BSCT (Ba₀.₉Sr₀.₀₅Ca₀.₀₅TiO₃)

BSCT is the abbreviation used in the Min Xing et al. dossier for a strontium- and calcium-doped barium titanate piezoelectric ceramic powder with the nominal composition Ba₀.₉Sr₀.₀₅Ca₀.₀₅TiO₃. It is the active material in the tooth-whitening and remineralization claims described in Min Xing et al., Sr-Ca-Ba-TiO₃ Toothpaste: Whitening and Remineralization Dossier and in patent CN119430910 — Piezoelectric Ceramic Powder for Whitening and Mineralizing Teeth.

Composition

The patent gives the general formula:

Ba(1-2x)Sr(x)Ca(x)TiO3

with a preferred embodiment of x = 0.05. Strontium and calcium substitute for barium in equal molar amounts on the perovskite A-site. The parent compound is Barium Titanate (BaTiO₃) (BaTiO₃), a well-established ferroelectric and piezoelectric ceramic; BSCT is a doped variant of it.

Reported properties

All of the following are as reported by the source authors; the dossier does not include the underlying raw data.

• Particle size: approximately 80 nm.
• Elemental distribution: Ti, Ba, Ca, O and Sr, reported as uniformly distributed.
• Piezoelectric behavior: butterfly-shaped displacement–voltage curves and phase-change curves, indicating polarization switching with hysteresis under applied voltage.
• Radical generation: after ultrasonic treatment, superoxide radical (•O₂⁻) and hydroxyl radical (•OH) peaks are reported to be captured, i.e. Piezoelectric Catalysis (Piezocatalysis).
• Ion release: Ca²⁺ and Sr²⁺ release is claimed to create localized ion-enriched zones on enamel and dentin, promoting Biomimetic Remineralization.

Preparation

BSCT is prepared by a Sol-Gel Synthesis route from barium, strontium and calcium acetates plus tetrabutyl titanate, with acetylacetone and ethylene glycol methyl ether as the titanium-side solvent system. The preferred embodiment uses x = 0.05, 70 °C stirring, 72 h aging, 120 °C drying and 900 °C calcination for 2 h. Full step-by-step parameters are preserved on the CN119430910 — Piezoelectric Ceramic Powder for Whitening and Mineralizing Teeth page and in the source article.

Naming caveat

The patent text contains the string "BaSrCaTiO_NER12," which appears to be an OCR or formatting artifact rather than a distinct material designation. It should not be treated as a separate compound name.

Open questions

• No independent replication of the piezoelectric, radical-generation or remineralization behavior is present in the dossier.
• No wear or abrasion data support the "nondestructive" characterization of the powder application.
• The relationship between BSCT and the other calcium-doped barium titanate powders in the listed patent family is not established by the source.