MgTiO3 HQ
Heat-treated state
ISO IEC 60672 Type C-320
HQ = high-purity high-Q microwave grade
Choose for microwave resonators and filters where unloaded Q dominates: high-purity, fully dense MgTiO3 with Q×f up to ~160 000 GHz and τf ≈ −50 ppm/°C.
Values for the HQ condition
Other MgTiO3 tempers and conditions
MgTiO3 is listed in 2 conditions; see the grade overview at MgTiO3.
- MCT-0
- HQ
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
MgTiO3–CaTiO3 temperature-stabilised | Pick when the resonant frequency must not drift: ~5 wt% CaTiO3 offsets the negative τf of MgTiO3, giving εr ≈ 21 and near-zero temperature coefficient for dielectric resonators and GPS/patch antennas. | — | 70 | 0 | 720 HV | 4 W/m·K |
HQThis page High-purity high-Q microwave grade | Choose for microwave resonators and filters where unloaded Q dominates: high-purity, fully dense MgTiO3 with Q×f up to ~160 000 GHz and τf ≈ −50 ppm/°C. | — | — | — | 750 HV | 6 W/m·K |
What is MgTiO3 HQ?
MgTiO3 HQ is MgTiO3 heat treated to HQ — choose for microwave resonators and filters where unloaded Q dominates: high-purity, fully dense MgTiO3 with Q×f up to ~160 000 GHz and τf ≈ −50 ppm/°C. MgTiO3 HQ has a tensile strength of 70 MPa (10.2 ksi), weaker than 60% of ceramic grades. Elongation at break is 0% and the elastic modulus is 160 GPa (23.2 Msi). MgTiO3 HQ has a density of 3.87 g/cm³ (0.14 lb/in³), lighter than 59% of ceramic grades. It melts at 1,630°C (2,966 °F).
MgTiO3 HQ properties
Typical room-temperature values for MgTiO3 HQ; 11 are specific to this condition. Other listed values are MgTiO3 reference data and may not represent this condition. Bars are the position among ceramic grades.
Physical3
MgTiO3 HQ has a density of 3.87 g/cm³ (0.14 lb/in³), lighter than 59% of ceramic grades. It melts at 1,630°C (2,966 °F).
Mechanical12
MgTiO3 HQ has a tensile strength of 70 MPa (10.2 ksi), weaker than 60% of ceramic grades. Elongation at break is 0% and the elastic modulus is 160 GPa (23.2 Msi).
Thermal5
MgTiO3 HQ is rated for continuous service to 1,000°C (1,832 °F). It conducts heat at 5.5 W/m·K (3.18 BTU/hr·ft·°F), worse than 61% of ceramic grades. Thermal expansion is 7.5 µm/m·K (4.17 µin/in·°F).
Electrical5
MgTiO3 HQ is an electrical insulator with a dielectric strength of 12 kV/mm (304.8 V/mil) and a resistivity of 1×10¹³ Ω·m.
Chemical & Environmental2
Corrosion resistance is excellent (85/100), better than 69% of ceramic grades.
Sustainability4
Producing a kilogram of MgTiO3 HQ takes about 65 MJ of energy and emits 5.5 kg of CO₂ — less than 74% of ceramic grades. Typical recycled content is 0%.
Manufacturability3
MgTiO3 HQ's machinability is not recommended (5/100, worse than 59% of ceramic grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with MgTiO3 HQ
Is MgTiO3 easy to machine?
Machine in the green or bisque state (turning, drilling, CNC milling) with ~15–18 % firing shrinkage allowance; fired parts require diamond grinding, lapping or laser scribing only.
Can MgTiO3 be welded?
Not weldable — join by active-brazing (Ag-Cu-Ti) or glass frit; metallise with fired Ag/Mo-Mn + Ni for solderable electrodes.
Can MgTiO3 be formed, bent or molded?
Dry pressing, isostatic pressing, extrusion or tape casting of spray-dried powder, then sintering at ~1350–1470 °C in air with slow heat-up to burn out binder.
What surface finishes work on MgTiO3?
Diamond lapping/polishing to <0.1 µm Ra for microwave surfaces; thick-film Ag or thin-film Ti/Cu/Au metallisation for electrodes; no plating on the bare ceramic.
MgTiO3 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| TiO2as MgTiO3 stoichiometry | 63 – 68 | 66.5 |
| CaTiO3temperature-compensating addition, ~5 wt% in MCT-0 variant | 0 – 8 | 0 |
| SiO2 + Al2O3 + alkali (sintering aids/imkept low in high-Q grades | 0 – 2 | 0.5 |
| MgOas MgTiO3 stoichiometry | ≥ 30 (balance) | — |
MgTiO3 HQ — frequently asked
What is MgTiO3 HQ used for?
MgTiO3 HQ is typically used for temperature-compensating capacitors, microwave resonators and RF dielectrics. In short: low-loss microwave dielectric; temperature-compensating capacitor ceramic; green-machined near-net shapes.
What is the tensile strength of MgTiO3 HQ?
MgTiO3 HQ has a typical tensile strength of 70 MPa (10.2 ksi) — weaker than 60% of ceramic grades. Strength varies by condition: see the 2 listed tempers.
Is MgTiO3 HQ easy to machine?
Not especially — machinability is rated not recommended (5/100, worse than 59% of ceramic grades). Machine in the green or bisque state (turning, drilling, CNC milling) with ~15–18 % firing shrinkage allowance; fired parts require diamond grinding, lapping or laser scribing only.
Can MgTiO3 HQ be welded?
Not weldable — join by active-brazing (Ag-Cu-Ti) or glass frit; metallise with fired Ag/Mo-Mn + Ni for solderable electrodes.
What surface finishes work on MgTiO3 HQ?
Diamond lapping/polishing to <0.1 µm Ra for microwave surfaces; thick-film Ag or thin-film Ti/Cu/Au metallisation for electrodes; no plating on the bare ceramic.
Can MgTiO3 HQ be formed, bent or molded?
Dry pressing, isostatic pressing, extrusion or tape casting of spray-dried powder, then sintering at ~1350–1470 °C in air with slow heat-up to burn out binder.
What is the maximum service temperature of MgTiO3 HQ?
MgTiO3 HQ is rated for continuous use to about 1,000°C (1,832 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- IEC 60672-3 Ceramic and glass insulating materials — Part 3: Specifications for individual materials — IEC (1997)
- Engineered Materials Handbook Vol. 4: Ceramics and Glasses — ASM International (1991)
- Magnesium titanate / MCT microwave dielectric resonator materials — Trans-Tech (Skyworks) (2022)
- Microwave dielectric ceramics property compilations (MgTiO3, MgTiO3–CaTiO3) — J. Am. Ceram. Soc. / J. Eur. Ceram. Soc. literature (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.