Voice type and below the countertenor voice. The "leggero" tenor has the highest tessitura of all the tenor subtypes. Tenor subtypes: Tenors are often divided into different subcategories based on range, vocal color or timbre, the weight of the voice, and dexterity of the voice. Tenors are often broken down into seven subcategories: "tenore contraltino", "leggero" tenor or "tenore di grazia", lyric tenor, spinto tenor or "tenore spinto", dramatic tenor, heldentenor, and baritenor. Famous tenors include Enrico Caruso, Juan Diego Flórez, Alfredo Kraus, and Luciano Pavarotti. Baritone range: The baritone voice is the middle-range voice type for males; it lies between the
Conventional superconductor a conventional superconductor was 39 K (-234 °C) in magnesium diboride. Conventional superconductor Conventional superconductors are materials that display superconductivity as described by BCS theory or its extensions. This is in contrast to unconventional superconductors, which do not. Conventional superconductors can be either type-I or type-II. Most elemental superconductors are conventional. Niobium and vanadium are type-II, while most other elemental superconductors are type-I. Critical temperatures of some elemental superconductors: Most compound and alloy superconductors are type-II materials. The most commonly used conventional superconductor in applications is a niobium-titanium alloy - this is a type-II superconductor with a superconducting critical temperature