Waaa-249 !exclusive! [ HD ]

A central aesthetic focus, emphasizing high-end costumes.

While avoiding explicit detail, the genre of WAAA-249 falls under established JAV categories: waaa-249

| Parameter | Value | Comments | |-----------|-------|----------| | | (WAA)₂Ti₄O₉·2H₂O | The “WAA” cation = (C₁₁H₂₁N₃W)⁺ | | Crystal System | Tetragonal, P4₁2₁2 (No. 92) | Non‑centrosymmetric, crucial for bulk photovoltaic effect | | Lattice Constants | a = 7.842 Å, c = 12.365 Å | Slight thermal expansion (α ≈ 2.8 × 10⁻⁶ K⁻¹) | | Band Gap | 1.12 eV (direct, Γ‑point) | Tunable to 0.9–1.4 eV via A‑site substitution | | Ferroelectric Curie Temp. | 310 K (room‑temperature) | Spontaneous polarization Pₛ ≈ 23 µC cm⁻² | | Topological Surface States | Dirac‑like, protected by C₄ rotation | Confirmed by ARPES (photon energy = 21.2 eV) | | Thermal Conductivity (κ) | 0.38 W m⁻¹ K⁻¹ @ 300 K | Phonon glass‑electron crystal (PGEC) behavior | | Seebeck Coefficient (S) | +215 µV K⁻¹ @ 550 K | p‑type dominant due to W‑d electrons | | Electrical Conductivity (σ) | 1.3 × 10⁴ S m⁻¹ @ 550 K | Optimized via Na‑doping on Ti site | A central aesthetic focus, emphasizing high-end costumes

is a popular video title in the Japanese Adult Video (JAV) industry featuring prominent actress Ai Sayama . Released in March 2023 by the studio Wanz Factory , the production is noted for its high-production value and focus on specific thematic elements. Production Details and Context | 310 K (room‑temperature) | Spontaneous polarization Pₛ

Discovery Narrative – The material was initially targeted as a to improve photocatalytic water splitting. During routine X‑ray diffraction, the team noted extra weak reflections that could not be indexed to the perovskite cell. Subsequent single‑crystal analysis uncovered a layered framework where TiO₆ octahedra alternate with organometallic “WAA” (W‑(Alkyl‑Amide)‑A) cations . The “WAA” fragment is a trivalent tungsten (W³⁺) coordinated by N‑alkyl‑amidinate ligands, which imparts both rigidity and polarizability, giving rise to the unusual ferroelectric behavior.