Electromagnetic and Microwave Absorption Behavior of Strontium Calcium Manganite in the 8–12 GHz Frequency Spectrum

Abstract

Cost effective co-precipitation method is used to synthesize strontium calcium manganite with nitrate precursors. The X-ray diffraction studies and defect analysis by first principle calculation shows that due to increase in calcium concentration monoclinic to orthorhombic phase change occurs. The microwave properties are studied using voltage standing wave ratio (VSWR) and waveguide reflectometer method. In the high frequency (8–12 GHz) range, the microwave properties (permittivity, permeability, and absorbance) of strontium calcium manganite depend on concentration of calcium. At 9 GHz frequency (Sr_1–xCa_x) MnO₃ (0.0 ≤ x ≤ 1.0) shows about 80% absorption.

Keywords:

• co-precipitation
• manganite
• permittivity
• permeability

Acknowledgments

Dr. Puri would like to thank UGC India for Award of Research Scientist ‘C’. Ms. Pawar acknowledges DST PURSE for research assistant. Dr. Pawar would like to thank Mr. Rajendrakumar Mane (J. B. Patil High School Chipari) and Mr. D. P. Nade Department of Physics, Shivaji University, Kolhapur, for valuable discussions and suggestions. Ms. Pawar and Dr. Puri also thank DST-FIST, UGC-SAP.