Glossary entry (derived from question below)
French term or phrase:
conditions de surstoechiométrie temporaire
English translation:
temporary superstoichiometric conditions
Added to glossary by
MoiraB
Feb 2, 2005 16:12
19 yrs ago
French term
conditions de surstoechiométrie temporaire
French to English
Science
Science (general)
'Surstoechiométrie' gets a few Googles but it's not clear to me what it means or how it differs from 'stoechiométrie'. Can anyone help, please?
a) Conditions de mise en solution et de reprécipation de MgO
Le processus destiné à l’introduction de précipités intragranulaires débute parr la mise en solution de l’oxyde alcalino-terreux dans l’UO2+x.
Conditions expérimentales des frittages en conditions de surstoechiométrie temporaire :
* atmosphère: CO2 plus 10 vpm O2;
* montée en température: 150 K.h-1; descente: 300 K.h-1;
* palier de 2 heures à 1200°C, 1400°C ou 1600°C (-110 < RTln(pO2) < -80 kJ.mol-1)
a) Conditions de mise en solution et de reprécipation de MgO
Le processus destiné à l’introduction de précipités intragranulaires débute parr la mise en solution de l’oxyde alcalino-terreux dans l’UO2+x.
Conditions expérimentales des frittages en conditions de surstoechiométrie temporaire :
* atmosphère: CO2 plus 10 vpm O2;
* montée en température: 150 K.h-1; descente: 300 K.h-1;
* palier de 2 heures à 1200°C, 1400°C ou 1600°C (-110 < RTln(pO2) < -80 kJ.mol-1)
Proposed translations
(English)
| 1 +2 | temporary superstoichiometric conditions |
Helen Genevier
|
| 4 | temporary conditions greater than stoichiometry |
Hervé du Verle
|
| 3 | conditions of temporary over-stoichiometry |
David Sirett
|
Proposed translations
+2
21 mins
French term (edited):
conditions de surstoechiom�trie temporaire
Selected
temporary superstoichiometric conditions
Just a guess, but I'd say stoichiometric conditions would be when you combine reagents 1:1 to make say CO or 1:2 to make CO2, whereas superstoichiometric conditions would be where you provide a large excess of one reagent
Reference:
Peer comment(s):
| agree |
Kelvin Wu
11 hrs
|
| agree |
Zareh Darakjian Ph.D.
: Good explanation! Stoichiometric means that the reactants are in the proportions defined by the equation.
1 day 3 hrs
|
4 KudoZ points awarded for this answer.
Comment: "Yes, I'm happy with that. Certainly when you google for superstoichiometric or superstoichiometry with its opposite number substoichiometric/ substoichiometry, this combination comes up more often than over(-)stoichiometric)stoichiometry. Thanks."
18 mins
French term (edited):
conditions de surstoechiom�trie temporaire
conditions of temporary over-stoichiometry
"over-stoichiometry" and its opposite seem to be used, though the ref given below is one of few 'good' googles.
5 hrs
Hervé du Verle
Native in French
Works in field
23 yrs in French medical edition
Native in: French (Variant: Canadian) 
Works in: English to French, French to English, English, and 1 more.
French term (edited):
conditions de surstoechiom�trie temporaire
temporary conditions greater than stoichiometry
More than 80 hits with "greater than stoichiometry"
Quotations from "Concise encyclopedia of chemistry" McGraw-Hill ed, 2004
"In a general usage, the term stoichiometry refers to the relationship between the measured quantities of substances or of energy involved in a chemical reaction; the calculations of these quantities include the assumption of the validity of the laws of definite proportions and of conservation of matter and energy.
A typicial stoichiometric problem involves predicting the weight of reactant needed to produce a desired amount of a product in a chemical reaction.
.../...
Nonstoichiometric compounds are chemical compounds in which the relative number of atoms is not expressible as the ratio of small whole numbers, hence compouds for which the subscripts in the chemical formula are not rational (for example Cu1.987 S)"
.../...
ex of binary compouds:
1. Metal nonmetal ratio greater than sthoichiometric
...
2. ... ratio less than stoichiomeric
....
Hope this helps!
Quotations from "Concise encyclopedia of chemistry" McGraw-Hill ed, 2004
"In a general usage, the term stoichiometry refers to the relationship between the measured quantities of substances or of energy involved in a chemical reaction; the calculations of these quantities include the assumption of the validity of the laws of definite proportions and of conservation of matter and energy.
A typicial stoichiometric problem involves predicting the weight of reactant needed to produce a desired amount of a product in a chemical reaction.
.../...
Nonstoichiometric compounds are chemical compounds in which the relative number of atoms is not expressible as the ratio of small whole numbers, hence compouds for which the subscripts in the chemical formula are not rational (for example Cu1.987 S)"
.../...
ex of binary compouds:
1. Metal nonmetal ratio greater than sthoichiometric
...
2. ... ratio less than stoichiomeric
....
Hope this helps!
Discussion