Linear and nonlinear optical properties of trigonal borate crystals K7MIn2-xYbx(B5O10)3 (M = Ca, Sr, Ba; x=0…2) with isolated B5O10 units

Noncentrosymmetric borates K7MIn2−xYbx(B5O10)3 (M = Ca, Sr, Ba; x = 0…2) were synthesized by the solid state reaction and the crystals were successfully grown by the top seeded solution growth method using the K2O-B2O3-MF2 flux. According to Rietveld refinement, the crystal structure belongs to the noncentrosymmetric R32 space group. Also, the octahedrally coordinated In atoms are located at wide ranges ∼8 Å which may be promising for phosphor and laser applications. Samples with ytterbium show a characteristic emission band in the range of 950–1050 nm related to the 2F5/2 → 2F7/2 transition of Yb3+ ions that is commonly used for laser generation. IR, Raman and absorption spectra were obtained for the samples as well. The short cut edge of UV absorption, SHG intensity comparable with KDP and low concentration quenching of luminescence suggest that the K7MIn2−xYbx(B5O10)3 borates are promising self-frequency doubling materials

Synthesis and growth of rare earth borates NaSrR(BO3)2 (R = Ho− Lu, Y, Sc)

NaSrR(BO3)2(R = Ho-Lu, Y, Sc) compounds were obtained for the first time. Their structures exhibit disordered positions of Sr2+and Na+ atoms while RO6polyhedra are connected through the BO3 groups. Large distances between R atoms and high transparency in the range of 250-900 nm make them promising for phosphor applications. A pathway to obtain single crystals was shown by growing NaSrY(BO3)2and NaSrYb-(BO3)2by the top seeded solution growth method with Na2O-B2O3-NaFflux

Synthesis of New Isostructural Orthoborates NaBaR(BO3)2 with R = Tb, Dy, Ho, Er, Tm and Lu

Six new rare-earth orthoborates NaBaR(BO3)2, with R = Tb, Dy, Ho, Er, Tm, Lu were synthesized using a multiple-step solid-state reaction. These new orthoborates continue the previously described isostructural lines of three-cation orthoborates NaBaR(BO3)2, by R = Sc, Y, Yb. The structure of synthesized solid compounds is isotypic with the mineral eitelite, Na2Mg(CO3)2, crystallizing in the trigonal system with space group R3. All prepared borates are isostructural, as evidenced by the presence of the same vibration modes in Raman spectra and of the same diffraction peaks in X-ray patterns. The photoluminescence of NaBaTb(BO3)2 have been investigated in a detail

Синтез нового сложного бората KBaSm(BO3)2

Методом твердофазного двухстадийного синтеза получено новое соединение сложного трехкатионного щелочно-, елочноземельно-, редкоземельного ортобората KBaSm(BO3)2. Сравнительные результаты рентгенофазового анализа (РФА) и ИК-Фурье спектроскопии показали, что данное соединение изоструктурно известным соединениям KBaY(BO3)2 [1] и KBaTbB2O6 [2] и относится к тригональной сингонии (пространственная группа RǮm, с параметрами элементарной ячейки кристаллической решетки а=5,4845(10) Å, с=18,135(13), Z=3). KBaSm(BO3)2 получен при температуре 825°С из исходных реактивов: оксида (III) самария, карбонатов бария и калия и борной кислоты. В ряду KBaSm(BO3)2 – KBaTb(BO3)2 – KBaY(BO3)2 наблюдается закономерное линейное изменение параметров элементарной ячейки, а также регулярное смещение полос на ИК спектрах в зависимости от размера редкоземельного катиона

Study of an SmBO3–ScBO3 system and new SmSc(BO3)2 orthoborate

A new SmSc(BO3)2 compound was discovered from the study of SmBO3–ScBO3 by solid-state synthesis. The obtained compound was grown from a stoichiometric melt by a spontaneous crystallization method, and crystallizes in the space group R3¯ with the cell parameters of a = 4.8951(6) Å and c = 16.3012(2) Å. In addition, phase equilibria in this system in the 900–1300 °C temperature range were studied by X-ray diffraction and thermal analyses, as well as special diffusion experiments

Polymorphism in SmSc3(BO3)4: Crystal structure, luminescent and SHG properties

Low temperature C2/c and high temperature P321 modifications of SmxSc4-x (BO3)4 solid solutions were grown from LiBO2eLiF flux. These borates have typical luminescence for Sm3þ containing crystals with the two strongest peaks at 602 and 645 nm, which correspond to 4G5∕2 / 6H7∕2, 6H5∕2 electron transitions. In addition, the compounds were characterized by IR and Raman spectroscopy. SHG intensity for trigonal modification was found to be three times higher than that of KDP revealing its high potential for various NLO applications