Hi all
I am synthesizing ZnO-SnO2 and ZnO-TiO2 nanocomposite by sol-gel method. I want to do sintering of this sample. Can anyone tell me till what temperature i can heat my sample.
About TiO2: it excist in basicly in 2 crystalographic forms, rutile and anatase, whereas rutile is stable, anatase will transform into rutile. This transformation is not starting at a specific temperature, but will depend on a lot of factors, I would say, to be sure don't exceed 400 C. If you want to sinter TiO2, you need more information. ZnO and SnO2 is out of my expertice, sorry
There aren't any recommended temperature and it is up to you what application you are using it for . or just want to study the structural change or structura . The nano composite easily withstand ( remain stable ) up to 800 0C.
For TiO2, depending on what form of the material you want to end up with, you can go up to 400 oC. ZnO and composite ZnO/TiO2 films are fine up to this temperature, although ideally I would recommend up to 350 oC for ZnO composites.
I not sure if your question is clear. The answers aren't. Please specify if you want to sinter resulting in a workpiece or to you want to have a fine crystalline powder (Rutil or Anatas)(recommended for what). In any case temperature dependent investigations will help (DSC, TGA or XRD after different heating times)
Calcination or sintering temperature depens on many critical parameters
like (i) your precoursor decomposition temperature if you have any salt complex which consist a carbon containg ligand then you must aware about the complete carbon removal temperature, (ii) formation and stability of your expected phase etc.
First run TGA of your sample. It will show you the temperature required to calcinate the sample. From TGA curve you will know the desired temperature for your analysis.
First you run TGA and DTG.... then you will be able to know decomposition phases of your sample. Then I think you will be able to choose a particular temperature at which you can sinter or calcine your sample.
I have sintered ZnO powders at around 850 degree temperature for 12 hours in air. You can see my paper in the given link https://www.researchgate.net/publication/257792716_Structural_and_optical_properties_of_pure_and_Al_doped_ZnO_nanocrystals
Also you can see my other papers on SnO2
Article Structural and optical properties of pure and Al doped ZnO n...
Different metal oxides have a different geometric structure, you want to choose the structure : temperature setting, can be taken consideration by TGA-DTA
Are you prioritizing structure geometry oxide ZnO or TiO2, and more precise measure TGA-DTA.
ZnO has a geometrical structure more than one. While TiO2 anatase 400-500C and rutile is no greater than 500C. If you do ZnO doped TiO2, and you will maintain TiO2 anatase phase at high temperatures. setting temperature
What is the purpose of heating ? you can see my papaer Annealing effects on ZnO nanoparticles.
@sowribabu can u attach the link of ur paper. Thank you Yetria rilda. I am trying to dope ZnO-TiO2 and ZnO-SnO2.
Dear all
You are required to bother about 1. structure 2. fuel used. 3. particle size. Please question yourself why should you try the one material already synthesised. Read articles which have shown some optimization of thermal history of samples. Infuse novelty by understanding it with on-hand experience.
wish you success.
With titania you will safely preserve anatase phase at a temperature below 500 degrees celsius
Go for thermal analysis for your starting precursor, that will give you the exact temperature values for sintering.
Check these paper, we compared nanocrystalline SnO2 before and after annealing at diff temp. Also Cobalt doped SnO2 by sol-gel method.
Article Nanoparticle size, oxidation state, and sensing response of ...
Article Modification of the structural and optical properties of tin...
you can go till 600 degree centigrade for sintering by using muffle furnace , for physical deposition method.
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