共查询到18条相似文献,搜索用时 62 毫秒
1.
用金刚石对顶砧高压显微光谱系统在高达66kbar的流体静压力和光谱波段为400—900nm范围内,用透射光干涉谱法测量了非晶态As2S3(a-As2S3)的光学折射率n与压力p以及波长λ的变化关系。a-As2S3的折射率对压力极为敏感,在波长为650nm,压力从1bar变到66kbar时,它增加35%。在计算机上用最小二乘法对实验点进行拟合的结果得到:对某一波长λ来说,遵循n(P)=n(0)+Ap+Bp2的非线性关系。其中n(p)和n(0)是p压和常压下的折射率,A和B是与波长有关的系数,文中给出了A和B的具体参数。这个关系与Weinstein和Galkiewicz等人公布的n(p)和p之间遵循线性关系不同。
关键词: 相似文献
2.
用金刚石对顶砧高压显微光谱系统在0—66 kbar的流体静压力范围内测量了a-As_2S_3的光学吸收达随压力的移动特性。发现a-As_2S_3的光学吸收边随压力的增加而迅速红移。在计算机上用最小二乘法对实验点进行了拟合,结果得出吸收边和压力之间的关系为:E_g(P)=E_g(0)-1.31×10~(-3)P-3.91×10~(-4)P~2 4.04×10~(-6)P~3值得注意的是|dE_g/dP|和压力之间的关系经历了一个先是增大,然后再减小以至于趋于饱和的过程。这和Weinstein等人先前的实验结果是有所不同的。 相似文献
3.
用金刚石对顶砧高压显微光谱系统在高达66kbar的流体静压力和光谱波段为400—900nm范围内,用透射光干涉谱法测量了非晶态As_2S_3(a-As_2S_3)的光学折射率n与压力p以及波长λ的变化关系。a-As_2S_3的折射率对压力极为敏感,在波长为650nm,压力从1bar变到66kbar时,它增加35%。在计算机上用最小二乘法对实验点进行拟合的结果得到:对某一波长λ来说,遵循n(P)=n(0) Ap Bp~2的非线性关系。其中n(p)和n(0)是p压和常压下的折射率,A和B是与波长有关的系数,文中给出了A和B的具体参数。这个关系与Weinstein和Galkiewicz等人公布的n(p)和p之间遵循线性关系不同。 相似文献
4.
5.
K. Matsuishi T. Anzaki S. Onari T. Arai 《International Journal of Infrared and Millimeter Waves》1989,10(7):745-750
Far infrared absorption spectra of amorphous (As2S3)1–x(Sb2S3)x system (x=0.00.6) were measured in the wavenumber region 725 cm–1 with Lamellar grating far infrared Fourier Transform Spectrometer, and the spatial fluctuation of charges and its correlation range were estimated with charge fluctuation model. The charge fluctuation of (As2S3)1–x(Sb2S3)x system increases with Sb2S3 concentration x. On the other hand, the correlation length of the charge fluctuation decreases from 7 A to 4.5 A with an increase in x. As a result, it can be found that the medium range order of As2S3 changes drastically with an incease in Sb2S3 concentration x. 相似文献
6.
实验研究发现AZ5214光刻胶在一定曝光剂量下显影后会留存一定厚度的底膜,该底膜可以在干法刻蚀过程中避免As-S薄膜与碱性显影液直接接触,减轻薄膜表面损伤,起到保护作用。基于此,采用该底膜作为保护层制备As2S3脊型波导,研究结果表明,在AZ5214光刻胶匀胶厚度为2.1μm、紫外曝光剂量为200 mJ/cm2、显影时间为45 s的条件下会留存约为220 nm厚的光致保护层,该条件下保护层均匀性较好,且在刻蚀阶段可以完全去除。实验表明利用此保护层制备的As2S3脊型波导具有良好的形貌特征,波导脊宽约为3μm、脊高约为800 nm的As2S3脊型波导的传输损耗约为0.74 dB/cm@1 550 nm。 相似文献
7.
用金刚石对顶砧高压显微光谱系统在室温和1bar—66kbar的流体静压力范围内研究了(Zn0.85Cd0.15)S:Cu,Al磷光体的发光峰位置和相对发光强度随压力而变化的规律。随着压力的增加,发射峰值波长迅速移向短波方向,而发射峰值对应的光子能量随压力增加的速率为4.7meV/kbar(38cm-1/kbar)。这个值比该材料的吸收边随压力增加的速率要小。随着压力的增加,该磷光体的发光峰值相对强度急骤下降,当压力从常压升到66kbar时,发光峰值相对强度下降到原值的6%。这些结果可以用Al3+-Cu+的施主-受主对模型来解释。本文还估计施主(Al3+)和受主(Cu+)的激活能之和随压力增加的速率为3.7meV/kbar(30cm-1/kbar)。
关键词: 相似文献
8.
