Effect of Composition and Size of Crystallite on Crystal Phase in Lead Barium Titanate

Abstract

Lead titanate, barium titanate, and lead barium titanate powders (>99.9% pure), the particle size of which varied from 0.03 to 0.15 pm depending on the calcination temperature and the composition, was prepared from barium lead titanyl oxalate, which was previously prepared by reacting high-purity ammonium titanyl oxalate with barium and lead acetate. The critical crystallite size of BaTiO, powder from the cubic to the tetragonal phase is around 1 pm. Pb,,,B%,,TiO, powder with an average size of 0.057 pm showed the tetragonal phase.

Dielectric behavior of perovskite glass ceramics

“…PT in borate and silicate glass systems can be also used for high energy storage applications. The magnitude of dielectric constant and dielectric loss of glass ceramics in this system are about 219 and 0.04, respectively [105][106][107]. The paraelectric to the ferroelectric state can be held up in PT due to cryptographic cubic phase transition from tetragonal with variation temperature.…”

The size-effect on luminescence properties of BaTiO3:Eu3+ nanocrystallites prepared by the sol–gel method

“…Therefore, the investigation of size-dependence of the ferroelectric phase transition in small BaTiO 3 particles has been a subject of many reports [5][6][7][8][9][10][11]. It has been found that the ferroelectric tetragonal phase disappears for grain sizes less than 100 nm at room temperature [9,10].…”

Temperature Evolution of Sodium Nitrite Structure in a Restricted Geometry

“…there is large and important group of restricted geometry objects, namely materials confined within porous media (hereinafter we will call them confined materials -CM). In recent years properties of CM and in particular various types of phase transitions (PT) (superconducting [1,2], superfluid [3,4], melting-freezing [5,6,7,8,9,10,11] and others PTs [12,13,14,15,16,17,18,19,20,21,22] in different CM have been extensively studied by different experimental methods including calorimetry [5,7,20], NMR [9,21], ultrasonic [8,9] and dielectric [12,14,15] measurements, Raman [10,13], X-ray [12,16,17,18] and neutron scattering [10,14,22,23,24,25,26], differential thermal analysis [19] etc. It has been shown that CM can form either a system of isolated particle...…”