Growth and Crystal Structure of YbAl3（BO3）4

1 INTRODUCTION With the development of high power InGaAs laser diode (LD) as pump sources, the Yb3+-doped laser crystals have received much attention. Due to the simple energy level structure of the Yb3+ ions, the Yb3+-doped laser crystals have no concentration quenching, and have high quantum efficiency and low quantum defects even at high doping concentration of the Yb3+ ions[1, 2]. Therefore, the Yb3+-doped crystals are good candidates of media in the LD-pumped solid-state laser,…     

Growth and Spectral Properties of Yb^3＋-doped Ba3Gd（BO3）3 Crystal

Crystal of Yb3+-doped Ba3Gd(BO3)3 has been grown by the Czochralski method. The spectroscopic characterizations have been investigated at room temperature. The Yb3+:Ba3Gd(BO3)3 crystal exhibits broad absorption at 976nm with FWHM of 7nm and large overall spitting of 2F7/2 manifold (823cm-1). The absorption and emission cross sections are 5.09×10-21cm2 at 976nm and 0.97×10-21cm2 at 1040nm,respectively. The fluorescence lifetime is 2.84 ms.     

Synthesis and Crystal Structure of a Rubidium Lanthanum Borate Rb3La3（BO3）4

The title compound was obtained by the flux method and its structure was determined. It crystallizes in monoclinic, space group P2/c with a = 11.0024（17）, b = 9.2979（14）, c = 14.500（2） A, β = 110.879（2）°, V = 1385.9（4） A^3, Z = 4, Mr= 908.38, F（000） = 1592, p = 19.601 mm^-1, Dc = 4.353 g/cm^3, the final R = 0.0481 and wR = 0.1257 for 2532 observed reflections with I 〉 2σ（I）, The Rb3La3（BO3）4 structure can be viewed as a 3-dimensional scaffold-like framework constructed by La-O polyhedra and BO3 groups. Two Rb＋ ions locate in a channel along the a direction and the rest one in a cavity.     

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 GdMg（BO2）5 Crystal

1 INTRODUCTION With the development of diode-pumped solid-sta- te lasers, the research to find more efficient materials for these lasers is gaining more importance. The luminescent materials host LnMgB5O10 may become potential solid-state laser materials[1, 2]. Nd3 -doped GdMg(BO2)5 as a potential diode-pumped laser crystal has been grown in our lab and characterized by a very strong absorption at near 808 nm and intense emission. Although the previous work repor- ted LaMg(BO2)5 with…     

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…     

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.     

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…     

Hydrothermal Synthesis and Crystal Structure of [（CH3CH2）4N]4[（La12（OH）12MoO29）],A Novel Cluster Compound with a MoO5 Hexahedron Center surrounded by La—O Octahedron

IntroductionRecently,the molecular designs of polyox-ometalates( POM) with basic oxometal clusterbuilding blocks are of great interest[1,2 ] . Hy-drothermal synthesis,with the characteristic ofone- pot reaction,provides a convenient method toobtain novel structures of POM compounds[3— 6] . Inthe Ln/Mo/O system ( Ln=rare earth) ,somecompounds containing La and Mo elements havebeen reported[7— 17] . However,these compoundshave all been synthesized under the highly restrict-ed synthetic co…     

Structure and Crystal Growth of Li2Zn2（MoO4）3

Single crystal of Li2Zn2(MoO4)3 has been grown from a flux of Li2MoO4 by the top-seeded solution-growth method,and its structure was refined by the Rietveld method. It belongs to the orthorhombic system,space group Pnma with a=5.1114,b=10.4906 and c=17.6172. Good agreement between the experimental and calculated profile(Rp=6.69%,Rwp=9.73% and Rexp= 6.58%) was reached.     

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…     

Synthesis and Crystal Structure of a Rubidium Lanthanum Borate Rb3La3(BO3)

The title compound was obtained by the flux method and its structure was determined.It crystallizes in monoelinic,space group P2/c with a=11.0024(17).b=9.2979(14),C=14.500(2)(A),β=110.879(2)°.V=1385.9(4)(A)3,Z=4,Mr=908.38,F(000)=1592,=19.601 mm-1,Dc=4.353 g/cm3,the final R=0.0481 and wR=0.1257 for 2532 observed reflections with I>2σ(I).The Rb3La3(BO3)4 structure Can be viewed as a 3-dimensional scaffold-like framework constructed by La-O polyhedra and BOs groups.Two Rb+ ions locate in a channel along the a direction and the rest one in a cavity.     

Ein neues Kupferzinnboratoxid mit isolierten BO3-Baugruppen: Cu5Sn(BO3)2O4

On a New Copper Tin Borate Oxide with Isolated BO₃ Units: Cu₅Sn(BO₃)₂O₄ Single Crystals of the new compound Cu₅Sn(BO₃)₂O₄ were obtained by a B₂O₃ fluxtechnique. They crystallize in a monoclinic distorted variant of a Ludwigite structure with a partly ordered metal distribution. X-ray investigations on single crystals led to the space group C–P2₁/c (No. 14); a = 6.3526(7); b = 9.502(1); c = 12.100(9) Å; β = 93.30(3)°; Z = 4. All metal-sites are distorted octahedraly coordinated by oxygen-ions. The structure contains BO₃-units and oxygen which is not coordinated to boron.     

