The thermal dehydration of crystalline barium hydroxide octahydrate has been studied. Gradual thermal treatment in air leads to the formation of a dihydrate, in addition to the monohydrate. Anhydrous barium hydroxide is formed at 375°C. Barium oxide is formed at about 410°C in an inert atmosph...

Three Ba2+/UO22+ methylenediphosphonates have been prepared from mild hydrothermal treatment of uranium trioxide, methylendiphosphonic acid (C1P2) with barium hydroxide octahydrate, barium iodate monohydrate, and small aliquots of HF at 200 °C. These compounds, Ba[UO2[CH2(PO3)2]·1.4H2O (Ba-1),...

The blue luminescent material BaQ2 was synthesized greenly in water medium in a yield of 96.09%. The structure of BaQ2 was characterized by Fourier transform infrared absorption spectroscopy (FTIR) and the vibrational absorption peak of Ba-O was detected at 480 cm−1. X-ray diffraction (XRD) resu...

This paper presents the effect of barium hydroxide on the setting mechanism of lime-based conservation mortars, when used as an additive material. The study focuses on the monitoring of the setting process and the identification of the mineral phases formed, which are essential for furthering th...

This paper presents an experimental investigation on phase change behavior of a newly prepared nanofluid as PCM containing barium hydroxide octa hydrate and Al2O3 nanoparticles (NPs). The nano-particles are dispersed into the base fluid in various mass fractions (0.5, 1.0, 1.5 and 2.0%) and thei...

Synthesis of rubber oil methyl ester (ROME) employing a two-step procedure, esterification using homogeneous catalyst followed by transesterification with heterogeneous catalyst was studied. The acid value of extracted RSO was reduced from 24 mg KOH/g to 2 mg KOH/g during esterification using 1....

Phase change materials have a predominant role in heat storage technology. This paper focused on experimental study of barium hydroxide octahydrate (BHO-Ba(OH)2·8H2O), which is a low temperature phase change material with the melting point at 78 °C and a large latent heat with reported values ...

We report the observation of superconductivity in intermetallic thorium-based boride carbides. For ThM2B2C, superconducting Tc's of 6 K (M=Ni), 6.5 K (M=Pt), and 14.5 K (M=Pd) have been measured. These compounds are isostructural with the recently reported LnNi2B2C superconductors. We have ...

A new borate [C6H16N][B5O6(OH)4] (1) is synthesized hydrothermally by the reaction of isopropyltrimethylammonium hydroxide with boric acid. It crystallizes in the triclinic space group P-1 with the parameters a=9.1578(10) Å, b=9.372(9) Å, c=9.9812(10) Å, α=66.508(2)°, β=74.751(2)°, γ=81.893...

Strontium alumino borate glasses doped with Mn2+ ions (SABM) have been prepared and characterized by XRD, density, Electron paramagnetic resonance (EPR), FT-IR and Raman to investigate the spectral and physical properties of the present glass samples. The FTIR spectra revealed the presence of BO...

In this study, microstructure such as intra-molecule interaction BO,OO in polyborate anions (B3O3(OH)4-, B4O5(OH)4-) and inter-molecule (BO(W),M(Rb/Cs)O, M(Rb/Cs)B and OO, M-M i.e.) interaction have been taken into consideration by model calculation with the method of X-ray scattering. The model...

Zirconium diboride ceramics produced using commercial ZrB2 powders, and milled with zirconium diboride grinding media, were fabricated by hot-pressing at temperatures of 2100–2200 °C with hold times of 30–120 min. This ZrB2 exhibits no additional impurities typically introduced by milling wit...

Niobium diboride (NbB2) is synthesized and consolidated by the spark plasma sintering technique. Elemental reactants such as niobium (Nb) and boron (B) were subjected to two stage heat treatment, initially at 1200 °C for synthesis and followed by densification at the temperatures in the range o...

Spark plasma sintering (SPS) experiments were conducted to investigate the effect of the processing parameters such as temperature, mechanical pressure and dwell time on densification behavior of monolithic chromium diboride. The sintering experiments were performed at different temperatures ran...

Titanium diboride (TiB2) is a low-density refractory material belonging to the family of ultra-high temperature ceramics (UHTCs). This paper reports on the production and microstructural and optical characterization of nearly fully dense TiB2, with particular interest to its potential utilizatio...

Magnesium diboride (MgB2) is a potential substitute of amorphous boron (B) as high energy density fuel. The heterogeneous decomposition and oxidation mechanisms during combustion of MgB2 were studied using a laser ignition testing system, an X-ray diffractometer, and a thermogravimetric differen...

The mechanisms during pressureless sintering of TiB2 with 0–50 wt.% Ni were analysed by differential dilatometry after mechanical alloying with hard metal beads. Three main stages of sintering could be identified by means of the changing dilatation rate. The first interval (200–600 °C) compri...

WB2 ceramic was prepared by a two-step-sintering method. First, phase-pure WB2 powder was successfully synthesised by solid-state reaction using tungsten and boron powder with a molar ratio of 1:2.5. The mixed powders were treated by pressureless high-temperature synthesis (1500 °C, 1 h, in vac...

Friction and wear properties of the hot pressed zirconium diboride were investigated at different loads and frequencies under reciprocative sliding, using a counter body of tungsten carbide (WC-Co) ball. Coefficient of friction, wear volume and specific wear rate were evaluated. Wear mechanism h...

Zirconium diboride (ZrB2) is arguably one of the most important ceramic materials for applications involving extreme high temperatures and oxidizing environments such as those encountered in re-entry vehicles and hypersonic aircraft, among others. Accordingly, enhancing the creep resistance of Z...