when I studied raman spectroscopy(using 532nm laser) of a NdNiO3 thin film( LaAlO3 ,NdGaO3,SrTiO3 substrate) then fine peak is appeared in every cases but when I used Bulk powder polycrystalline NdNiO3 sample then no peak is appeared,only flat spectra is cominng.Can anyone tell me what is the reason behind that ???

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