Results 1 to 10 of about 16,793 (198)

A Comparative Study of the Gemological Characteristics and Inclusions in Spinels from Myanmar and Tajikistan

Crystals, 2022
Currently, most of the popular spinels in the jewellery market come from Myanmar and Tajikistan. It is well known that provenance is one of the main factors affecting the value of a gemstone, and the geographic origin of a gemstone can be determined by ...
Yi Zhang, Jing-Ran Zhu, Xiao-Yan Yu
doaj   +1 more source

The Österplana Fossil Meteorites and… What Else? Terrestrial Cr-Spinels and Zircons in the Ordovician Limestones of the Thorsberg Quarry (Sweden)

Geosciences, 2022
In the Ordovician limestone of the Thorsberg quarry (South Sweden), about 130 meteorites have been found. Among the extraterrestrial material, several terrestrial Cr-spinels and zircons have been found too. In particular, in the interval 416–447 cm above
Davide Lenaz, Matteo Velicogna, Maurizio Petrelli, Birger Schmitz   +3 more
doaj   +1 more source

Characterization of Red, Pink, Orange, and Purple Gem-Quality Spinel from Four Important Areas

Crystals, 2023
Spinel is a precious stone with a long history. In ancient societies spinel was considered to be an imitation of ruby. With the depletion of ruby mineral resources, gem—grade spinel has attracted more and more attention from consumers. In the last decade,
Qian Xu, Bo Xu, Yujie Gao, Siying Li
doaj   +1 more source

Approaching the Ground State of Frustrated A-site Spinels: A Combined Magnetization and Polarized Neutron Scattering Study [PDF]

, 1992
We re-investigate the magnetically frustrated, {\it diamond-lattice-antiferromagnet} spinels FeAl$_2$O$_4$ and MnAl$_2$O$_4$ using magnetization measurements and diffuse scattering of polarized neutrons.
Harikrishnan S. Nair, Zhendong Fu, Jörg Voigt, Yixi Su, Th. Brückel, D. Bergman, J. A. Mydosh, P. J. Brown, I. A. Blech, O. V. Kovalev, J. S. Smart, R. J. Harrison   +11 more
core   +3 more sources

Processing and Investigation of Cd_0.5Zn_0.5Fe_2−xCr_xO₄ (0 ≤ x ≤ 2) Spinel Nanoparticles

Crystals, 2023
This study presents the synthesis of Cd0.5Zn0.5Fe2−xCrxO4 nanoparticles via the sol–gel method, along with a comprehensive characterization of their morphological, structural, infrared, and magnetic properties.
Reem Khalid Alharbi, Noura Kouki, Abdulrahman Mallah, Lotfi Beji, Haja Tar, Azizah Algreiby, Abrar S. Alnafisah, Sobhi Hcini   +7 more
doaj   +1 more source

Characterization of Cu-doped (Ni,Mn)3O4 thin films annealed at low temperatures

Journal of Asian Ceramic Societies, 2020
Negative-temperature coefficient of resistance (NTCR) thin films were prepared from (Ni0.2Mn2.8-xCux)Cl2 (0.010 ≤ x ≤ 0.040) solutions by liquid flow deposition (LFD) method.
Duc Thang Le, Jeong Ho Cho, Heongkyu Ju
doaj   +1 more source

Distinction of Gem Spinels from the Himalayan Mountain Belt

CHIMIA, 2010
Gem spinel deposits in Myanmar, Vietnam and Tajikistan have their formation in association with Himalayan orogenesis. Gem-quality orange, pink, red and purple spinels from deposits at Mogok (Myanmar), Luc Yen (Vietnam), and Kuh-i-Lal (Tajikistan)
Anna Malsy, Leonhard Klemm
doaj   +1 more source

First-principle computations of ferromagnetic HgCr2Z4 (Z = S, Se) spinels for spintronic and energy storage system applications

Journal of Materials Research and Technology, 2020
We explored electronic spin-dependent physical aspects of ferromagnetic HgCr2Z4 (Z = S, Se) spinels using density functional theory (DFT) for spintronic and energy storage applications.
Asif Mahmood, Shahid M. Ramay, Waheed Al-Masry, Charles. W. Dunnill, Najib Y.A. Al-Garadi   +4 more
doaj   +1 more source

Exploration of magnesium based MgX2O4 (X = Rh, Bi) spinels for thermoelectric applications using density functional theory (DFT)

Journal of Materials Research and Technology, 2020
By using WIEN2k code, we investigated the mechanical and thermoelectric properties of magnesium based MgX2O4 (X = Rh and Bi) spinels. To compute the mechanical behavior of MgX2O4 (X = Rh and Bi), the Perdew-Bruke-Ernzerhof (PBEsol) flavor of generalized ...
Farzana Majid, M. Tauqeer Nasir, Eman Algrafy, Muhammad Sajjad, N.A. Noor, Asif Mahmood, Shahid M. Ramay   +6 more
doaj   +1 more source

Spin-phonon coupling in antiferromagnetic chromium spinels [PDF]

, 2007
The temperature dependence of eigenfrequencies and intensities of the IR active modes has been investigated for the antiferromagnetic chromium spinel compounds CdCr2O4, ZnCr2O4, ZnCr2S4, ZnCr2Se4, and HgCr2S4 by IR spectroscopy for temperatures from 5 K ...
Hemberger, J., Kant, Ch., Loidl, A., Mayr, F., Rudolf, T., Tsurkan, V.   +5 more
core   +4 more sources