XRD nano-hydroxyapatite

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In summary, the person is asking for help in interpreting Xrd data for hydroxyapatite nanopowder. They mention that the powder is already crystalline, but the Xrd data shows a characteristic spectrum of amorphous hydroxyapatite. They are curious about the influence of crystal size during the XRD procedure and ask for clarification. The other person responds by explaining the relationship between crystal size and broadening effect of the Debye rings, and suggests using a large grained standard for correction. They also provide a book as a reference for more information.
  • #1
Msl
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Hello!

I would like to ask your help in the interpretation of Xrd data from hydroxyapatite nanopowder.
I know from the start that powders which I am analysing are already crystalline (another techniques were used to confirme that) but I keep having a characteristic spectrum of amorphous hydroxyapatite.
Why does this happen? What´s the influence of crystal size during in XRD procedure?

Thank you !
 
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  • #2
Hello,
A small crystal size will induce a broadening effect of the Debye rings. This relationship is discribed by:

B=0.9[tex]\lambda[/tex]/tcos([tex]\theta[/tex])

B = broadening of diffraction line measure at FWHM
t = crystal size diameter

B is the broadening of the peak due to grain size alone, therefore you must correct for the specific machine, do this using a large grained standard (of the same material).

B2 = BM2 - Bs2
Where BM is the measured breadth of the diffraction line and Bs is the measured breadth of the of the standard line.

I hope this helps, all this info can be found with much better explanation in:

Elements of X-Ray Diffraction, 2nd Edition, B.D. Cullity
 
  • #3


Hello,

Thank you for reaching out for assistance with your XRD data. It is not uncommon to observe an amorphous spectrum from crystalline samples when using XRD analysis. This can happen due to several reasons such as preferred orientation, sample preparation, or instrument calibration.

One possible explanation for your results could be the size of the crystals in your hydroxyapatite nanopowder. XRD analysis is sensitive to crystal size, with smaller crystals producing broader peaks and potentially overlapping with the amorphous background. This can make it difficult to distinguish between the two in your spectrum.

To confirm the presence of crystallinity in your sample, you may want to consider using additional techniques such as scanning electron microscopy (SEM) or transmission electron microscopy (TEM) to directly observe the crystal structure and size.

Additionally, it is important to ensure that your sample preparation is appropriate for XRD analysis. This includes grinding the powder to a fine, homogenous consistency and ensuring that the sample is well-packed in the instrument's sample holder.

I hope this helps in your interpretation of the XRD data for your hydroxyapatite nanopowder. If you have any further questions, please do not hesitate to ask. Best of luck with your research!
 

1. What is XRD nano-hydroxyapatite?

XRD nano-hydroxyapatite is a type of hydroxyapatite material that has been characterized using X-ray diffraction (XRD) techniques. It is a synthetic form of the mineral hydroxyapatite, which is the main component of human bone and teeth.

2. What are the properties of XRD nano-hydroxyapatite?

XRD nano-hydroxyapatite has unique properties that make it useful for various applications. It has a high surface area, good biocompatibility, and excellent bioactivity. It is also highly stable and resistant to corrosion.

3. How is XRD nano-hydroxyapatite synthesized?

XRD nano-hydroxyapatite can be synthesized through various methods, including wet chemical precipitation, sol-gel synthesis, and hydrothermal synthesis. These methods involve mixing specific chemicals and subjecting them to controlled conditions to form the desired nano-hydroxyapatite material.

4. What are the applications of XRD nano-hydroxyapatite?

XRD nano-hydroxyapatite has a wide range of applications in the medical, dental, and pharmaceutical industries. It is commonly used in bone grafts, dental implants, drug delivery systems, and tissue engineering scaffolds. It is also being researched for its potential use in cancer treatment and water purification.

5. What are the advantages of using XRD nano-hydroxyapatite over other materials?

XRD nano-hydroxyapatite offers several advantages over other materials. Its similarity to human bone and teeth makes it highly biocompatible, reducing the risk of rejection or adverse reactions. It also has a porous structure, which allows for better integration with surrounding tissues. Additionally, its high surface area and bioactivity promote faster healing and regeneration processes.

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