Degree of inversion of A/B lattice sites and microwave/millimeter wave/terahertz dielectric properties of MgAl2-x(Zn0.5Mn0.5)xO4 ceramics. Issue 8 (July 2023)

• Record Type: Journal Article
• Authors: Shi, Rengang; Zhu, Shengkai; Muhammad, Raz; Zhou, Tao; Liu, Bing; Mao, Minmin; Wang, Dawei; Song, Kaixin
• Is Part Of: Journal of the European Ceramic Society. Volume 43:Issue 8(2023)
• Page Start: 3324
• Page End: 3330
• Publication Date: 2023-07
• Subjects: MgAl2O4 -- 5G/6G -- Microwave dielectric ceramic -- Infrared reflectance spectrum -- Terahertz time-domain spectroscopy; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2023.01.020
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: In this work, spinel-structured MgAl2- x (Zn0.5 Mn0.5 ) x O4 (0 ≤ x ≤ 0.08) single-phase ceramics were prepared through a solid-state reaction route. The substitution of (Zn0.5 Mn0.5 ) 3+ for Al 3+ at the octahedral site affected the degree of inversion of A/B lattice sites, bond length/strength/valence, and covalency of metal-oxygen bond in the tetrahedron and hence microwave dielectric properties of MgAl2 O4 . The variation in ε r and tanδ of ceramics is investigated in the millimeter wave-terahertz frequency band by combining infrared reflection spectrum and terahertz time-domain spectroscopy. A high Q × f value of 111, 010 GHz @ 12.01 GHz, low ε r = 8.3, and slightly lower τ f = −60 ppm/°C is obtained for MgAl1.98 Zn0.01 Mn0.01 O4 ceramics, which is tuned by adding a small amount of SrTiO3 . The composite ceramics exhibited a near-zero τ f (2.8 ppm/°C), high Q × f (55, 400 GHz @ 11.15 GHz), and low ε r (= 8.5), showing a great potential application prospect for 5G/6G wireless communication.