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6.
Yegor D. Sinelnikov Ganglin Chen Robert C. Liebermann 《Physics and Chemistry of Minerals》1998,25(7):515-521
Polycrystalline specimens in the CaTiO3–CaSiO3 perovskite system have been hot-pressed in a 2000-ton uniaxial split-sphere apparatus (USSA-2000) at pressures up to 15 GPa
and temperature of 1550°C, for the compositions CaTiO3, Ca(Ti0.75Si0.25)O3, Ca(Ti0.5Si0.5)O3. For the specimens with the bulk densities within 1% of the X-ray density, compressional and shear wave velocity measurements
have been conducted using ultrasonic interferometry. The measured adiabatic bulk moduli (K
s
) for the CaTiO3 and Ca(Ti0.5Si0.5)O3 perovskites are 175(1) and 188(1) GPa and shear moduli (G) of 106(1) and 109(1) GPa. In situ X-ray diffraction studies at high pressure and temperature resulted in isothermal values
for K
0 of 170(5) and 185(5) GPa, respectively. For the unquenchable CaSiO3 perovskite, elasticity theory and systematics were used to predict K
0=212(7) GPa and G
0=112(5) GPa; this shear modulus is 37% less than that for (Mg,Fe)SiO3 perovskite, suggesting that CaSiO3 perovskite cannot be ignored in modeling the composition of the Earth’s lower mantle.
Received: 27 June 1997 / Revised, accepted: 25 November 1997 相似文献
7.
3.1 质子磁力仪原理3.1.1 核子的旋进原子和分子的磁矩是由原子核的磁矩,电子的自旋磁矩和轨道磁矩三部分合成的。通常电子的磁矩是以玻尔磁子μ_B 为单位,核子磁矩以核磁子μ_N为单位,而μ_N=1/1836.2μ_B可见,与电子的磁矩相比,核子的磁矩是很微弱的。这里所说的磁矩是磁偶极矩的简称,严格地说,粒子或原子核的磁矩是磁量子数最大时磁矩矢量在磁场方向分量的期望值。在质子磁力仪中,使用的工作物质有水、酒精、煤油、苯、庚烷、丙酮等富含氢的液体,在组成这些物质的分子里,电子的轨道磁矩和自旋磁矩各自成对地抵消了,如果我们不考虑原子核的磁矩,则这类物质是逆磁性的。另外,组成分子的原子如氧、碳的原子核内,质 相似文献
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11.
矿物3CaO·3Al_2O_3·BaSO_4形成过程研究 总被引：1，自引：0，他引：1
ｅｏｒｅａｎｕ等［１］研究ＣａＯＡｌ２Ｏ３Ｍｘ（ＳＯ４）Ｙ［Ｍ＝Ｍｇ２＋、Ｓｒ２＋、Ｂａ２＋、Ｚｎ２＋、Ｆｅ２＋、Ｆｅ３＋、Ａｌ３］系统中,形成类似于矿物３ＣａＯ·３Ａｌ２Ｏ３·ＣａＳＯ４（硫铝酸钙）的可能性时,报道合成了新矿物３ＣａＯ·３Ａｌ２Ｏ３·ＢａＳＯ４（简写为３ＣＡ·ＢａＳＯ４）;部分学者［２,３］研究过它的胶凝性能等。在有关文献中,研究者制备研究用纯矿物的煅烧条件、获得样品的矿相组成不尽相同。如文献［１］在温度１４００℃保温２４０ｍｉｎ,制备的样品包括铝酸钙（ＣａＯ·Ａｌ２Ｏ３… 相似文献
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20001609 Cao Changqun(Nanjing Instituteof Geology and Palaeontology,ChineseA-eodemy of Seienee、.Nan)川g,Jiangsu);Shang Qinghua The Study of Graptolite Re-f 1 eetance as the Indicator of Souree一RockMaturation in ordovieian and Silurian ofTarim Basin,ordos,Jiangsu Provinee(AeraPalaeolltologiea Siniea,ISSN 0001一6616,CN32一1188/Q,39(l),2000,P.151一156,3 illus.,2 tables,10 ref) Based on rhe graptolito refleetanee of Or-dovieian and 51]urian in Tar一rn Basi;z,Ordos,J iangsu Provin… 相似文献
15.
