According to the attached Abstract, in nanocrystalline undoped CeO2, decreasing the grain size results in an increase in the electrical conductivity, which was attributed to an increase in both carrier density and mobility because of larger surface/volume fraction in finer grain specimens.

One of the authors of this paper is on the RG network. Why not contact him directly.

https://www.researchgate.net/profile/Larry_Pederson3

Regarding the absolute values of conductivity, check this paper.

Here is an interesting paper on ionic conductivity of CeO2 nanowires.

actually, we have made very successful story on non-doping CeO2, but I cannnot release here because we are writiing paper. Anyway, I can tell you existing knowledge and publications cannot explain what we achieved. I would like to hear from you exact CeO2 codnuctivity, of course, pelase note it is electronic or ionic, in which atmoshpere, reduced or oxidized, which nano morphology and what temperature. Whatever you can find from literature, I can add one order of managnitude for enhanced ionic conductivity for you, we succeeded in this.

Dear Sergei Sergeenkov · sir and Bin Zhu sir,

Thank you very much for adding answer.  The papers uploaded by Sergei sir very much helpful.

Dear Bin Sir,

I want both electrical and ionic conductivity, in ambient conditions for nanoparticles of crystalline size 10nm by xrd and mean particle size of 150nm by SEM. 

Sir, I request to please do add your valuable suggestions and comments.

Thank you sirs

Suhail

you have to determine separately electronic and ionic conductivities.

yes sir i want to know their approximate values.

It depends on the size, but the non-stoichiometric ratio of +3/+4 cerium ions is more critical. As the more +3 ionization states of cerium will be corresponding to more O-vacancies in ceria, and consequently the conductivity of ceria is increased.

Thank you Nader Sir,

But i want to know exact value of electrical conductivity ceo2.

Thank you sir

regards

Suhail

it depends very much the morphology and defects on particles, what in our materials reached around 0.1 Scm-1 from fuel cell measurements, the true data

Thank you Bin Sir,

Can you send the reference for this.  I will cite in my paper.

Suhail, my team measured the conductivity of ceria but doped with erbium in reduction environment for formation of more O-vacancies. The conductivity was found to be σ=77 ×10^−6 S/cm. The reference is in the following link:

http://www.mdpi.com/1996-1944/8/11/5399/htm

I am sure if you check references and if you do by your own research, you will get very much different results.

Thank you Bin sir for adding helpful answers.

Thank you Nader Sir for adding helpful reference.

Y.M. Chiang, E.B. Lavik, I. Kosacki, H.L. Tuller, J.Y. Ying, J.

Electroceram. 1 (1997) 7.

and

T. Suzuki, I. Kosacki, H. Anderson, J. Am. Ceram. Soc. 84

(2001) 2007.

nanosized CeO2 in which the electronic conductivity

was enhanced by approximately four orders of magnitude

when compared to single or microcrystalline

CeO2

Thank you Bin sir for adding helpful references.