This work devotes to investigate synthesis and electrical properties of spinel MgCo2O4 that is considered as a candidate of the cathode materials of magnesium-ion batteries in future. Samples were synthesized by two types of techniques: solid-state reaction and wet process. The crystal structures of the samples were analyzed by X-ray diffraction, and their electrical conductivities were obtaine...

ERINGAITE-BEARING ULTRA-REFRACTORY CAI A. N. Krot, K. Nagashima, C. Ma, G. J. Wasserburg. HIGP, U. Hawai‘, USA. CalTech, USA. Introduction: Forsterite-bearing Type B (FoB) Ca,Al-rich inclusions (CAIs) are a rare type of coarse-grained igneous CAIs found almost exclusively in CV3 chondrites [1–5]. Here we describe the mineralogy, petrography, and oxygen-isotope compositions of a FoB CAI Al-2 fro...

Batteries that shuttle multivalent ions such as Mg and Ca ions are promising candidates for achieving higher energy density than available with current Li-ion technology. Finding electrode materials that reversibly store and release these multivalent cations is considered a major challenge for enabling such multivalent battery technology. In this paper, we use recent advances in high-throughput...

Introduction. The Wark-Lovering rims [1] found on many refractory inclusions are important recorders of nebular environments to which refractory inclusions were exposed after their formation, such as different temperature regimes and isotopic reservoirs [2]. As part of a large-scale survey of W-L rims to enable us to better understand the range of environments reflected in rims, an inclusion of...

Trong nghiên cứu này, vật liệu nano ZnFe2O4 được tổng hợp thành công bằng phương pháp thủy nhiệt kết với nung. Các yếu tố ảnh hưởng đến quá trình như thời gian nhiệt, độ và nung đã khảo sát. Vật đặc trưng nhiễu xạ tia X (XRD), hiển vi điện tử quét (SEM), phổ hồng ngoại (FT-IR) hấp phụ/khử phụ ni tơ (BET). Kết quả cho thấy tinh thể spinel có trật tự cao ở 120 °C, 24 h 500 °C.

Spinel has historically been one of the most highly revered gemstones. However, over an extended period of time, its popularity had suffered as a result of many factors, including its classification as “semi-precious” and a general confusion with another dominant red gemstone: ruby. More recently though, spinel has been making a strong comeback and so its popularity is once again on the rise. A...

melt fractions that percolated pervasively throughout the massif and On the basis of their structural and compositional characteristics, had a refractory, calc-alkaline character. Locally, these melts were mafic rocks in the Ronda peridotite are classified into four groups: tapped into cracks forming intrusive dykes. group A (garnet-bearing rocks) occurring in the spinel tectonite domain; group...

Li-rich layered Li1+xMnyM1-x-yO2 (or denoted xLi2MnO3·(1 -x)LiMO2, M = Ni, Co, Mn, etc.) are promising cathode materials for high energy-density Li-ion batteries. However, their commercial applications suffer from problems such as a drop in the capacity and discharge voltage during cycling. In this work, the cycling performance of a layered oxide Li1.2Ni0.13Co0.13Mn0.54O2 is improved by integra...

Introduction: Ca-, Al-rich inclusions (CAIs) from CV chondrites commonly show oxygen isotope heterogeneity among different mineral phases within individual inclusions reflecting the complex history of CAIs in both the solar nebula and/or parent bodies [1]. The degree of isotopic exchange is typically mineralspecific, yielding O-rich spinel, hibonite and pyroxene and O-depleted melilite and anor...

Serpentinite-hosted massive magnetite ore bodies are reported for the first time in Late Cretaceous Sabzevar ophiolitic belt, northeastern Iran. They show irregular and discontinuous shapes with variable sizes ranging from 30 to 60 cm. Chromian spinel grains observed within both ores host serpentinite. Magmatic chromian spinels, (Cr,Al)-spinel I, compositions close (Mg0.6,Fe0.4)(Cr1.2,Al0.75,Fe...