Infrared laser-induced fast photovoltaic effect observed in orthorhombic tin oxide film

The SnO_2/SnO with an orthorhombic structure is a material known to be stable at high pressures and temperatures and expected to have new optical and electrical properties. The authors report a new finding of the infrared laser induced a fast photovoltaic effect arising from orthorhombic tin oxide film with an indirect band gap(~2.4 e V) which is deposited by pulsed laser deposition. The rising time of the photovoltaic signal is about 3 ns with a peak value of 4.48 mV under the pulsed laser beam with energy density 0.015 m J/mm~2. The relation between the photovoltages and laser positions along the line between two electrodes of the film is also exhibited. A possible mechanism is put forward to explain this phenomenon.All data and analyses demonstrate that the orthorhombic tin oxide with an indirect band gap could be used as a candidate for an infrared photodetector which can be operated at high pressures and temperatures.     

NH_4~+，尿素和聚乙二醇对蒙脱土的抑制膨胀作用

通过膨胀仪与粒度分布仪对NH_4~+, K~+，尿素和聚乙二醇（PEG）对蒙脱土／ 水悬浮体中土颗粒水化、膨胀及分钐的抑制作用进行了系统研究。发现NH_4~+与 K~+一样可通过嵌入蒙脱土晶体的六角网孔而产生相似的水化抑制作用。尿素随着 含量的升高对粘土水化产生更强的抑制作用，但存在一个最高点。PEG与K~+和 NH_4~+可形成复合物，产生协和的抑制作用，而尿素与PEG/K~+和PEG/NH_4~+的复 合是目前发现的最强的抑制蒙脱土水化分散与膨胀的体系。     

O,O′-二(4-甲苯基)二硫代磷酸-N,N-二乙铵的晶体结构、热稳定性及缓蚀性

合成了O,O′-二(4-甲苯基)二硫代磷酸N,N-二乙铵（[Et2NH2][(4-MeC6H4O)2PS2],NOP）,采用元素分析、红外光谱、核磁共振谱和单晶X射线衍射测试技术对其结构进行了表征,同时研究了NOP的热稳定性和缓蚀性。 NOP晶体属单斜晶系,P21/n空间群,晶胞参数为：a=1.424 1(3) nm,b=2.008 7(4) nm,c=1.436 6(3) nm,V=3.959 9(15) nm3,Dc=1.286 Mg/m3,Z=8,F(000)=1.632,μ(MoKα)=0.360 mm-1,S=1.001,(Δ/σ)max=0.001,R1=0.077 6,wR2=0.174 9(I＞2σ(I))。 NOP的不对称结构单元中包括2个独立的子单元,2个子单元之间通过N-H…S氢键形成了一维链结构。 在H2SO4溶液中,NOP能有效抑制Q235钢的腐蚀,是一种抑制阳极反应为主的高效混合型缓蚀剂;NOP在Q235钢表面的吸附符合Langmuir吸附等温式,属自发进行的物理和化学吸附。 CCDC813309     

三元配合物{Ni[S2P(4-MeC6H4O)]2(4-Me Py)2}的合成、晶体结构与光谱性质

以[(4-MeC6H4O)2PS2]2Ni和4-甲基吡啶(4-MePy)反应合成了三元配合物{Ni[S2P(4-MeOC6H4)]2(4-MePy)2},用元素分析、红外光谱、紫外-可见光谱和热重分析对其进行了表征,并用X-射线衍射法测定了晶体结构.该晶体属于单斜晶系,P21/n空间群;晶胞参数为:a=0.95364(...