scholarly journals SINTESIS ZEOLIT DARI BATU APUNG (PUMICE) DAERAH IJOBALIT LOMBOK TIMUR SEBAGAI ADSORBEN LOGAM Fe

2021 ◽  
Vol 7 (2) ◽  
pp. 313
Author(s):  
Dian W. Kurniawidi ◽  
Siti Alaa ◽  
Sri Mulyani ◽  
Susi Rahayu
Keyword(s):  
Crystal Structure ◽  
Functional Group ◽  
Synthetic Zeolite ◽  
Synthesis Process ◽  
Adsorption Ability ◽  
Pumice Stone ◽  
Cubic Crystal ◽  
Adsorption Analysis ◽  
Type Zeolite ◽  
Rock Minerals

ABSTRAKAktivitas letusan besar Gunung Api Samalas di Lombok meninggalkan jejak mineral batuan beku salah satunya batu apung (pumice). Batu apung memiliki komposisi mineral utama berupa silika sebanyak 58,3%. Tujuan dari penelitian untuk identifikasi karakteristik zeolit dari batu apung sebagai adsorben logam Fe. Zeolite disintesis menggunakan metode kopresipitasi. Identifikasi gugus fungsi, kristalinitas, dan struktur kristal zeolite sintesis menggunakan FTIR dan XRD. Sedangkan analisis adsorbsi menggunakan AAS. Zeolit berhasil terbentuk dari sintesis batu apung ditandai dengan kemunculan gugus fungsi TO4 dan gugus fungsi Si-O-Si pada panjang gelombang 983,85 cm-1 dan 660,02 cm-1. Zeolit yang terbentuk dari proses sintesis batu apung yaitu tipe zeolit ZK-14 dengan struktuk kristal kubik. Adapun hasil analisis kemampuan adsorbs dari zeolite ZK-14 ini sangat baik mencapai 99,22% pada komposisi Si/Al pada 25/30. Sehingga sintesis batub apung menjadi zeolite dapat diaplikasikan sebagai penyerap logam Fe. Kata kunci: Adsorben; Batu Apung; Zeolit. ABSTRACTThe massive eruption activity of the Samalas Volcano in Lombok left traces of igneous rock minerals, one of which was pumice. The pumice has a main mineral composition of 58.3% silica. The purpose of this study is to identify the characteristics of zeolite from pumice as an adsorbent of Fe metal. Zeolite has been synthesized using a coprecipitation method. The identification of functional groups, crystallinity, and crystal structure of synthetic zeolite using FTIR and XRD. Meanwhile, AAS was implemented for the adsorption analysis. The zeolite was successfully formed from the synthesis of pumice characterized by the appearance of the TO4 functional group and the Si-O-Si functional group at wavelengths of 983.85 cm-1 and 660.02 cm-1. The zeolite fabricated from the pumice synthesis process is ZK-14 type zeolite with a cubic crystal structure. The examination results from the adsorption ability of zeolite ZK-14 are very good, reaching 99.22% at the Si/Al composition at 25/30. In fact, the synthesis of pumice into zeolite can be applied as an absorber of Fe metal. Keywords: Adsorbent; Pumice Stone; Zeolite.

scholarly journals Generalization of intrinsic ductile-to-brittle criteria by Pugh and Pettifor for materials with a cubic crystal structure

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
O. N. Senkov ◽  
D. B. Miracle
Keyword(s):  
Crystal Structure ◽  
Shear Modulus ◽  
Bulk Modulus ◽  
Single Crystal ◽  
Elastic Constants ◽  
Mechanical Analysis ◽  
Quantum Mechanical ◽  
Modulus Ratio ◽  
Cubic Crystal ◽  
The Difference

AbstractTwo classical criteria, by Pugh and Pettifor, have been widely used by metallurgists to predict whether a material will be brittle or ductile. A phenomenological correlation by Pugh between metal brittleness and its shear modulus to bulk modulus ratio was established more than 60 years ago. Nearly four decades later Pettifor conducted a quantum mechanical analysis of bond hybridization in a series of intermetallics and derived a separate ductility criterion based on the difference between two single-crystal elastic constants, C12–C44. In this paper, we discover the link between these two criteria and show that they are identical for materials with cubic crystal structures.

Materials and Photosensor Devices with High Radiation Stability

2015 ◽  
Vol 1117 ◽  
pp. 107-113 ◽  
Author(s):  
Ilariy Rarenko ◽  
Dmytro Korbutyak ◽  
Volodymyr Koshkin ◽  
Boris Danilchenko ◽  
Leonid Kosyachenko ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Metal Layer ◽  
Chemical Properties ◽  
Radiation Stability ◽  
Reactor Irradiation ◽  
High Concentration ◽  
High Radiation ◽  
Cubic Crystal ◽  
Impurity Atoms ◽  
Mixed Reactor

Semiconductor Hg3In2Te6 crystals and their analogous are solid solutions of In2Te3 and HgTe. Hg3In2Te6 crystals are congruently melted as chemical compound. Like In2Te3 the Hg3In2Te6 crystal has cubic crystal lattice with stoichiometric vacancies in their crystal structure. The electroconductivity, photoconductivity, mechanical, chemical properties of the crystals do not deteriorate after their irradiation by γ-photons with energies up to 1 MeV and doses up to 1018 cm-2 , by electrons with energies up to 300 MeV and doses up to 1019 cm-2 and by mixed reactor irradiation (filtered slow neutrons) with doses up to 1019 cm-2 [1,2]. This feature is determined by high concentration (~1021 cm-3) of stoihiometric vacancies (Vs) in crystal structure, where every third In-cation node is empty. These Vs are electroneutral, they capture all impurity atoms in these crystals and kept them in electroneutral state too. On the other hand this feature doesn't allow to form direct p-n junctions in these crystals by introducing the impurities. However, we have developed p-n junction analogues in form of Schottki diodes and corresponding photodiodes with semitransparent metal layer on single crystal Hg3In2Te6 substrate that allows irradiation to get into active region preserving this way all the advantages compared to p-n junction.

Crystal structure of a dealuminated Y-type zeolite

1974 ◽  
Vol 78 (15) ◽  
pp. 1550-1553 ◽  
Author(s):  
P. Gallezot ◽  
R. Beaumont ◽  
D. Barthomeuf
Keyword(s):  
Crystal Structure ◽  
Type Zeolite

scholarly journals Роль упругих напряжений при формировании нитридных нитевидных нанокристаллов с кубической кристаллической структурой

2019 ◽  
Vol 45 (20) ◽  
pp. 39
Author(s):  
Н.В. Сибирев ◽  
Ю.С. Бердников ◽  
В.Н. Сибирев
Keyword(s):  
Crystal Structure ◽  
Elastic Strain ◽  
Theoretical Study ◽  
Crystal Phase ◽  
Cubic Crystal ◽  
Cubic Lattice ◽  
Gan Nanowires ◽  
Sapphire Substrates

In this work, a theoretical study of the growth of nitride nanowires with metastable cubic (zincblende) crystal structure is presented. The formation of cubic lattice is explained by accounting the elastic strain in the nucleus of a new layer within the nanowire. The growth of GaN nanowires with cubic crystal phase on sapphire substrates is described.

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