4 papers · 1 filter
Giant dielectric permittivity in Nb-doped rutile crystals
D. Nuzhnyy, V. Bovtun, J. Petzelt +13
Dielectric properties of Nb-doped (~1.5 at%) rutile single crystals were studied in the 10-300 K temperature range (at frequencies below the MHz range down to 0.3 K) in a broad fre…
High-Frequency and Microwave Magnetic Properties of NiZnFeO Spinel Ferrite Ceramics
M. Kempa, V. Bovtun, V. Kukhar +5
Magnetic properties of the NiZnFeO (NZF) spinel ferrite ceramics were studied over a broad frequency range (1 MHz - 50 GHz). Between 10 MHz and 2 GHz, stron…
Two Displacive Ferroelectric Phase Transitions in Multiferroic Quadruple Perovskite
A. Maia, M. Kempa, V. Bovtun +6
We report on the microwave, terahertz (THz), infrared and Raman spectroscopic studies of ceramics, shedding more light into the nature of two structural phase tran…
Microwave magnetic excitations in U-type hexaferrite SrCoZnFeO ceramics
M. Kempa, V. Bovtun, D. Repček +3
Microwave (MW) transmission, absorption, and reflection loss spectra of the ferrimagnetic U-type hexaferrite SrCoZnFeO ceramics were studied from 100 MHz to 35 GH…