超临界流体中MoO3与WO3溶解度实验探讨 总被引：1，自引：1，他引：1
超临界地质流体以其独特的性质对金属成矿元素具有超强的萃取、层析和搬运能力,在热液矿床成矿机制研究中对揭示成矿物质的源、流和汇起着特殊和重要作用。本文利用分析纯H2MoO4在高温下脱水制备了MoO3(白色斜方晶系),在冷封式高压釜中实验测定了417℃超临界条件下,MoO3在纯水中的溶解度分别为7.3(29MPa)、14.2(45MPa)、21.6(55MPa)、27.7(78MPa)、32.5(100MPa)、和34.2(150MPa)mmol/l,热液中钼的存在形式为H2MoO4。依据前人的实验方案,补充测定了WO3在4.0%NaCl水溶液中于450%条件下的溶解度,其值分别为27.51(50MPa)和30.52(100MPa)mmol/l。结合前人研究结果发现,MoO3、WO3的溶解度在临界区域内具有超临界现象,在超临界条件下其溶解度与石英的超临界溶解度行为基本相似,表现为溶解度随体系温度和压力的升高而增大,这对揭示岩浆热液型和石英脉型钨、钼矿床的形成机制具有重要指导作用。 相似文献
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Gianluca Iezzi Tiziana Boffa-Ballaran Catherine McCammon Falko Langenhorst 《Physics and Chemistry of Minerals》2005,32(3):197-207
Germanate garnets are often used as isostructural analogues of silicate garnets to provide insight into the crystal chemistry and symmetry of the less accessible natural garnet solid solutions. We synthesised two series of germanate garnets at 3 GPa along the joinVIIICa3VI(CaGe)IVGe3O12–VIIICa3VIFe2IVGe3O12 at 900 °C and 1,100 °C. Samples with compositions close to the CaGeO3 end-member consist of tetragonal garnet with a small amount of triclinic CaGe2O5. Samples with nominal compositions between XFe=0.4 and 1.0 consist of a mixture of tetragonal and cubic garnets; whereas, single-phase cubic garnets were obtained for compositions with XFe>1.2 (XFe gives the iron content expressed in atoms per formula unit, and varies between 0 and 2 along the join). Run products which were primarily single-phase garnet were investigated using Mössbauer spectroscopy. Spectra from samples synthesised at 1,100°C consist of one well-resolved doublet that can be assigned to Fe3+ in the octahedral site of the garnet structure. A second doublet, present primarily in samples synthesised at 900°C, can be assigned to Fe2+ at the octahedral sites of the garnet structure. The relative abundance of Fe2+ decreases with increasing iron content. Transmission electron microscopy analyses confirm this tendency and show that the garnets are essentially defect-free. The unit-cell parameters of tetragonal VIIICa3VI(CaGe)IVGe3O3 garnet decrease with increasing synthesis temperature, and the deviation from cubic symmetry becomes smaller. Cubic garnets show a linear decrease of unit-cell parameter with increasing iron content. The results are discussed in the context of iron incorporation into VIIIMg3VI(MgSi)IVSi3O3 majorite. 相似文献
18.
1 937/P,30(4),1 995.p.321一328,2 graphs1 rable,8 ref,with English absrraer)962149 Yong Ruidong(In、titute of Geolo-gy,Guizhou Bureau of Geology and MineralResourees);Yang Chengxi THE CAR-BONIFEROUS TRACEF()SSILS INGUIZll0U:DISCUSSION ON DISTRIBU-TION OF ZOOPHYCOS THROUGHOUTGEOLOGIC HISTORY(GZG,ISSN 1000一5943,CN52一1059/P,12(4),1995,l,.290一297,2 graphs,1 plat。,1 2 rof) l’raee fossils臼rc abundant in fhe Cdr-bonlferous strata,esPeelally in those … 相似文献
19.
无机材料对PVA-H3BO3包埋固定化方法的改进 总被引：2，自引：0，他引：2
利用无机材料活性炭纤维、泥炭、蛭石、高岭土、珍珠岩、钙基膨润土、粉末活性炭和硅藻土对PVA-H3BO3固定化方法进行改进,包埋固定已筛选的阿特拉津降解菌,制成生物微球,在10℃条件下考察其对生物微球溶胀行为及生物微球去除阿特拉津效果的影响。结果表明,空白生物微球和高岭土改性生物微球对AT的去除符合零级动力学方程,其余10种生物微球对AT的去除符合一级动力学方程。活性炭改性生物微球对AT的去除半衰期最短,为2.61h;硝化泥炭改性生物微球对AT的去除半衰期最长,为39.93h。结合实验现象和扫描电镜分析结果显示,强碱泥炭、硅藻土、蛭石、130℃烘干泥炭、磺化泥炭、珍珠岩改性生物微球和未添加无机材料改性的生物微球未发生溶胀现象。 相似文献
20.
昆明白泥井3号隧道围岩稳定性FLAC3D模拟 总被引：4，自引：2，他引：4
应用FLAC^3D数值模拟软件对昆明白泥井3号隧道围岩稳定性进行了分析和评价。结果表明隧道支护后围岩的最大变形出现在隧道右侧拱顶，为1．00cm；隧道支护后左侧拱和右侧拱脚处剪应变明显增大，为应力集中区；围岩可以通过自身应力、应变和能量的调整，使整个隧道围岩处于稳定状态；同时也表明FLAC^3D用于隧道围岩变形分析是可行的。 相似文献