THE SYSTEM BaO–B₂O₃*

Abstract

A phase-equilibrium diagram of the system BaO-BZOa has been constructed from data obtained essentially by the quenching method. Four congruently melting compounds were identified: Ba0.4B20a, melting at 879 * 5°C.; Ba0.2BzO~. melting at 900 * 5OC.; Ba0.B208, melting a t 1095 * 5°C.; and 3Ba0.Bz03, melting at 1383 * 5°C. Some optical properties of these compounds were determined with the petrographic microscope, and X-ray diffraction data suitable for their identification were obtained. Barium metaborate, BaO. Bz03, showed an inversion occurring between 100" and 400°C. Mixtures containing less than 30% BaO were found to separate, on fusion, into two liquid layers; one layer contained 30% BaO and the other was nearly pure B~03. A curve showing indices of refraction of the quenched glasses is presented.ABSTRACT Data are presented to indicate the influence of slip preparation methods on the dry and fired properties of cast high-voltage electrical porcelain. The factors investigated include length of mixing period, sequence of electrolyte addition, aging, blunging versus ball milling, micropulverizing of constituents before blunging, filtering and reblunging application of vacuum to slip, and use of heated water. Wet ball milling influenced the

Enhanced Dielectric and Crystalline Properties in Ferroelectric Barium Titanate Thin Films

“…[18] Films were prepared from chemical solutions containing between 0 and 6.9 mol % B 2 O 3 and the necessary quantity of excess barium to form the desired composition. To simplify the discussion, compositions containing between 0 and 6.9 mol % boron oxide will be labeled 0 to 5 % secondary phase, respectively.…”

Piezoelectric characteristics of low temperature sintering Pb(Ni1/3Nb2/3)O3–Pb(Zr1/2Ti1/2)O3 ceramics as a function of Pb(Mn1/3Sb2/3)O3 substitution

“…Therefore, in this study, in order to develop the composition ceramics for multilayer ceramic for ultrasonic nozzle and ultrasonic actuator application, Pb(Mn 1/3 Sb 2/3 )O 3 substituted Pb(Ni 1/3 Nb 2/3 )O 3 -Pb(Zr,Ti)O 3 ceramics were fabricated using two-stage calcinations method and Li 2 CO 3 , Na 2 CO 3 and ZnO as sintering aids, and their piezoelectric and dielectric characteristics were investigated [4,5].…”

Review of Bi2O3based glasses for electronics and related applications

“…Several phase diagrams and property maps exist for these systems. 21,[91][92][93][136][137][138][139][140][141][142][143][144] By altering the composition, the properties, especially the processing temperature and the tendency to crystallise, can be easily and reliably tuned. Low melting glasses in this system, which have a composition relatively close to the PbO-B 2 O 3 binary eutectic, allow a reduction in binder glass amount in TF conductors, and/or a decrease of processing temperatures down to y400uC for low temperature TF conductors, dielectrics, overglazes and resistors, 67,72,85,86 for glass sealing ('solder glasses') of cathode ray tubes (CRTs) and flat panel displays (FPDs), or for glass encapsulation of semiconductor devices.…”