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conditions de surstoechiométrie temporaire

English translation: temporary superstoichiometric conditions

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
French term or phrase:conditions de surstoechiométrie temporaire
English translation:temporary superstoichiometric conditions
Entered by: MoiraB

16:12 Feb 2, 2005
French to English translations [PRO]
Science - Science (general)
French term or phrase: conditions de surstoechiométrie temporaire
'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)
MoiraB
France
Local time: 10:15
temporary superstoichiometric conditions
Explanation:
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
Selected response from:

Helen Genevier
France
Local time: 10:15
Grading 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.
4 KudoZ points were awarded for this answer



Summary of answers provided
4temporary conditions greater than stoichiometry
Hervé du Verle
3conditions of temporary over-stoichiometry
David Sirett
1 +2temporary superstoichiometric conditions
Helen Genevier


Discussion entries: 1





  

Answers


18 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5
conditions de surstoechiométrie temporaire
conditions of temporary over-stoichiometry


Explanation:
"over-stoichiometry" and its opposite seem to be used, though the ref given below is one of few 'good' googles.


    Reference: http://www.iop.org/EJ/abstract/0268-1242/11/3/004
David Sirett
Local time: 10:15
Specializes in field
Native speaker of: Native in EnglishEnglish
PRO pts in category: 4
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21 mins   confidence: Answerer confidence 1/5Answerer confidence 1/5 peer agreement (net): +2
conditions de surstoechiométrie temporaire
temporary superstoichiometric conditions


Explanation:
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: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&d...
    Reference: http://www.pnas.org/cgi/content/full/101/26/9867
Helen Genevier
France
Local time: 10:15
Native speaker of: Native in EnglishEnglish
PRO pts in category: 8
Grading 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.

Peer comments on this answer (and responses from the answerer)
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
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5 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5
conditions de surstoechiométrie temporaire
temporary conditions greater than stoichiometry


Explanation:
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!


Hervé du Verle
Local time: 04:15
Works in field
Native speaker of: Native in FrenchFrench
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