XU Chao-wen GAO Jing LI Ying QIN Fei LIU Hong YI Li CUI Yue-ju SUN Feng-xia FANG Lei-ming 《光谱学与光谱分析》2021,41(7):2087-2091
碳酸盐是碳在地球内部的重要载体之一,其在地幔高温高压条件下的晶体化学是理解地球深部碳的赋存状态和循环过程的关键,而结构稳定性和相变是晶体化学最基本的研究内容。碳酸钠(Na2CO3)是一种常见的碱性碳酸盐矿物,在产自地幔过渡带-下地幔的金刚石中已发现含钠的碳酸盐矿物包裹体,这成为碳酸钠能够俯冲进入地幔深部的直接矿物学证据。前人利用拉曼光谱技术研究了Na2CO3在常温常压下的晶格振动模式,但其在高压下的稳定性和结构变化却鲜有报道。利用金刚石压腔装置结合先进的共聚焦拉曼光谱技术,以硅油作为传压介质,在准静水压力条件下,在0.001~27.53 GPa压力区间对Na2CO3粉末在600~1 200 cm-1波段的振动特征进行了细致地分析。本次实验重点分析了[CO3]2-基团振动模式在升压和卸压过程中的行为。结果表明,在0.001~11.88 GPa压力范围内,[CO3]2-基团对称伸缩振动γ1(1 088.06和1 070.76 cm-1)、反对称伸缩振动γ3(865.10和797.50 cm-1)和面内弯曲振动γ4(720.10和696.71 cm-1)都出现了振动峰的分裂。随着压力增加,所有振动峰都向高频率漂移,半高宽也逐渐增加。在13.40 GPa时,Na2CO3发生结构相变,具体表现为690.08 cm-1处出现1条新的拉曼峰,并且随着压力升高该峰的强度逐渐增大。同时反对称伸缩振动峰γ3以及面内弯曲振动峰γ4的强度持续减弱,半高宽也继续变大。这些现象表明Na2CO3结构相变源于[CO3]2-内部晶格变化。当压力卸载到4.18 GPa时,[CO3]2-的振动模式与常温常压下的完全吻合,相变出现的新峰也已经消失,表明该相变是由[CO3]2-基团畸变引起的并且具有可逆性。继续升压至27.53 GPa,拉曼光谱继续蓝移,Na2CO3的拉曼谱线再没有变化,说明高压相在这一压强范围内保持稳定。在整个加压过程中,反对称伸缩振动γ3和面内弯曲振动γ4处的拉曼峰出现强度减弱现象。同时也计算了各个峰频率对压力的依赖系数dγ/dP,结果显示[CO3]2-基团内各个振动模式对压力的响应是不同的,这很可能与C-O键的键长有关。最后,对比发现,对称伸缩振动γ1峰的强度比反对称伸缩振动γ3和面内弯曲振动γ4峰的强度大,并且[CO3]2-基团对称伸缩振动γ1受压力影响相对较小,可以用来区别不同种类的碳酸盐矿物。 相似文献
9.
10.
Ihor Studenyak Yuriy Neimet Csaba Cserháti Sándor K?kényesi Edvardas Kazakevi?ius Tomas ?alkus Algimantas Ke?ionis Antanas Orliukas 《Central European Journal of Physics》2012,10(1):206-209
Structural studies of (Ag3AsS3)
x
(As2S3)1−x
chalcogenide superionic glasses in the compositional range x = 0.3–0.9 were performed by scanning electron microscopy. Temperature and compositional dependences of transmission coefficient,
electrical conductivity, and activation energy were investigated 相似文献
11.
Existence of As3S2 compound which is stable in a certain temperature range higher than room temperature has been confirmed in AsAs2S2 system. Photo-synthesis effect of As3S2 crystal from As and As2S2 mixture, namely light induced conversion from a crystalline state to another crystalline state, has also been investigated. 相似文献
12.
During thermal annealing or light irradiation, the changes in the valence states of vapour-deposited As2S3 and As4S4 films were observed by UPS. The experimental results reveal that an as-deposited As2S3 film contains considerable numbers of As4S4 molecular units, which polymerize or cross link to form a As2S3 glassy network on annealing or irradiation. 相似文献
13.
The piezobirefringence of amorphous As2S3 was measured in the wavelength range 0.69 to 1.15 μ, and the pressure dependence of the index of refraction was determined at 0.633 and 1.15μ. The dispersion of the photoelastic constants of As2S3 is discussed using a one-oscillator model, and compared with the results of a similar analysis performed on GaAs. 相似文献
14.
Raman-scattering spectra of α-As4S4 and β-As4S4 have been determined at 300 and 10 K. Although similar in overall aspect, the spectral signatures of the two polymorphs are clearly distinct. We have made a careful comparison of these first-order crystal line spectra to the sharp features reported in the Raman spectra of freshly-deposited films of amorphous As2S3. Prior proposals for the presence of As4S4 molecules in the unannealed films are supported by these comparisons, but recent contentions that actual microcrystals of β-As4S4 are present in the as-deposited material are clearly contradicted by the absence of any of the lattice-phonon lines which are prominent in the crystals at frequencies below 70 cm-1. 相似文献
15.
Photodarkening phenomena have been studied in glassy As2S3 films under pressure up to 3 kbar. A remarkable shift of the absorption edge to lower energy by the band gap illumination is observed under pressure. The shift is quenched even after releasing pressure. X-ray diffraction studies have also been performed at various pressures. The first sharp diffraction peak disappears at 50 kbar. The origin of the observed enhancement of the photodarkening may be associated with the increase in the interlayer correlation by application of pressure. 相似文献
16.
The conductivities of mixed As2S3Sb2S3 thin films are discussed. Temperature independent a.c. data are interpreted in terms of a hopping mechanism where correlation effects are important. Excepting As2S3, which exhibits extrinsic behaviour, the dielectric constant, a.c. conductivity and d.c. conductivity pre-exponential factor, all scale approximately linearly with composition. 相似文献
17.
18.
Resonance Raman scattering from amorphous As2S3, obtained by temperature tuning the band edge through the He-Ne 6328 Å laser line, is reported. 相似文献