Spectral Parameters of Nd^3＋ inthe Nd^3＋：GdMgB5O10 Crystal

1 INTRODUCTION With the development of diode-pumped solid-statelasers, the search of more efficient materials for diode-pumped solid-state lasers is becoming more and moreimportant. The good laser materials should have thefeatures of large absorption coefficient and large ab-sorption line widths, as well as large emission crosssection at the emission wavelength. In the past years,a number of Nd3 -doped crystals, such as Nd3 :YVO4 , Nd3 :YAG[2], Nd3 :KLW[3] and Nd3 : [1]YAP…     

Structure of Non-stoichiometric Sr6Gd0.61Sc1.39（BO3）6 Crystal

1 INTRODUCTION With the increasing interest in diode-pumped solid state lasers, researches on more efficient new materials for diode pumping become more important. The double borates are a type of excellent laser gain media, for example, Nd3 -doped RAl…     

Synthesis and Structure of Ba3La2（BO3）4 Crystal

1 INTRODUCTION At present the researches on more efficient solid-state laser materials become more important for the rapid development of diode-laser pumped solid-state laser. More researches have been devoted to the double borate compounds RX3(BO3)4 (R = Y, La, Gd and X = Y, Al, Sc), some of which exhibit good chemical and physical properties[1～10]. The rare earth and alkali-halide double borates M3Ln2(BO3)4 (M = Ca, Sr, Ba and Ln = LaLu and Y) were reported in literatures[11…     

Structure of High Temperature Phase α-Ba3Y（BO3）3 Crystal

1 INTRODUCTION To the present, the series of compounds M3Ln- (BO3)3 (M = Sr, Ba and Ln = La-Lu, Sc, Y) with space group P63cm or 3R have been reported[1～5]. Some of them exhibit interesting optical properties when doped into the active Cr3+ or Yb3+ ions as laser materials. For example, the Yb3+-doped Sr3Y- (BO3)3 crystal is a promising laser material for both tunable and femtosecond laser applications[6～8]. The Ba3Y(BO3)3 crystal melts congruently at 1256 ℃ and has a phase…     

Structure of Low Temperature Phase b-Ba_3Y(BO_3)_3 Crystal

1 INTRODUCTION Recently the series of compounds M3Ln(BO3)3 (M = Sr, Ba and Ln = LaLu, Sc, Y) with space group P63cm or -3R have been reported[1～5], and some of them exhibit interesting optical properties when doped with the active Cr3+ or Yb3+ ions as laser materials. For example, Yb3+-doped Sr3Y- (BO3)3 crystal is a promising laser material for both tunable and femtosecond laser applications[6～8]. The Ba3Y(BO3)3 crystal melts congruently at 1256 ℃ and has a phase transitio…     

Growth and Spectral Properties of Nd^3＋ Doped KLa（MoO4）2 Crystal

1 INTRODUCTION There has been an increasing interest in the re- search of diode-pumped solid-state lasers in recent years because of the rapid development of high power diode lasers. The absorption peak of Nd3 ions at about 800 nm corresponding to 4I9/2→ 2H9/2 tran- sition is suitable for commercial laser diode GaAlAs pumping[1]. KLa(MoO4)2 is a kind of disordered crystalline host for lasing rare-earth ions[2], and it belongs to Scheelite (CaWO4) structure[3]. The disorder derives…     

Spectral Parameters of Nd^3＋ Ion in Nd^3＋：KLu（WO4）2 Crystal

1 INTRODUCTION There has been increasing interest in the re-search of diode laser-pumped solid-state lasers in re-cent years because of the rapid development of highpower diode lasers. Nd:YAG and Nd:YVO crystalsare commercially available, but limited to low Nd3 (= 1 at.%) doping concentration and to narrow ab-sorption bands near the diode emission wavelengthof 808 nm. Therefore, it is necessary to explore moreefficient crystal materials for diode-pumped solid-state lasers. The alkali …     

Spectral Parameters of Nd^3＋ Ion in Nd^3＋：NaGd（MoO4）2 Crystal

1 INTRODUCTION Since the diode-laser pumped solid-state lasers were found in a wide variety of applications in the fields of military, industry, medical treatment and scientific researches due to the advantages of high stability, compactness, high efficiency and long life- time, the research on more efficient new materials with improved spectral properties for diode pumping has become more important. Molybdate crystals with general formula M’Re(MoO4)2 (M’ = Li, Na, K) have been repor…     

