Dear Everyone,
Recently, I found a new method to prepare one phase of MnO2 from post-treatment of an mixed oxide. In my XRD pattern, there is clearly single phase epsilon-MnO2, which matches quite well with the JCPDS Card No. 30-0820. However, in the HRTEM, no any distance of crystal lattice could be found. I have tried many Equipment to do the same characterization. However, I found that almost all distance of lattice indicate a 2.78 A, which can not match any d-value of epsilon-MnO2. Have you ever found any similar phenomena in your science career? Can you give me some useful advice for further confirm this?
Thank you.
Hi, long:
The g list is shown in the attached file, and the half of your measured value can be found in the list. The problem seems clear. It is due to the resolution of your TEM, please ask your technician about the resolution about the TEM. BTW, when you ask question in next time, please show your HRTEM image and crystal structure in CIF, since I think not everyone can access the JCPDS card.
Good luck
Xinfu
I think that you are mixing up lattice parameters with d-spacings. The 2.78A is the dimension of a and b in the lattice of your MnO. The diffractogram is giving you a series of d-spacings, which if you can index with the correct space group then you can discover the lattice spacing from that.
Dear Yuan,
Could you show your HRTEM image, please? I think it will make the question much more clear. Sorry, I am confused about the meaning of "distance of lattice". Do you mean "d-spacing" or anything else?
Dear Liya,
Thank you for the kind help. I uploaded a dm3 format HRTEM of our epsilon-MnO2. I do mean "d-spacing" here. It seems that the as-mentioned 2.78 A is the double spacing of 1.39 A in [110] direction (c.a. 67 o). However, the crossed spacing (c.a. 2.5 A) have not yet been confirmed. Could you give me some advice to fix this?
Thanks again.
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