Diffraction Data ◽  
Crystal Network ◽  
Difference Fourier ◽  
The Relationship ◽  
Strontium Cation ◽  
Temperature Dynamic

This work presents the crystal structure evolution of a novel ionic conductor Sr11Mo4O23at high temperature. The formula of this phase can be rewritten as Sr1.75□0.25SrMoO5.75, highlighting the relationship with double perovskitesA2B′B′′O6. The crystal network contains oxygen-anion and strontium-cation vacancies. The structure is complex; Sr, Mo and O atoms are distributed in four, two and six distinct Wyckoff sites, respectively. It was refined from neutron powder diffraction data collected at 473, 673, 873 and 1073 K. The thermal evolution of crystallographic parameters supports the known reversible process of removal/uptake of O-atom content in the 673–873 K temperature range. Above 873 K, from difference Fourier maps, it was found that the structure exhibits an oxygen delocalization around one of the Mo sites. This delocalization was understood as a dynamical octahedral tilt of the MoO6octahedron, yielding an increase in the ionic conductivity at high temperature.

scholarly journals The modification effect of temperature on the relationship between air pollutants and daily incidence of influenza in Ningbo, China

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Rui Zhang ◽  
Yujie Meng ◽  
Hejia Song ◽  
Ran Niu ◽  
Yu Wang ◽  
...  
Keyword(s):  
Air Pollution ◽  
High Temperature ◽  
Air Pollutants ◽  
Meteorological Data ◽  
Effect Of Temperature ◽  
Distributed Lag ◽  
Modification Effect ◽  
Incidence Risk ◽  
The Impact ◽  
The Relationship

Abstract Background Although exposure to air pollution has been linked to many health issues, few studies have quantified the modification effect of temperature on the relationship between air pollutants and daily incidence of influenza in Ningbo, China. Methods The data of daily incidence of influenza and the relevant meteorological data and air pollution data in Ningbo from 2014 to 2017 were retrieved. Low, medium and high temperature layers were stratified by the daily mean temperature with 25th and 75th percentiles. The potential modification effect of temperature on the relationship between air pollutants and daily incidence of influenza in Ningbo was investigated through analyzing the effects of air pollutants stratified by temperature stratum using distributed lag non-linear model (DLNM). Stratified analysis by sex and age were also conducted. Results Overall, a 10 μg/m3 increment of O3, PM2.5, PM10 and NO2 could increase the incidence risk of influenza with the cumulative relative risk of 1.028 (95% CI 1.007, 1.050), 1.061 (95% CI 1.004, 1.122), 1.043 (95% CI 1.003, 1.085), and 1.118 (95% CI 1.028, 1.216), respectively. Male and aged 7–17 years were more sensitive to air pollutants. Through the temperature stratification analysis, we found that temperature could modify the impacts of air pollution on daily incidence of influenza with high temperature exacerbating the impact of air pollutants. At high temperature layer, male and the groups aged 0–6 years and 18–64 years were more sensitive to air pollution. Conclusion Temperature modified the relationship between air pollution and daily incidence of influenza and high temperature would exacerbate the effects of air pollutants in Ningbo.

Influence of Enzyme Activity of Bacteria and Leucocytes in Raw Milk on Age Gelation after UHT Processing

1984 ◽  
Vol 47 (2) ◽  
pp. 105-107 ◽  
Author(s):  
BARBARA P. KEOGH ◽  
G. PETTINGILL
Keyword(s):  
Enzyme Activity ◽  
High Temperature ◽  
Inhibitory Action ◽  
Raw Milk ◽  
Bacterial Counts ◽  
High Temperature Processing ◽  
The Relationship ◽  
Ultra High Temperature

An investigation was undertaken into the relationship between the enzyme activity of cells harvested from raw milk and time taken for age gelation (TAG) to occur in the milk after ultra-high-temperature processing. It was shown that there was no relationship between the TAG and the bacterial counts on milk agar at 30°C or 7°C nor was there a relationship between the counts and the level of enzyme activity of the harvested cells. There was, however, a significant correlation between the level of enzyme activity of the harvested cells and the TAG. When extra bovine leucocytes were added to raw milk before processing, the TAG was increased. This suggested that there was an inhibitory action of leucocytes in development of age gelation.

