Effect of P-nitrophenol as dopant in ammonium tetroxalate dihydrate – Spectral, optical, thermal and dielectric analyses

•PNP doped ATOXAL was grown using SEST technique.•Good transparency in the visible region and a wider optical band gap.•Near Band to Deep Level Emission ratio indicates the sample’s high crystallinity.•Apt material for third harmonic generation.•Soft crystal exhibiting non-Debye β relaxation. Single...

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Bibliographic Details
Published in:Optics and laser technology 2019-04, Vol.111, p.734-743
Main Authors: Jerusha, Eunice, Shahil Kirupavathy, S., Vinitha, G., Shalini, S.
Format: Article
Language:English
Subjects:
Crystal growth
Cut off wavelength
Effects
Emission analysis
Luminescence
Mechanical properties
Microhardness
Nitrophenol
Parameter estimation
Photoconductivity
Photoluminescence
Refractivity
Single crystals
Specific heat
Thermodynamic properties
Triclinic crystals
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Summary:•PNP doped ATOXAL was grown using SEST technique.•Good transparency in the visible region and a wider optical band gap.•Near Band to Deep Level Emission ratio indicates the sample’s high crystallinity.•Apt material for third harmonic generation.•Soft crystal exhibiting non-Debye β relaxation. Single crystals of ammonium tetroxalate dihydrate doped with p-nitrophenol (PNP doped ATOXAL) were grown using the slow evaporation solution growth technique. The harvested crystals possessed the P1¯ space group and occupied the triclinic crystal system. From UV–vis-NIR spectrum the optical parameters like optical band gap (Eg), refractive index (n), electric susceptibility (χc) and real and imaginary parts of the dielectric constant were found to be 3.276 eV, 1.58, 0.199, 2.498 and 0.93 × 10−5 respectively at the lower cutoff wavelength. The refractive index value calculated using Abbe’s refractometer was 1.581. The crystal exhibited negative photoconductivity. The photoluminescent emission spectrum was recorded and studied. The mechanical properties have been studied using Vicker’s microhardness tester and the material belongs to the soft category. The thermal property of the crystal was analysed from the TGA/DTG/DSC curves. The dielectric studies carried out for varied frequencies and temperatures reveal that the material exhibits non-Debye β relaxation. Z-scan studies show that the grown crystal has negative nonlinearity and saturation absorption.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2018.09.009