how i can find out the surface area by XRD determined crystallite size of the two phases TiO2 ? please help me in this regard.
Thanks
Hello Huang
To my own knowledge XRD is useful in studying the bulk properties of the crystalline materials not the surface itself.
There are many ways to study the surface area, why not use them?
Sir,Thanks for your response. I want to estimate the surface area by the crystallite size found by XRD. Can you tell me other ways to calculate surface area? Thanks.
The surface area is not detectable by XRD. You can use for example the classical N2 adsorption measurements.
The BET method , N2 adsorption, is useful.
Acetic acid adsorption is also useful.
These are easy and straightforward. Just see the procedure in literature.
Are you talking about the an oxidation layer or coating, or a bulk material? In case of a thin layer, how big is it? Do you have some SEM images of the relevant cross section?
Hi Nolze, Its in the form of fiber.I have got the XRD, not the crossectional SEM image. I want to estimate the surface area.
Well, the important question for me is: Is the crystal size in the scale of the layer thickness? Are you talking about a coating or about bulk material? From this side it is irrelevant whether it is a fibre texture or not, at least at the first glance.
What is your sample morphology? What is your size range? Post some data and images. Micro-graphs of your materials would help. Maybe even some existing literature that you have investigated already.
XRD is the most favored tool for "crystallite" size measurements. The term "crystallite" or "diffracting domain" take on different magnitude in mono-crystals versus Nano crystals.
Describe your situation better and in detail to get the best response from the expert RG membership.
I just want to know that what is the formula to estimate the surface area of TiO2 having two phases, not the exact value by BET.
To get surface area you must assume domain shape. XRD gives you diffracting volume.
You may also need to use TEM to estimate domain shape. Are the two phases of similar Nano shape?
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