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.
Another possible source of data:
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.
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