Crystal Structure of Lithium Yttrium Borate LiY6O5（BO3）3

1 INTRODUCTION In recent years, more and more attention has been paid to rare-earth borates due to their excellent pro- perties, such as YCa4O(BO3)3(YCOB)[1], YAl3(BO3)4 (YAB)[2] and La2CaB10O19[3] for nonlinear optical materials and self-frequency doubling materials as well as YBO3:Eu for red phosphor materials[4] and Li6M1-xCex(BO3)3 (M = Y, Gd) for neutron detec- tors[5]. In this work, we focus our research interest on LiY6O5(BO3)3 as hosts for VUV (vacuum ultraviolet) l…     

Growth and Characterization of γ—Nd^3＋：LaSc3（BO3）4Crystal

INTRODUCTIONLaser-diode(LD) pumped solid-state lasers have a variety of applications in the fields of military, industry, medical treatment and scientific researches due to the advantages of high stability, compactness, high efficiency and long lifetime, and this area has become one of the hot points in the laser field. As a result, research on new materials with improved spectral properties for diode pumping is of increasing interest again. A new high efficient diode-laser-pumped solid-s…     

Synthesis and Crystal Structure of a Novel Ternary Borate,NaSrB5O9

A novel ternary borate, sodium strontium pentaborate, NaSrB5O9, has been prepared by solid-state reaction below 800 ℃. The single-crystal X-ray structural analysis showed that NaSrB5O9 crystallizes in monoclinic, space group P21/c with a = 6.499(2), b = 13.979(3), c = 8.045(2) , β = 106.92(2)°, V = 699.2(3) 3, Z = 4, Mr = 308.66, Dc = 2.932 g/cm3, μ = 7.804 mm-1, F(000) = 584, R = 0.0264 and wR = 0.0621 for 2426 observed reflections and 146 variables. NaSrB5O9 is a layered compound containing double ring B5O11 building units composed of two BO4 tetrahedra and three BO3 triangles. Each B5O11 unit is connected to four other equivalent units through exocyclic oxygen atoms to form a two-dimensional ∞2 [B5O9]3- layer. Symmetry-center related layers are stacked along the b axis and held together by Na+ and Sr2+ cations via electrostatic interactions.     

Intermediate states on the way to edge-sharing BO4 tetrahedra in M6B22O39·H2O (M=Fe, Co)

The new borates Fe(II)(6)B(22)O(39)·H(2)O (colourless) and Co(II)(6)B(22)O(39)·H(2)O (dichroic: red/bluish) were synthesised under the high-pressure/high-temperature conditions of 6 GPa and 880 °C (Fe)/950 °C (Co) in a Walker-type multi-anvil apparatus. The compounds crystallise in the orthorhombic space group Pmn2(1) (Z=2) with the lattice parameters a=771.9(2), b=823.4(2), c=1768.0(4) pm, V=1.1237(4) nm(3), R(1)=0.0476, wR(2)=0.0902 (all data) for Fe(6)B(22)O(39)·H(2)O and a=770.1(2), b=817.6(2), c=1746.9(4) pm, V=1.0999(4) nm(3), R(1)=0.0513, wR(2)=0.0939 (all data) for Co(6)B(22)O(39)·H(2)O. The new structure type of M(6)B(22)O(39)·H(2)O (M=Fe, Co) is built up from corner-sharing BO(4) tetrahedra and BO(3) groups, the latter being distorted and close to BO(4) tetrahedra if additional oxygen atoms of the neighbouring BO(4) tetrahedra are considered in the coordination sphere. This situation can be regarded as an intermediate state in the formation of edge-sharing tetrahedra. The structure consists of corrugated multiple layers interconnected by BO(3)/BO(4) groups to form Z-shaped channels. Inside these channels, iron and cobalt show octahedral (M1, M3, M4, M5) and strongly distorted tetrahedral (M2, M6) coordination by oxygen atoms. Co(II)(6)B(22)O(39)·H(2)O is dichroic and the low symmetry of the chromophore [Co(II)O(4)] is reflected by the polarised absorption spectra (Δ(t)=4650 cm(-1), B=878 cm(-1)).     