LaAl3(BO3)4的合成及其晶体结构的研究

在研究LnAl3(BO3)(Ln=稀土元素，Y）的合成及发光特性过程中，发现镧铝硼酸盐LaAl3(BO3)4具有一种新的晶体结构。本文用助熔剂法合成了LnAl3(BO3)4(Ln=Gd,La)单晶样品，LaAl3(BO3)4为薄板状，而GdAl3(BO3)4为六方的棒状，用TREOR90程序对LaAl3(BO3)4粉末样品的X射线衍射数据进行了指标化，结果为：LaAl3(BO3)4属正交晶系，晶胞参数为a=0.93586(4)nm,b=0.79904(3)nm,c=0.40626(6)nm,V=0.34595nm^3，在1000℃空气环境下，用硝酸盐热分解法合成了单相LnAl3(BO3)4:E3 （Ln=Gd,La)荧光粉并研究了其发光特性，结果表明：LnAl3(BO3)4:Eu^3 (Ln=Gd,La)是非常有前途的等离子显示器用荧光粉。     

O－（3，4－二甲苯基）－苯基－硫代膦酰基氨基异马来酰胺的合成和晶体结构

标题化合物Ｃ_（１８）Ｈ_（１７）Ｎ_２Ｏ_３ＰＳ是Ｏ－芳基苯基硫代膦酰肼与马来酸酐加成后的关环产物，其晶体属于单斜晶系，空间群Ｐ２_１／ｃ，α＝１０．７２６（３），ｂ＝１０．２４８（２），ｃ＝１７．４５４（５）Ａ，　β＝１０４．０１（２）°，Ｍｒ＝３７２．３７，Ｖ＝１８６１．４Ａ３，Ｄｃ＝１．３３ｇ／ｃｍ￣３，Ｚ＝４，μ（ＣｕＫα）＝２４．６８ｃｍ￣（－１），Ｆ（０００）＝７７６，Ｒ＝０．０７０，Ｒｗ＝０．０６７。结构由直接法解出，分子中Ｐ原子与其相邻的Ｓ，Ｏ，Ｎ，Ｃ原子形成变形四面体构型。     

O－（3，4－二甲苯基）－苯基－硫代膦酰基氨基异马来酰胺的合成和晶体结构

标题化合物Ｃ_（１８）Ｈ_（１７）Ｎ_２Ｏ_３ＰＳ是Ｏ－芳基苯基硫代膦酰肼与马来酸酐加成后的关环产物，其晶体属于单斜晶系，空间群Ｐ２_１／ｃ，α＝１０．７２６（３），ｂ＝１０．２４８（２），ｃ＝１７．４５４（５）Ａ，　β＝１０４．０１（２）°，Ｍｒ＝３７２．３７，Ｖ＝１８６１．４Ａ３，Ｄｃ＝１．３３ｇ／ｃｍ￣３，Ｚ＝４，μ（ＣｕＫα）＝２４．６８ｃｍ￣（－１），Ｆ（０００）＝７７６，Ｒ＝０．０７０，Ｒｗ＝０．０６７。结构由直接法解出，分子中Ｐ原子与其相邻的Ｓ，Ｏ，Ｎ，Ｃ原子形成变形四面体构型。     

Synthesis and Crystal Structure of Ethyl2—（2—Amino—3—ethoxycarbonyl—4H—benzopyran—4—yl）cyanoacetate

1 INTRODUCTION Inorganic solid supports as catalysts resulting in higher selectivity, milder conditions and easier work-up have been reported as useful catalysts for many reactions [1~3]. Recently, we have reported the Knoevenagel condensation catalyzed by KF-Al2O3[4]. In this paper, we discussed the crystal structure of the title compound synthesized by the reaction of salicylaldehyde and ethyl cyanoacetate in DMF using the catalyst KF-Al2O3 at room temperature KF-Al2O3. In or…     

Co(en)3[B4O5(OH)4]Cl·3H2O和[Ni(en)3][B5O6(OH)4]2·2H2O的合成、结构以及热力学性质

利用水热法合成了两种过渡金属配合物为模板剂的含水硼酸盐晶体Co(en)3[B4O5(OH)4]Cl·3H2O(1) 和 [Ni(en)3][B5O6(OH)4]2·2H2O (2),并通过元素分析、X射线单晶衍射、红外光谱及热重分析对其进行了表征。化合物1晶体结构的主要特点是在所有组成Co(en)33+, [B4O5(OH)4]2–, Cl– 和 H2O之间通过O–H…O、O–H…Cl、N–H…Cl和N–H…O四种氢键连接形成网状超分子结构。化合物2晶体结构的特点是[B5O6(OH)4]–阴离子通过O–H…O氢键连接形成沿a方向有较大通道的三维超分子骨架,模板剂[Ni(en)3]2+阳离子和结晶水分子填充在通道中。