Dielectric and magnetic properties of holmium and ytterbium titanates

Abstract

Ytterbium and holmium titanates have been synthesized and their dielectric and magnetic properties have been investigated. The frequency dependences of the permittivity at T = 77 and 300 K, and measured magnetization curves and temperature dependences of the magnetic susceptibility in fields up to 30 kOe and at temperatures from 2 K to 50 K have been obtained. The properties of the doped and undoped titanates have been compared. Based on the temperature dependences of the magnetic susceptibility, the magnetic dipole and exchange couplings in the titanates have been analyzed.

Structural Distortion-Modulated Magnetic and Dielectric Properties in Nonstoichiometric Yb2–xTi2O7−δ Pyrochlore

“…First, the maximum dielectric constant (ε r,max ) decreases while the temperature ( T max ) corresponding to ε r,max increases with increasing frequency. This feature represents a typical dielectric relaxation nature, which is significantly different from the rarely reported dielectric behavior of the Yb 2 Ti 2 O 7 system . To identify the relaxor degree, the critical exponent γ is calculated based on the data collected at 10 4.5 Hz by using eq , and the results are shown in Figure c.…”

“…This feature represents a typical dielectric relaxation nature, which is significantly different from the rarely reported dielectric behavior of the Yb 2 Ti 2 O 7 system. 43 To identify the relaxor degree, the critical exponent γ is calculated based on the data collected at 10 4.5 Hz by using eq 2, and the results are shown in Figure 7c. In particular, the γ is 1.27 for x = 0 while it is 1.94 for x = 0.10.…”