JPPIPA 9(1) (2023) Jurnal Penelitian Pendidikan IPA Journal of Research in Science Education http://jppipa.unram.ac.id/index.php/jppipa/index ___________ How to Cite: Susilawati, Doyan, A., Al-Qoyyim, T. M., Ap’aludin, Maemum, P. J., Ristanti, C. I., & Ariani, B. I. (2023). Synthesis of Barium M-Hexaferrite Using Co-precipitation Method with Zn Doping Based on Natural Iron Sand at Tebing Beach, North Lombok as Microwave Absorbent Material. Jurnal Penelitian Pendidikan IPA, 9(1), 498-503. https://doi.org/10.29303/jppipa.v9i1.2935 Synthesis of Barium M-Hexaferrite Using Co-precipitation Method with Zn Doping Based on Natural Iron Sand at Tebing Beach, North Lombok as Microwave Absorbent Material Susilawati 1,2* , Aris Doyan 1,2 , Thufail Mujaddid Al-Qoyyim 1 , Ap’aludin 1 , Putri Julia Maemum 1 , Chorina Ika Ristanti 1 , Baiq Istira Ariani 3 1 Physics Education, Faculty of Teacher Training and Education, University of Mataram, Lombok, West Nusa Tenggara, Indonesia. 2 Master of Science Education, University of Mataram, Lombok, West Nusa Tenggara, Indonesia. 3 Chemistry Education, Faculty of Teacher Training and Education, University of Mataram, Lombok, West Nusa Tenggara, Indonesia. Received: November 26, 2022 Revised: January 24, 2023 Accepted: January 29, 2023 Published: January 31, 2023 Corresponding Author: Susilawati susilawatihambali@unram.ac.id © 2023 The Authors. This open access article is distributed under a (CC-BY License) DOI: 10.29303/jppipa.v9i1.2935 Abstract: This study aims to synthesize barium M-hexaferite using the coprecipitation method with Zn doping based on natural iron sand at the Tebing Beach of North Lombok as a microwave absorbent material. This study used 3 variations of doping concentration (x), namely x = 0.000; 0.400; and 0.800. In addition, variations in the calcination temperature were also carried out, namely 400°C and 1100°C. After the calcination stage, the sample is ground to obtain smaller or nano-sized particles. The results showed that the sample has a brick red color for a temperature of 400°C and black for a temperature of 1100°C. This shows that the higher the calcination temperature, the darker the color of the sample. Keywords: Barium M-hexaferrite; Co-precipitation; Iron sand; Microwaves Introduction Indonesia is a country with abundant natural resources, one of which is natural iron sand (Susilawati et al., 2021). Iron sand is a source of natural magnetic material that can be obtained along the coastline (Elinda et al., 2022; Rahmawati et al., 2013; Susilawati et al., 2018). Lombok Island has a coastline of 2,333 km, this certainly makes Lombok Island's iron sand a potential for development, one of which is at the Tebing Beach of North Lombok (Susilawati et al., 2018). Iron sand has the main components of iron oxide (Fe2O3) and silica (SiO2) (Rahmi et al., 2019) and contains magnetic minerals such as magnetite (Fe3O4) and hematite (a-Fe2O3) (Fatari et al., 2022). Applicatively, natural iron sand can be used as Radar Absorbing Material (RAM) (Fatimah et al., 2022). RAM is a microwave absorbing material. The waves on the RADAR (Radio Detection and Ranging) tool use microwaves because they have a super high frequency. RAM is generally applied to the field of defense and state security. More specifically, RAM can be applied to anti-radar aircraft or submarines so that they cannot be detected by enemy radar (Susilawati et al., 2021). The material being developed as a microwave absorber is Barium M-Hexaferite (BaM) (Susilawati et al., 2018). BaM is a complex oxide ceramic with the chemical formula BaFe12O19. BaM is included in ferromagnetic oxide materials with dielectric and magnetic properties which are widely used in radio frequency and microwave applications. Theoretically, BaM has characteristics that qualify as an absorber, namely having large crystalline anisotropy, high coercivity (6700 Oe = 0.67 Tesla), relatively high Currie temperature (450 o C), relatively large magnetic saturation (Ms = 78 emu /gram), good chemical stability and resistance to corrosion (Simbolon et al., 2013), and has a very high melting temperature of 1390°C (Pullar et