Role of anions and reaction conditions in the preparation of uranium(VI), neptunium(VI), and plutonium(VI) borates

U(VI), Np(VI), and Pu(VI) borates with the formula AnO(2)[B(8)O(11)(OH)(4)] (An = U, Np, Pu) have been prepared via the reactions of U(VI) nitrate, Np(VI) perchlorate, or Pu(IV) or Pu(VI) nitrate with molten boric acid. These compounds are all isotypic and consist of a linear actinyl(VI) cation, AnO(2)(2+), surrounded by BO(3) triangles and BO(4) tetrahedra to create an AnO(8) hexagonal bipyramidal environment. The actinyl bond lengths are consistent with actinide contraction across this series. The borate anions bridge between actinyl units to create sheets. Additional BO(3) triangles and BO(4) tetrahedra extend from the polyborate layers and connect these sheets together to form a three-dimensional chiral framework structure. UV-vis-NIR absorption and fluorescence spectroscopy confirms the hexavalent oxidation state in all three compounds. Bond-valence parameters are developed for Np(VI).     

Crystal Structure of Borophosphate with 6_1 Screw Axis Helices

1 INTRODUCTION Most materials with nonlinear optical pro- perties and electro-optical applications are either borates or phosphates. LBO(LiB3O5), KTP(KtiO- PO4), BBO(b-BaB2O4) and KDP(KH2PO4) are well- known commercially and extensively used for different optical elements. In recent years, the compounds combined both borate and phosphate groups have been synthesized and structurally characterized with quite different anionic partial structures. In particular, the use of hydrot…     

A Novel Inorganic-organic Hybrid Borate with Unique One-dimensional Infinite Aluminium-oxygen Chains

A novel inorganic-organic hybrid borate,[Al2(fum)(H3BO3)(OH) 4]n·n(H3BO3) (1,H2fum = fumaric acid) ,has been synthesized and characterized by single-crystal X-ray diffraction,FTIR and elemental analysis. Crystal data for compound 1: orthorhombic,space group Pnma,a = 14.108(3) ,b = 6.9412(14) ,c = 14.995(3) ,V = 1468.3(5) 3,Z = 4,Mr = 359.72,Dc = 1.627 g/cm3,μ = 0.254 mm-1,F(000) = 736,the final R = 0.0492 and wR = 0.1650 with I > 2σ(I) . In compound 1,each AlⅢ ion is coordinated by six oxygen atoms to adopt a distorted octahedral geometry. Both fumarate anion and the coordinated boric acid act as bidentate bridging ligands to link two neighboring AlⅢ centers simultaneously. Each AlⅢ ion is bridged by two μ2-hydroxyl ligands to construct an infinite wave-like [Al2(fum)(H3BO3)(OH) 4]n chain. These one-dimensional chains form hydrogen bonds with free boric acid molecules giving rise to a three-dimensional supramolecular network.     

Structure of Low Temperature Phase β—Ba3Y（BO3）3 Crystal

Crystals of the low temperature phase β-Ba3Y(BO3)3 have been synthesized by the flux method. The structure of the title compound crystallizes in the hexagonal system, space group P63cm with the following parameters: a = 9.416(3), c = 17.536(8) A, V= 1346.6(8) A3, Ba3YB3Og,Mr = 677.36, Z = 6, Dc = 5.012 g/cm3, λ(MoKα) = 0.71073 A,μ = 19.409 mm- 1, Flack parameter =0.02(3), F(000) = 1764, R = 0.0714 and wR = 0.1696 for 1076 observed reflections with Ⅰ＞ 2σ(Ⅰ).The compound contains two sets of YO6 octahedra, four sets of BaO9 polyhedra and three sets of BO3 planar triangles.     

Effects of large halides on the structures of lanthanide(III) and plutonium(III) borates

Reactions of LnBr(3) or LnOI with molten boric acid result in formation of Ln[B(5)O(8)(OH)(H(2)O)(2)Br] (Ln = La-Pr), Nd(4)[B(18)O(25)(OH)(13)Br(3)], or Ln[B(5)O(8)(OH)(H(2)O)(2)I] (Ln = La-Nd). Reaction of PuOI with molten boric acid yields Pu[B(7)O(11)(OH)(H(2)O)(2)I]. The Ln(III) and Pu(III) centers in these compounds are found as nine-coordinate hula-hoop or 10-coordinate capped triangular cupola geometries where there are six approximately coplanar oxygen donors provided by triangular holes in the polyborate sheets. The borate sheets are connected into three-dimensional networks by additional BO(3) triangles and/or BO(4) tetrahedra that are roughly perpendicular to the layers. The room-temperature absorption spectrum of single crystals of Pu[B(7)O(11)(OH)(H(2)O)(2)I] shows characteristic f-f transitions for Pu(III) that are essentially indistinguishable from Pu(III) in other compounds with alternative ligands and different coordination environments.