en گروه سرامیک Ceramic Materials and Engineering Research Paper Research Paper <span style="font-size:11pt"><span style="line-height:normal"><span style="font-family:Aptos,sans-serif"><i><span style="font-size:9.0pt"><span new="" roman="" style="font-family:" times="">This research systematically examines the structural, electrical, and optical characteristics of Tamarind Seed Polysaccharide (TSP)--based biopolymer electrolytes that are doped with varying concentrations of sodium iodide (NaI). Composite films were synthesized using the solution cast technique in weight percent ratios of TSP: NaI (100:0, 90:10, 80:20, 70:30) and subsequently characterized employing X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), UV&ndash;Vis spectroscopy, and impedance analysis. The XRD analysis indicated that the 80:20 composition displayed the highest degree of amorphousness, which is associated with improved ionic conductivity and reduced crystallite size. The FTIR analysis corroborated the occurrence of complexation between TSP and NaI, while the temperature-dependent conductivity measurements conformed to Arrhenius behaviour, with the 80:20 film achieving the ionic conductivity (<span style="color:black">1.97x10⁻⁴S/cm</span>) and the lowest activation energy (0.69 eV). Optical absorption investigations revealed a decrease in the bandgap from 3.92 (pure TSP) to 2.68 eV (80:20 film). Minimum optical energy bandgaps were achieved for the optimized film. Opto-dielectric investigations further demonstrated that the 80:20 formulation exhibited optimal dielectric permittivity and loss. The results underscore the potential applicability of TSP&ndash;NaI biopolymer systems as sustainable, high-performance polymer electrolytes.</span></span></i></span></span></span><br> &nbsp; TSP,sodium iodide (NaI),Arrhenius relation,tangent loss,and optical dielectric loss 119 131 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-5856-1&slc_lang=en&sid=1 Krishna Jyothi N jyothinadella82@gmail.com 1800319475328460021936 1800319475328460021936 Yes Sri Sathya Sai University for Human Excellence Keerthi M. Keerthychowdhury143@gmail.com 1800319475328460021937 1800319475328460021937 No Koneru Lakshmaiah Education Foundation Gnana Kiran M. gnanakiran33@gmail.com 1800319475328460021938 1800319475328460021938 No Koneru Lakshmaiah Education Foundation Venkata Kamesh Vinjamuri kameshvv@gmail.com 1800319475328460021939 1800319475328460021939 No Aditya University Prakash Babu Kanakavalli prakashk@vrsiddhartha.ac.in 1800319475328460021940 1800319475328460021940 No Velagapudi Ramakrishna Siddhartha Engineering college,Deemed to be university, Krupakaran R.L krupakaran1305@gmail.com 1800319475328460021941 1800319475328460021941 No Mohan Babu University Nandini P.S.V. 2301540007@kluniversity.in 1800319475328460021942 1800319475328460021942 No Koneru Lakshmaiah Education Foundation Rao M.C. raomc72@gmail.com 1800319475328460021943 1800319475328460021943 No Andhra Loyola College D. Madhavi Latha madhavilatha25@gmail.com 1800319475328460021944 1800319475328460021944 No Kakatiya Institute of Technology and Science Mahamuda SK. mahamuda.ss@kluniversity.in 1800319475328460021945 1800319475328460021945 No Koneru Lakshmaiah Education Foundation,