Comprehensive study of chemical synthesis and dielectric parameters of holmium substituted Yttrium iron garnets (HoxY3-xFe5O12, x=0.1,0.3,0.6,0.9,1.2,1.5) prepared by conventional ceramic method | Kausar Javed Khan | Lahore College for Women University, Pakistan |

Kausar Javed Khan

Lahore College for Women University, Pakistan

Title: Comprehensive study of chemical synthesis and dielectric parameters of holmium substituted Yttrium iron garnets (Ho_xY_3-xFe₅O₁₂, x=0.1,0.3,0.6,0.9,1.2,1.5) prepared by conventional ceramic method

Biography

Abstract

YIG (Yttrium Iron Garnet) is magnetic ferrite having chemical formula Y₃Fe₅O₁₂ and high resistivity. Substituted YIGs have formula Re_xY_3-x Fe₅O₁₂, where R represents rare earth elements. Polycrystalline cylindrical (13 mm x 3.3 mm) six samples of Holmium substituted YIG (Ho_xY_3-xFe₅O₁₂) were prepared by Conventional Ceramic Technique. Powder samples were annealed at 1000â—¦C (1hour) and these were called green powders. The crystalline structure and dielectric properties of samples were studied by D8 Discover X-Ray Diffractometer and Wayne Kerr Impedance Analyzer. Microstructural properties like crystallite size, dislocation density, micro-strain were calculated using XRD data. Dielectric parameters were studied with reference to changing Holmium composition and changing frequency comprehensively. Both dielectric constant (Æ’) and Dielectric Loss (Æ’’ ) decreased sharply with the increase of frequency at Room Temperature (300k).The decreasing trend in Dielectric Parameters was observed with the increase in Holmium contents . This series of Substituted YIG having small dielectric constant, low dielectric Loss and negligible Tangent Loss can play the most vital role in many electronic devices in microwave region. Small dielectric parameters exhibited by these prepared magnetic garnets make them highly useful in telecommunication and defense industry.