Phase Diagramm, Cristallization Behavior and Ferroelectric Properties of Stoichiometric Glass Ceramics in the BaO-TiO2-B2O3 System

Low‐temperature preparation of titanium diboride fine powder via magnesiothermic reduction in molten salt

“…At the test temperatures, MgCl 2 melted initially, forming a liquid pool in which Mg slightly dissolved. 28 On the other hand, part of the TiO 2 interacted with B 2 O 3 forming a eutectic liquid, 29 whereas the remaining part was still present in the molten salt as a solid phase. The Mg dissolved in the MgCl 2 salt diffused rapidly through it to the B 2 O 3 -TiO 2 eutectic liquid and the remaining TiO 2 particles, then reduced B 2 O 3 and TiO 2 to the corresponding B and Ti (Reactions (6)-(8)).…”

“…Titanium diboride (TiB 2 ) is an important ceramic material possessing many superior properties, including high melting point (3225°C), relatively low density (4.52 g/cm 3 ) and thermal expansion coefficient (7.4 9 10 À6 per K), high elastic modulus (~560 GPa) and hardness (25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35), good electrical (~10 5 S/cm) and thermal (60-120 W/m/K) conductivities, and excellent erosion and corrosion resistance. [1][2][3] Such a unique combination of excellent properties makes TiB 2 a promising candidate material for a variety of applications, for example, in impact resistant armors, cutting tools, high-temperature wear-resistant parts, electrodes in metal smelting cells, neutron absorbers, and electrocatalysts for renewable energy.…”

Synthesis and photoluminescence characteristics of (Sr, Ca)3B2O6:Eu for application in white light-emitting diodes

“…This mechanism has attracted extensive attention due to the widespread commercialization of YAG:Ce 3 þ . However, this combination shows a low color rendering index due to the lack of red component [7][8][9][10][11][12][13][14][15][16][17][18]. In order to achieve warm white, the second effort to fabricate white LEDs using tri-colored phosphors (red, green and blue) excited via a near ultraviolet (near-UV, around 350-420 nm) chip has been made.…”

“…These investigations indicate that borates posses excellent properties as host structures of phosphors due to their inherent attributes of the large band gap and covalent bond energy. The rare-earth doped borates can also exhibit tunable emission bands from blue to red region, which can be controlled by the rare-earth doping concentration and the alkaline-earth metal composition [16][17][18][19][20][21][22][23][24][25][26]. Among these rare earths, the bivalent Eu ions play a very important role as activators in the hosts because their emission can be flexibly adjusted by the crystal field and nephelauxetic effect.…”

“…Recently, the study on rare-earth doped alkaline-earth borates and silicates used as phosphors is a considerably hot topic [16][17][18][19][20][21][22][23][24][25][26]. Alkaline-earth borates, e.g.…”