Negative thermal expansion in one-dimension of a new double sulfate AgHo(SO_(4))_(2)with isolated SO_4 tetrahedra  

作　　者：Yuriy G.Denisenko Victor V.Atuchin Maxim S.Molokeev Naizheng Wang Xingxing Jiang Aleksandr S.Aleksandrovsky Alexander S.Krylov Aleksandr S.Oreshonkov Alexander E.Sedykh Svetlana S.Volkova Zheshuai Lin Oleg V.Andreev Klaus Müller-Buschbaum 

机构地区：[1]Institute of Chemistry,Tyumen State University.Tyumen,625003,Russia [2]Institute of Inorganic and Analytical Chemistry,Justus-Liebig-University of Giessen,35392,Giessen.Germany [3]Department of General and Special Chemistry,Industrial University of Tyumen,Tyumen,625000,Russia [4]Laboratory of Optical Materials and Structures,Institute of Semiconductor Physics,SB RAS,Novosibirsk,630090,Russia [5]Laboratory of Semiconductor and Dielectric Materials,Novosibirsk State University,Novosibirsk,630090,Russia [6]Research and Development Department.Kemerovo State University,Kemerovo,650000,Russia [7]Laboratory of Crystal Physics,Kirensky Institute of Physics,Federal Research Center KSC SB RAS,Krasnoyarsk,660036,Russia [8]Siberian Federal University,Krasnoyarsk,660041,Russia [9]Department of Physics,Far Eastern State Transport University,Khabarovsk,680021,Russia [10]Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing,100190,China [11]Laboratory of Coherent Optics,Kirensky Institute of Physics.Federal Research Center KSC SB RAS,Krasnoyarsk,660036,Russia [12]Institute of Nanotechnology,Spectroscopy and Quantum Chemistry,Siberian Federal University,Krasnoyarsk,660041,Russia [13]Laboratory of Molecular Spectroscopy,Kirensky Institute of Physics,Federal Research Center KSC SB RAS,Krasnoyarsk,660036,Russia [14]Center for Materials Research(LaMa),Justus-Liebig-University Giessen,Giessen,35392,Germany [15]University of the Chinese Academy of Sciences,Beijing,100049,China [16]Laboratory of the Chemistry of Rare Earth Compounds,Institute of Solid State Chemistry,UB RAS,Ekaterinburg,620137,Russia

出　　处：《Journal of Materials Science & Technology》2021年第17期111-121,共11页材料科学技术（英文版）

基　　金：the Russian Foundation for Basic Research(Nos.18-02-00754 and 18-32-20011);the National Scientific Foundations of China(No.11974360);the Russian Science Foundation(No.19-42-02003,in the part of conceptualization);Basic Project of the Ministry of Science of the Russian Federation in part of XRD,luminescent and Raman studies。

摘　　要：A double holmium-silver sulfate was obtained for the first time.The temperature intervals for the formation and stability of the compound were determined by differential scanning calorimetry.The crystal structure of AgHo(SO_(4))_(2)was determined by Rietveld method.The X-ray diffraction(XRD)analysis showed that the compound crystallizes in the monoclinic syngony,space group P2_1/m,with the unit cell parameters a=4.71751(4)A,b=6.84940(6)A and c=9.89528(9)A,β=95.1466(4)·,V=318.448(5)A^(3),Z=2,R_B=1.55%,T=303 K.Two types of sulfate tetrahedra were found in the structure,which significantly affected the spectral properties in the infrared range.In the temperature range of 143-703 K,a negative thermal expansion along the b direction accompanied by a positive thermal expansion along the a and c directions was observed.It was established that negative thermal expansion is the result of the deformation of sulfate tetrahedra,which is affected by the movement of holmium and silver atoms.The excitation in the blue spectral range(457.9 nm)produces a luminescence in light blue(489 nm),green(545 nm)and red(654 nm)spectral ranges,and the latter two were of comparable intensity that is favorable for WLED sources.The observed luminescent band distribution is ascribed to the specific crystal field at Ho^(3+)ion sites rather than a variation of radiationless probability.

关 键 词：SULFATE Crystal structure Thermal expansion RAMAN Photoluminescence Band structure 

分 类 号：TB34[一般工业技术—材料科学与工程]