Heat Capacity and Thermal Expansion of Yttrium Tantalate

Thermal expansion and heat capacities of holmium and erbium orthotantalates ceramics

“…The crystal lattice parameters a, b, c, β, and the unit cell volume V are presented in the form of polynomes, the coefficients of which are given in Table 2. The temperature dependences of the crystal lattice parameters did not contain anomalies associated with structural phase transitions, which was also confirmed by DSC measurements of the heat capacity in the range of 320-1700 K. Temperature dependences of unit cell volumes Morthotantalates: 1 -holmium, 2 -erbium, 3 -dysprosium, 29 4 -neodymium, 30 and 5 -yttrium 31 are shown in Figure 1. One can see, the temperature dependence curves are almost parallel.…”

Phase-sensitive radioluminescence and photoluminescence features in Tm3+-doped yttrium tantalates for cyan and white light generation

“…[27][28][29] Among other remarkable properties, these systems stand out for their low cutoff phonon energy (∼820 cm −1 ), which reduces non-radiative losses and boosts luminescence efficiency, and they display a high refractive index and solubilize lanthanide ions, enabling their largescale application in photonics. 23,[30][31][32] Furthermore, yttrium tantalates are considered to be outstanding scintillators due to their high density (7.68 g cm −3 ), high effective atomic number (Z eff = 60), non-hygroscopicity, rapid decay time about 2 ps, 33 and a scintillating efficiency that reaches about 20%, 34 however, the scintillation features of rare-earth tantalates have not been studied systematically.…”