Introduction: Spinel minerals with 'normal' structure are common in extraterrestrial materials and can form via a large range of processes including nebular condensation, crystallization from liquid melts and sub-solidus metamor-phic reactions. Owing to their ability to accept a large range of cations in their crystal structures these minerals can be regarded as useful petrogenetic indicators w...

T he first reported work on transparent polycrystalline ceramics goes back to the 1950s. For example, some of the literature on materials discussed in this article, magnesium aluminate spinel and aluminum oxynitride spinels, traces back to late 1950s and early 1960s.1–3 The advantages of these materials over current state-of-the-art materials include • Ease of manufacturing; • Superior mechanic...

Many optical devices can achieve enhanced performance at small scales by exploiting the surface plasmon resonance. Such a plasmonic material must have large free carrier concentration. Although metals meet this criterion, their resonance cannot be chemically tuned into infrared varying By contrast, semiconducting oxides allow tuning, and several spinel-structured shown due to easy dopability of...

A wide range (y = 0.05—0.33) of Co-doped LiCo5Mn2_504 spinels were synthesized and electrochemically characterized. These Co-doped spinels showed improved specific capacity and capacity retention over pure spinels. Electrochemical impedance spectroscopy and the linear polarization resistance technique were used to determine the transport and electrochemical kinetic parameters of Co-doped spinel...

In the Ordovician limestone of Thorsberg quarry (South Sweden), about 130 meteorites have been found. Among extraterrestrial material, several terrestrial Cr-spinels and zircons found too. particular, in interval 416–447 cm above Arkeologen bed, Cr-spinels, compositionally different from previous studied same sequence, are present. Previous studies on zircon provided depositional ages that rang...

Magnetic resonance techniques at nuclei and electrons are applied to characterize the electronic structure collective magnetic excitations throughout phase diagrams of lacunar spinels GaV 4 S 8 Se showing cycloidal, Néel‐type skyrmion lattice ferromagnetically polarized phases. 71 Ga nuclear (NMR) provides a local probe rhombohedral distortion resulting uniaxial anisotropy via detection electri...

The objects of study are the Agardag and Ulor ultramafic massifs, which part South Tuva ophiolite belt. aim this work is to petrographic, petrochemical geochemical features harzburgites dunites studied massifs. As a result petrographic study, main types rocks that make up massifs were identified. Harzburgites predominate in massif, while more common massif. In often plastically deformed by synt...

Baft ophiolite mélange is a part of Naein-Baft ophiolite (southeast of Kerman province in Iran). Serpentinites from Baft ophiolite mélange contain different types of spinels such as chromite, chromespinel, ferritchromite and magnetite which can reveal different stages of evolution in host serpentinites. The compositions of Baft chromites show that they belong to podiform chromitites that may ha...

In the present study, we collected and investigated spinels from Man Sin deposit in Myanmar using standard gemological testing, microscopic observation, EDXRF, Raman spectrometry. The color observation was performed under various lighting conditions to show differences. A very high Cr/Fe ratio is linked with exceptionally strong red fluorescence. Microscopic spectroscopy identified mineral incl...

Introduction: The chemical and physical processes by which spherules form during the condensation of impact-produced rock vapor clouds are poorly understood. Although efforts have been made to model the processes of spherule formation, there is presently a paucity of field data to constrain the resulting theoretical models. The present study examines the vertical compositional variability in a ...