Growth, structural and thermophysical properties of TbNbO₄ crystals

Abstract

An as-grown TbNbO4 crystal has a negative thermal expansion and the zero thermal expansion could be achieved.

Czochralski Growth and Characterization of a Novel Nonlinear Optical Crystal Te2P2O9

“…The thermal properties such as thermal expansion, specific heat, thermal diffusivity, and thermal conductivity have an important influence on the growth and application of crystals. − For example, a large anisotropic thermal expansion will increase the possibility of crystal cracking during growth and processing, , whereas a large specific heat means the crystal has a higher laser damage threshold . High thermal diffusion and heat conductivity can make the heat generated in use easily transferable to the environment, thereby increasing service life of the crystal. ,, …”

X‐ray photoelectron spectroscopy study of neodymium niobate and tantalate precursors and thin films

“…The binding energy differences Δ(O―Nb) = B E (O 1s) − B E (Nb 3d 5/2 ) and Δ(O―Ta) = B E (O 1s) − B E (Ta 4f 7/2 ) were used as a suitable parameter to characterize average Nb―O bonding (322.9 eV) in NNO and Ta―O bonding in NTO (504.2 eV) . The same binding energy levels of Nb 3d 5/2 (206.7 eV) and Nb 3d 3/2 (209.4 eV) were found in TbNbO 4 and in the case of Ta 4f at 27.9 eV (4f 5/2 ) and 26.0 eV (4f 7/2 ) in YTaO 4 . The Ta peak has a contribution coming from Ta in Ta 2 O 5 at peak positions 27.9 eV (4f 5/2 ) and 26.0 eV (4f 7/2 ) in LaTaO 4 .…”

Tuning Green to Red Color in Erbium Niobate Micro- and Nanoparticles

“…Rare-earth (RE) niobates, such as orthoniobates RENbO4, are expected to have interesting luminescence properties related to the lanthanide elements in their lattice [1][2][3][4]. By changing the RE ion in the niobate host, it is possible to change and even control the spectral range of the emission, resulting in tunable phosphors for photonic and optoelectronic applications [1]. As such, RENbO4 have been recognized as efficient luminescent materials [1,2].…”

“…By changing the RE ion in the niobate host, it is possible to change and even control the spectral range of the emission, resulting in tunable phosphors for photonic and optoelectronic applications [1]. As such, RENbO4 have been recognized as efficient luminescent materials [1,2]. Indeed, these materials exhibit low phonon cut-off energies, which make them suitable for optical applications, as the transition probability of the intra-4f n is enhanced in such case, also presenting long emission lifetimes [2,5].…”

“…Indeed, these materials exhibit low phonon cut-off energies, which make them suitable for optical applications, as the transition probability of the intra-4f n is enhanced in such case, also presenting long emission lifetimes [2,5]. Several RE ions have been employed in the formation of RE niobate materials (RE = La, Ce, Pr, Nd, Sm, Eu, Dy, Ho, and Er) [1,3,[6][7][8][9][10] and their luminescence properties have been widely investigated. Among those, erbium niobates possess interesting properties for optical applications owing to the trivalent Er ion (Er 3+ ) characteristics [11,12].…”