SIMS and thermal evolution analysis of oxygen in Zr-1%Nb alloy after high-temperature transitions

2010 ◽  
Vol 43 (1-2) ◽  
pp. 618-620 ◽  
Author(s):  
J. Lorincik ◽  
V. Klouc̆ek ◽  
M. Negyesi ◽  
J. Kabátová ◽  
L. Novotný ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Evolution ◽  
Evolution Analysis

Influence of powder characteristics on the properties of green compacts of Bi-2212 powders

1997 ◽  
Vol 12 (1) ◽  
pp. 21-27 ◽  
Author(s):  
D.-W. Yuan ◽  
M. D. Aesoph ◽  
J. Kajuch
Keyword(s):  
High Temperature ◽  
Confining Pressure ◽  
Plastic Behavior ◽  
Particle Sizes ◽  
Green Density ◽  
High Temperature Superconducting ◽  
Powder Characteristics ◽  
The Relationship ◽  
Powder In Tube ◽  
Superconducting Applications

With the growing potential for use of Bi-2212 powders in high temperature superconducting applications, it is important to understand the processing characteristics of the material. To meet this need, the present work established the relationship between confining pressure and green density for powders of different particle sizes and morphologies. Mechanical properties, including elastic and plastic behavior, of the resulting green compacts were also measured as a function of relative density. Particle size and size distribution are shown to have a significant impact on the properties of interest. The implications of such findings are discussed with respect to the powder-in-tube process for making high temperature superconducting wire and tape.

scholarly journals Phase competition and anomalous thermal evolution in high-temperature superconductors

2017 ◽  
Vol 96 (4) ◽  
Author(s):  
Zuo-Dong Yu ◽  
Yuan Zhou ◽  
Wei-Guo Yin ◽  
Hai-Qing Lin ◽  
Chang-De Gong
Keyword(s):  
High Temperature ◽  
Thermal Evolution ◽  
High Temperature Superconductors ◽  
Phase Competition

scholarly journals The strongly defective double perovskite Sr11Mo4O23: crystal structure in relation to ionic conductivity

2014 ◽  
Vol 47 (4) ◽  
pp. 1395-1401 ◽  
Author(s):  
Carlos A. López ◽  
José C. Pedregosa ◽  
Diego G. Lamas ◽  
José A. Alonso
Keyword(s):  
Crystal Structure ◽  
Ionic Conductivity ◽  
Powder Diffraction ◽  
Double Perovskite ◽  
Ionic Mobility ◽  
Neutron Powder Diffraction Data ◽  
Complex Crystal Structure ◽  
Citrate Precursors ◽  
The Relationship ◽  
Complex Crystal

The crystal structure and ionic conductivity properties of a novel microcrystalline Sr11Mo4O23ceramic material are presented. This material has been prepared by thermal treatment up to 1473 K, in air, of previously decomposed citrate precursors. The complex crystal structure was refined from combined X-ray powder diffraction and neutron powder diffraction data. The formula of this phase can be rewritten as Sr1.75□0.25SrMoO5.75, highlighting the relationship with double perovskitesA2B′B′′O6. At room temperature, the crystal structure is tetragonal in space groupI41/a, witha= 11.6107 (6) Å,c= 16.422 (1) Å andV = 2213.8 (2) Å3. The crystal network contains O anion and Sr cation vacancies. The structure is complex, with Sr, Mo and O atoms distributed over four, two and six distinct Wyckoff sites, respectively. Only one of the Sr sites (SrO6) corresponds to the octahedral network; one of the two MoO6types of octahedra is axially distorted. The three other Sr positions occupy theAsite with higher coordination. There is an occupational deficit of O atoms of 22 (4)%. This defective framework material presents an interesting ionic mobility, enhanced above 773 K owing to a further reduction in the oxygen content.

The Relationship Between Potato Pollen and True Seed: Effects of High Temperature and Pollen Size

1988 ◽  
pp. 285-290
Author(s):  
N. Pallais ◽  
D. Mulcahy ◽  
N. Fong ◽  
R. Falcon ◽  
P. Schmiediche
Keyword(s):  
High Temperature ◽  
Pollen Size ◽  
True Seed ◽  
The Relationship
Sign in / Sign up

Export Citation Format

Share Document