Synthesis, crystal structure and characterizations of a new red phosphor K 3 EuB 6 O 12

Structural and spectroscopic properties of new noncentrosymmetric self-activated borate Rb3EuB6O12 with B5O10 units

“…Under the selected technological conditions, synthesis resulted in the agglomerates 5-20 m in size formed by strongly coalescent individual grains with diameter below 1 m. This micromorphology is common in oxides when temperature/time conditions used for the solid state reaction are high enough for the active grain interdiffusion [16,34,37,43,44]. It should be pointed that the Rb3EuB6O12 particles possessed strong charging effect during SEM measurements and this verifies their very low conductivity common for the oxides without oxygen vacancies.…”

“…The dependence of unit cell volume on the element combination in M3REB6O12 (M = alkaline metals; RE = Y, rare earth metals) crystal family is shown in Fig. 3 [33][34][35][36][37]39]. It should be noted that all compounds besides K3TbB6O12 have space group R32 and similar cell parameters.…”

“…The K3(Tb, Lu, Eu)B6O12 compounds have R32 space group which is non-standard and, moreover, cell parameter c is two times smaller in comparison with other compounds [34][35][36].…”

“…However, within M2O-RE2O3-B2O3 (M = alkali metal, RE = rare earth) systems, only several NCS crystalline media have been found up to date, namely Na3La2(BO3)3 [30], Rb3Y2B3O9 [31] Na3La9O3(BO3)8 [32], K3REB6O12 (RE = Y, Eu, Tb, Lu) [33][34][35][36] and Rb3NdB6O12 [37]. It is worth noting that K3REB6O12 (RE = Y, Eu, Tb, Lu) and Rb3NdB6O12 are related to the same structure type, and they crystallize in the trigonal space group R32 and exhibit noticeable SHG signal.…”

Exploration of structural, thermal and spectroscopic properties of self-activated sulfate Eu2(SO4)3 with isolated SO4 groups

“…For this reason, in complex compounds, it is difficult to define clearly the relation between the spectroscopic parameters and the Eu 3+ ion coordination in the host lattice. In this situation, the europium compounds, where Eu 3+ is a constituent element, are more suitable for this purpose because the Eu 3+ ion coordination can be precisely defined by the methods of modern crystal structure analysis [27][28][29][30][31][32][33][34]. Thus, the present study is aimed at the synthesis of anhydrous Eu2(SO4)3 and evaluation of their structural and optical properties.…”