Myrmekite in graphic granite and in vein perthite

1945 ◽  
Vol 27 (189) ◽  
pp. 79-98 ◽  
Author(s):  
Edmondson Spencer
Keyword(s):  
Solid Solution ◽  
Single Crystal ◽  
The Body ◽  
Large Single Crystal ◽  
Potash Felspar

This paper describes the occurrence of myrmekite in a graphic quartz-microcline-rock from the mica-bearing pegmatites of Kodarma, Bihar, India. The myrmekite has grown out from the quartz-mierocline junctions into the potash-felspar with the appearance of having replaced the latter. The two are in optical and crystallographic continuity and, owing to the large ‘single crystal’ character of the microcline, definitely oriented sections can readily be prepared. A detailed study of these sections shows that the myrmekite has been formed by the segregation and coalescence of microperthitic albite formerly held in solid solution in the potash-felspar. Successive stages in this process of segregation can be observed.These sections also provide evidence of the paragenetic relationship between the quartz rods, the vein perthite, and the body microcline. This is supplemented by additional evidence from graphic granites and vein perthites obtained from other localities.

Large single crystal Bi-2212 along the c-axis prepared by floating zone method

1993 ◽  
Vol 130 (1-2) ◽  
pp. 325-329 ◽  
Author(s):  
G.D. Gu ◽  
K. Takamuku ◽  
N. Koshizuka ◽  
S. Tanaka
Keyword(s):  
Single Crystal ◽  
Floating Zone ◽  
Large Single Crystal ◽  
Zone Method ◽  
Floating Zone Method

scholarly journals Facile, Green Synthesis of Large Single Crystal Copper Micro and Nanoparticles with Ascorbic Acid and Gum Arabic

2013 ◽  
Vol 03 (05) ◽  
pp. 332-336 ◽  
Author(s):  
Preston B. Landon ◽  
Alexander H. Mo ◽  
Carlos T. Ramos ◽  
Jose J. Gutierrez ◽  
Ratnesh Lal
Keyword(s):  
Ascorbic Acid ◽  
Green Synthesis ◽  
Single Crystal ◽  
Gum Arabic ◽  
Large Single Crystal ◽  
Single Crystal Copper

scholarly journals Large Single Crystal Graphene Manufacture

2017 ◽  
Vol 2 (1) ◽  
Keyword(s):  
Carbon Source ◽  
Single Crystal ◽  
Single Crystals ◽  
Large Single Crystal ◽  
Nickel Metal ◽  
Green House

Large single crystals of graphene ware made by using a solvent-catalyst of nickel metal. Both solid and liquid processes were experimented with graphene single crystals of mm demonstrated. The carbon source may be solid or gasses. For example, green house effected carbonaceous gasses could be used to strip carbon in forming large crystals of graphite that would be a source for making precious graphene.

Stress analysis of the multi-layer stagger-split die for synthesizing gem quality large single crystal diamond

2018 ◽  
Vol 83 ◽  
pp. 54-59
Author(s):  
Liang Zhao ◽  
Mingzhe Li ◽  
Rui Li ◽  
Erhu Qu ◽  
Liyan Wang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Stress Analysis ◽  
Large Single Crystal ◽  
Single Crystal Diamond

Influences of the γ′ Phase on the Mechanical Properties of a Nickel-Based Single Crystal Superalloy

2021 ◽  
Vol 1023 ◽  
pp. 45-52
Author(s):  
Xiao Yan Wang ◽  
Meng Li ◽  
Zhi Xun Wen
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Single Crystal ◽  
Tensile Properties ◽  
Room Temperature ◽  
Solution Treatment ◽  
Single Crystal Superalloy ◽  
Original Material ◽  
Solid Solution Treatment ◽  
The Matrix

After solid solution treatment at 1335°C for 4 hours and cooling to room temperature at different rate, the nickel-based single crystal superalloy were made into three kinds of nickel-based single crystal superalloy materials containing different size γ′ phases, respectively. The tensile test of I-shaped specimens was carried out at 980°C, and their effect of γ′ phase microstructure on the tensile properties was studied. The results show that the yielding strength of the material air-cooled to room temperature was lower than that with cooling rate at 0.15°C/s, but both of them were lower than the yielding strength of original material. Little difference was found on the elastic modulus of I-shaped specimens made of three kinds of materials. When the cubic degree of the γ′ phase is higher and the size is larger, the tensile properties of the material is better, which can be attributed to the larger size and narrower channel of the matrix phase that lead to higher dislocation resistance.

Crystal chemistry of lamprophyllite-group minerals from the Murun alkaline complex (Russia) and pegmatites of Rocky Boy and Gordon Butte (USA): single crystal X-ray diffraction and Raman spectroscopy study

2021 ◽  
Vol 77 (2) ◽  
Author(s):  
Sergey M. Aksenov ◽  
Anastasia D. Ryanskaya ◽  
Yuliya V. Shchapova ◽  
Nikita V. Chukanov ◽  
Nikolay V. Vladykin ◽  
...  
Keyword(s):  
Solid Solution ◽  
Single Crystal ◽  
Raman Spectra ◽  
Crystal Chemistry ◽  
Solid Solution Series ◽  
X Ray Diffraction ◽  
Alkaline Complex ◽  
Oh Groups ◽  
X Ray ◽  
Solution Series

Specific features of the crystal chemistry of lamprophyllite-group minerals (LGMs) are discussed using the available literature data and the results of the single-crystal X-ray diffraction and a Raman spectroscopic studies of several samples taken from the Murun alkaline complex (Russia), and Rocky Boy and Gordon Butte pegmatites (USA) presented here. The studied samples are unique in their chemical features and the distribution of cations over structural sites. In particular, the sample from the Gordon Butte pegmatite is a member of the barytolamprophyllite–emmerichite solid solution series, whereas the samples from the Murun alkaline complex and from the Rocky Boy pegmatite are intermediate members of the solid solution series formed by lamprophyllite and a hypothetical Sr analogue of emmerichite. The predominance of O2− over OH− and F− at the X site is a specific feature of sample Cha-192 from the Murun alkaline complex. New data on the Raman spectra of LGMs obtained in this work show that the wavenumbers of the O—H stretching vibrations depend on the occupancies of the M2 and M3 sites coordinating with (OH)− groups. Cations other than Na+ and Ti4+ (mainly, Mg and Fe3+) can play a significant role in the coordination of the X site occupied by (OH)−. Data on polarized Raman spectra of an oriented sample indicate that the OH groups having different local coordinations have similar orientations with respect to the crystal. The calculated measures of similarity (Δ) for lamprophyllite and ericssonite are identical (0.157 and 0.077 for the 2M- and 2O-polytypes, respectively), which indicates that these minerals are crystal-chemically isotypic and probably should be considered within the same mineral group by analogy to the other mineralogical groups which combine isotypic minerals.

scholarly journals Large Single‐Crystal Cu Foils with High‐Index Facets by Strain‐Engineered Anomalous Grain Growth

2020 ◽  
Vol 32 (29) ◽  
pp. 2002034 ◽  
Author(s):  
Yanglizhi Li ◽  
Luzhao Sun ◽  
Zhenghua Chang ◽  
Haiyang Liu ◽  
Yuechen Wang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Grain Growth ◽  
High Index ◽  
Large Single Crystal
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