I am using magnesium metal powder for tantalum pentoxide reduction, but why the % of Ta metal powder obtained to its pentoxide form is just 95% ?

Problems with anodization of tantalum with a copper layer underneath tantalum?

Dear fellow researchers, I am currently trying to build thin film tantalum pentoxide integrated capacitors. I use 8''/200mm silicon wafers with a 100nm thick silicon oxide layer. I sputtered...

25 February 2024 8,199 1 View

How does an one µm thick copper layer react in a pure SF6 plasma?

For my tantalum pentoxide thin film integrated capacitors, I need to etch the tantalum and tantalum pentoxide layers with pure SF6 plasma. While etching these layers copper will also be exposed to...

24 January 2024 638 1 View

Does anyone know what color etchants to use for metallographic preparation of Tantalum or similar refractory metals?

I have to occasionally etch tantalum to evaluate grain structure, but I often times find the etchant doesn't fully reveal the grain boundaries. Perhaps using a color etchant as well is worthwhile....

02 January 2024 8,652 0 View

Separation of tantalum layer superconductivity from the superconducting film deposited on MgO substrate with Tantalum layer (5nm) as seed layer.?

The film shows the superconducting transition temperature around 4.4K in the resistivity plot and ZFC/FC plot, which is similar to tantalum Tc. I performed ZFC/FC ZFC/FC measurement of...

02 November 2023 5,754 0 View

Is there any Tantalum alloy which can not oxidized at room temperature?

Normally tantalum has high affinity to react with oxygen and forms Ta2o5 . but we want to sputtered oxide free tantalum. is there any way to deposit oxide free tantalum or is there any Ta alloy...

03 July 2023 4,004 3 View

Why is platinum's LSV curve so noisy compared to other transition metals?

Electrolyte: molten potassium dihydrogen phosphate Working electrode: platinum, tungsten plate Counter electrode: Platinum plate Reference electrode: Ag/Ag3PO4 electrode The scanning voltage is...

19 June 2023 807 0 View

How to get optical constants of Tantalum for using as plasmonic material in PCF Sensor?

I have been working on PCF & Plasmonic Materials and for simulation I am using COMSOL Multiphysics. In my PCF design I am using Tantalum as plasmonic material. But the problem is how do I use...

31 March 2023 8,102 2 View

What is the proper way to make Tantalum penta chloride solution?

I have used Ethanol and potassium hydroxide to dissolve Tantalum. But it didn't work. Anyone have the idea , how could it be dissolved properly?

07 February 2023 1,093 0 View

What could be an alternative of Na(Hg)?

I am currently trying to make a low-valent tantalum(I) complexes. However, many reports utilized the reduction of tantalum(V) or (III) by sodium amalgam. I would avoid the use because of the...

30 January 2023 7,250 4 View

QUANTUM ESPRESSO ERROR - calculation "‘vc-relax’" not allowed. where is the error?

I'm trying to perform vc-relax for Tantalum in quantum espresso. here's my input file.I'm not finding where the error is - &CONTROL calculation=‘vc-relax’...

27 December 2021 7,173 4 View

Jean-Claude Grivel

Hi,

2% Fe in the final Ta? What is the purity of your starting compounds?

Do you use the same process as described in:

Production of Tantalum Powder by Magnesiothermic Reduction of Feed Preform December 2003MATERIALS TRANSACTIONS 44(12):2646-2653 DOI: 10.2320/matertrans.44.2646

It seems that they could avoid Fe contamination by limiting the physical contact between the Ta2O5 and the steel sample crucible.