▲图2: (a) Mt和F-Mt的Raman谱图; (b)和(c) Mo 3d和S 2p的高分辨率XPS谱图; (e)-(g) (2×2), (3×3) (4×4) MoS2超胞结构吸附Pb2+后的PDOS谱图; (h) Na+插层作用诱导MoS2中2H相转化为1T相的过程。 ...
超导体Raman光谱本文研究了Bi_2Sr_2CaCu_2O_8单晶(Tc=85K),Bi_(2-x)Pb_xSr_2Ca_2Cu_3O_y单相(Tc=107K)和Bi(Pb)-Sr-Ca-Cu-O非晶体室温下20-720cm~(-1)的Raman光谱.通过谱图的比较,我们认为456—466,631—650cm~(-1)是高Tc氧化物的特征谱,它们与Cu-O链及Cu-O面上的强电子—声子耦合有...
The Raman spectra of relaxor ferroelectrics in the single crystal Pb(ZnNb)O(PZN) have been measured with the 90°scattering geometry over a wide temperature range between 100 K and 773 K and over a frequency range up to 1000 cm. The Raman-active modes exist well above the diffuse transitio...
暗场图像清楚地识别出与LK-99相对应的粉末颗粒。 我们还进行了Raman测量,以获得有关样品的更多结构信息,如图2(c)所示。数据与参考文献[13]报道的非常相似。编号1、2和3的三个拉曼光谱表示样品表面不同位置采集的数据。很容易观察到,所有图形都显示完全相似的光谱,这表明样品是均匀的。光谱的主要峰对应磷酸盐组(PO...
Raman spectroscopy revealed a different behavior for the two phonon modes at 465 cmu22121 and 630 cmu22121 with increasing doping by Pb. The 630 cmu22121 mode remains unaffected up to the highest Pb concentration, while with 30% of Bi replaced by Pb, the 465 cmu22121 phonon disappears and ...
XRD, infrared and Raman spectroscopy, study have been performed to investigate the symmetry change in the system (1 m x)Pb(Fe 2/3 W 1/3 )O 3 -xPbTiO 3 , having different compositions. A morphotropic phase boundary have been detected for x in the range of (0.20, 0.37) at T=300K,...
The temperature-concentration dependence of the low frequency models below 100cm1 in the solid solution system (1x) Pb(Zn1/3Nb2/3)O3 - xPbTiO3 (0 鈮 x Keywords: PZN; Raman scattering; diffuse phase transition; mixed crystal; perovskite; relaxor; soft mode Document Type: Research Article ...
以五氧化二铌(Nb2O5)为原材料通过络合反应合成了铌的前驱体溶液,并与醋酸铅(Pb(Ac)2),醋酸镍(Ni(Ac)2)混合,于200℃水热条件下进行预反应.水热预产物经进一步煅烧,成功获得了纯钙钛矿相PNN粉体,采用XRD和Raman分析,研究了水热时间,溶液pH值,煅烧温度等条件对PNN粉体相结构的影响,分析了粉体的相结构变...
We report a comparative Raman study of 0.65(PbMg 1/3 Nb 2/3 O 3 )-0.35(PbTiO 3 ) (PMN-0.35PT) single crystal and thin film. Raman spectra investigation indicates a change in bulk from the high temperature cubic to the tetragonal phase and then to the low temperature Mc monoclinic ...
Raman spectroscopypolarized microscopythermal measurementsRaman spectroscopy, polarized microscopy and thermal measurements were used to investigate the sequence of phase transition in the lead oxide salts Pb8O5(XO4)2 (where X = As and V). For Pb8O5(AsO4)2, a second-order phase transition is ...