Depends on the percentage composition of Si, C and N in your sample. Read this paper: dx.doi.org/10.1016/S0925-9635(02)00143-7

Thank you very much for your suggestion.

Two points to mention are:

[i]The exact values of C-N stretching vibrations in Si-C-N, C-N-C, and C-N=C groups for silicon carbonitride thin film are not reported in the literature.But the strong,distinct absorption peak at 2200 cm-1 has been assigned to the -N≡C-bond which includes components like –C-N≡ C- and -C=N=N-. In addition, a broad band at 1520 cm-1 is observed between 530 and 1750 cm-1 .

Reference:

Diamond and Related Materials 11 (2002) 16 - 21.

[ii] Of course, the above named components can be best located from their binding energies values which can be investigated by X-ray photoelectron spectroscopy (XPS) and should be used for their authenticity:

Two points to mention are:

[i]The exact values of C-N stretching vibrations in Si-C-N, C-N-C, and C-N=C groups for silicon carbonitride thin film are not reported in the literature.But the strong,distinct absorption peak at 2200 cm-1 has been assigned to the -N≡C-bond which includes components such as –C-N≡ C- and -C=N=N-. In addition, a broad

absorption band at 1520 cm-1 is observed between 530 and 1750 cm-1 .

Reference:

Diamond and Related Materials 11 (2002) 16 - 21.

[ii] Of course, the above named components can be best located from their binding energies values which are investigated by means of X-ray photoelectron spectroscopy (XPS) and should be used for their authenticity:

Dear Prof. Sehgal,

Thank you sir for shearing the valuable information. I have also searching the literatures for that, but i did not found the exact peak position. yes, xps measurement could be informative for exact peak position. but, at present i have no such facility. How much peak position will shifted in IR spectra, if Si or C or C=N is attached with C-N ? Is it more than 100cm-1? Please suggest me.

Hopefully, the following information will prove to be of some help where you may find ṿ(C≡N) values of some analogous compounds:

*(A)CH3CN(Acetonitrile)=2267cm-1[cf to -C-C≡N].

*(B)CH3NC(Methyl isonitrile)=2165cm-1[cf to -C-N≡C].

*(C) cyanogen (N≡C-C≡N)2355cm-1{cf to ≡C-C≡N}.

**( C )SiCN=2460cm-1[cf to Si- C≡N].

**(D)SiNC=2260cm-1[cf to Si-N≡C].

** See reference:

[2003

Isomerization of the Newly Discovered Interstellar

Molecule SiCN to SiNC Through Two Transition

States

Nancy A. Richardson

Liberty University, [email protected]]

*All these values are available in the IR tables.

Thank you sir, I am trying to assign the peaks.