The calcium fluoride effect on properties of cryolite melts feasible for low-temperature production of aluminum and its alloys

2017 ◽  
Author(s):  
O. Tkacheva ◽  
A. Dedyukhin ◽  
A. Redkin ◽  
Yu. Zaikov
Keyword(s):  
Low Temperature ◽  
Calcium Fluoride

Crystallization Characteristics and Thermal Stability of Fluor-Hydroxyapatite Composites with Zirconia

2012 ◽  
Vol 182-183 ◽  
pp. 122-125
Author(s):  
Li Li Wang ◽  
Xiu Feng Wang ◽  
Cheng Long Yu ◽  
Hong Tao Jiang
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Solid State ◽  
Low Temperature ◽  
Solid Solutions ◽  
Tricalcium Phosphate ◽  
Solid State Reaction ◽  
Calcium Fluoride ◽  
Raw Materials ◽  
Thermal Stability Of

Hydroxyapatite (HA) was synthesized in presence of 20wt% m-ZrO2by solid state reaction between tricalcium phosphate(TCP) and Ca(OH)2at 1000 °C for 2h. Similarily, Fluorine hydroxyapatite(FA) was synthesized using tricalcium phosphate and calcium fluoride as raw materials at 1000 °Cfor 3h. The as-prepared HA was mixed with 10%,25%,45%,55%,70wt% FA and the mixture was sintered at 1000°C-1400°C for 2h. The main phase and bulk density was measured. The results show that when the relative amount of FA to HA increased, the decomposition of the composite is decreased gradually because of the formation of thermally stable FHA solid solutions. Low temperature would effect the exchange of ionic between FA and HA,while high temperature would impact synthesis of composites, because high temperature would lead to dissolution of HA ,which has to react with FA. Increase the content of HA would be advantage for synthesis FHA-ZrO2composite.

Study of low temperature luminescence and thermoluminescence in calcium fluoride crystals

1991 ◽  
Vol 48-49 ◽  
pp. 828-832 ◽  
Author(s):  
K. Chakrabarti ◽  
V.K. Mathur ◽  
R.J. Abbundi ◽  
N. Kristianpoller ◽  
W.F. Hornyak
Keyword(s):  
Low Temperature ◽  
Calcium Fluoride ◽  
Fluoride Crystals

scholarly journals A study on the low-temperature wet synthesis of hydrofluoric acid from synthetic calcium fluoride and waste sulfuric acid

2020 ◽  
Vol 463 ◽  
pp. 012098
Author(s):  
Min-Fa Lin ◽  
Chih-Ping Chang ◽  
Ken-Lin Chang ◽  
Wen-Jhy Lee ◽  
Jhong-Lin Wu ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Low Temperature ◽  
Calcium Fluoride ◽  
Hydrofluoric Acid ◽  
Wet Synthesis

The Effect of Calcium Fluoride on Alumina Solubility in Low Temperature Cryolite Melts

2013 ◽  
pp. 685-688
Author(s):  
P. Tingaev ◽  
Yu. Zaikov ◽  
A. Apisarov ◽  
A. Dedyukhin ◽  
A. Redkin
Keyword(s):  
Low Temperature ◽  
Calcium Fluoride ◽  
Alumina Solubility

Recycling of calcium fluoride sludge as ceramic material using low temperature sintering technology

2013 ◽  
Vol 16 (1) ◽  
pp. 156-161 ◽  
Author(s):  
Ping Zhu ◽  
Zhen Bang Cao ◽  
Liang You Wang ◽  
Yi Li Ye ◽  
Guang Ren Qian ◽  
...  
Keyword(s):  
Low Temperature ◽  
Ceramic Material ◽  
Calcium Fluoride ◽  
Low Temperature Sintering

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

Low temperature x-ray microanalysis of frozen-hydrated tobacco leaves

1984 ◽  
Vol 42 ◽  
pp. 284-285
Author(s):  
S. Edith Taylor ◽  
Patrick Echlin ◽  
May McKoon ◽  
Thomas L. Hayes
Keyword(s):  
Low Temperature ◽  
Lemna Minor ◽  
Root Tips ◽  
Tobacco Leaves ◽  
X Ray ◽  
Whole Cells ◽  
Carbon Coated ◽  
The Right ◽  
Beam Currents ◽  
The University

Low temperature x-ray microanalysis (LTXM) of solid biological materials has been documented for Lemna minor L. root tips. This discussion will be limited to a demonstration of LTXM for measuring relative elemental distributions of P,S,Cl and K species within whole cells of tobacco leaves.Mature Wisconsin-38 tobacco was grown in the greenhouse at the University of California, Berkeley and picked daily from the mid-stalk position (leaf #9). The tissue was excised from the right of the mid rib and rapidly frozen in liquid nitrogen slush. It was then placed into an Amray biochamber and maintained at 103K. Fracture faces of the tissue were prepared and carbon-coated in the biochamber. The prepared sample was transferred from the biochamber to the Amray 1000A SEM equipped with a cold stage to maintain low temperatures at 103K. Analyses were performed using a tungsten source with accelerating voltages of 17.5 to 20 KV and beam currents from 1-2nA.

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