# Physical properties of niobium pentoxide ($\mathrm{Nb}_2\mathrm{O}_5$) for thermal simulation

I am looking all day long for heat capacity, thermal conduction, and expansion coefficient of niobium-pentoxide. I want to conduct a thermal (heat flow) analysis on this and need it as input data. Can anyone provide the data or give references where to find it?

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Heat capacity of $Nb_2O_5$ from NIST's database, for a wide range of temperatures using Shomate equations.

But thermal conductivity and thermal expansion coefficient will be very hard to find.

• @Eisbär: I suggest to try and find thermal conductivity and thermal expansion coefficient for a compound that is similar to $Nb_2O_5$ and use these values in your modelling. Please upvote if you liked the answer. Ta. – Gert Sep 25 '15 at 13:25
• That was a good advice. Ta2O5 seems pretty similar. For this one can find values. I'm going to use those. – Eisbär Sep 25 '15 at 20:25
• @Eisbär: excellent. – Gert Sep 25 '15 at 20:48

Another possible source of data:

Thin films and nanostructures of niobium pentoxide: fundamental properties, synthesis methods and applications

Abstract:

As one of the transition metal oxides, niobium pentoxide (Nb2O5) offers a broad variety of properties that make it a potentially useful and highly applicable material in many different areas. In comparison to many other transition metal oxides, Nb2O5 has received relatively little attention, which presents a significant opportunity for future investigations aimed at fundamentally understanding this material and finding new and interesting applications for it. In this article, a general overview of Nb2O5 is presented which focuses on its fundamental properties, synthesis methods and recent applications, along with a discussion on future research directions relevant to this material.

This suggests that the article may contain references that will further help. I was not able to access it without paying - but maybe your institution's library can help you.

• Thanks. Good idea. I can check at the university it seems to have online access to the journal. – Eisbär Sep 25 '15 at 18:25
• In this book:**Thermal Conductivity: Theory, Properties, and Applications** there is a chapter on thin films where thermal conductivities are stated. – Eisbär Sep 25 '15 at 20:25

So for anyone looking for the answer in future. I will use this values:

k=0.3 W/m/K (thin film value from Ta2O5) Cp=600J/kg/K (taken from NIST thanks Floris) roh=4500kg/m^3 TEC=5*10^-6 (thermal expansion coefficient of Ta2O5)

In https://hal.archives-ouvertes.fr/hal-00587621/document , the value for the thermal conductivity of Nb2O5 is 1 W/mK.

Comparing to the thermal conductivity of TaO (http://aip.scitation.org/doi/abs/10.1063/1.4926921) the values are nearly the same.

Look at this publication - there are temperature-dependent thermal conductivity values for Nb2O5 (niobiumpentoxide): https://www.mdpi.com/1996-1073/12/4/610