Some new non-stoichiometric ferroelectric phases appearing close to LiTaO3 in the ternary system Li2O-Ta2O5-(TiO2)2

Elaboration and piezoelectric properties of high-density ceramics of the system Li0.85Ca0.15Ta0.85Zr0.15O3–SiO2

“…This view has largely been confirmed by various authors including our own results. [6][7][8][9][10][11][12][13][14][15][16][17][18][19] It is also very surprising that among all known perovskite ceramics, the best piezoelectric compounds are lead-based materials. Indeed, their practical performance is excellent but since lead toxicity is now clearly evidenced, it becomes urgent for the electro-ceramic industry to find appropriate substitutes for such lead-based electronic devices.…”

Powder Synthesis and Hot‐Pressing of a LiTaO3 Ceramic

“…Dense, pure polycrystalline LiTaO 3 ceramics have never been reported, though limited success has been achieved through the use of various sintering aids such as MgF 2 or MnO x , or through extensive substitution on the A ‐site, B ‐site, or both . In addition to the difficulties associated with the extreme differences in cation activity and mobility common to alkali niobates and tantalates, LiTaO 3 has a trigonal (rhombohedral) crystal structure of space group R 3 cH with significant crystallographic anisotropy in coefficients of thermal expansion (CTE) (α a = 16 × 10 ‐6 /°C, α c = 4 × 10 −6 /°C), which leads to tremendous stresses during cooling of a consolidated body.…”

Synthesis and Ion Exchange Properties of Monoclinic Titanic Acid (H2TiO3)

“…[8] Earlier work showed that LiTa03 used as a starting material is a lithium ion conducting material, and its H+-exchanged material is a proton conducting material. [9] The pH titration curves of a cubic tantalic acid (C-TaA) on the Li+/H+ exchange system indicated a weak monobasic acid. C-TaA showed high selectively uptake for lithium ions.…”