How many lattice atoms surround a tetrahedral hole and an octahedral hole in a closest-packed structure? Describe which hole site is larger and explain why.

Q: Divalent ionic crystals. Barium oxide has the NaCl structure. Estimate the cohesive energies per…

A: For the given crystal Ba+O​​​​​​-​​ The required net amount of energy to form Ba+ and O​​​​​​- is…

Q: Do metallic elements conduct electricity because they have a small band gap energy?

A:

Q: What are the Silicate Ceramics? Give some examples? What are the uses of Silicate Ceramics?

A: Silicates are materials composed generally of silicon and oxygen. They were the first ceramics…

Q: Explain how homogeneous and heterogeneous alloys differ. Describe the differences between…

A: An alloy is a uniform mixture. It is made up of two or more chemical elements, of which at least one…

Q: Estimate the coordination number for the cations in each of these ceramic oxides and also the…

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Q: explain why graphite is a good solid lubricant

A: Why graphite is a good solid lubricant ?

Q: The standard free energy of formation of cubic silicon carbide (SiC) is 62.8 kJ mol-1 . Determine…

A: The change in free energy is used for the prediction of direction of the chemical reaction at…

Q: Germanium in silicon will be p-type or  n-type?

A: P-type semiconductors are those semiconductors in which the doping material used is from Boron…

Q: Replacement of aluminum ions in kaolinite with magnesium ions yields a compound with the formula…

A: Oxidation number is the charge on the ion of an atom. Oxidation state represents the number of…

Q: Explain why diamond is harder than graphite. Why is graphite an electrical conductor but diamond is…

A: We know that both diamond and graphite are made of carbon. However, diamond is harder than graphite…

Q: Like most transition metals, tantalum (Ta) exhibits several oxidation states. Give the formula of…

A: Introduction: The structure in which atoms, ions or molecules are arranged in a particular repeating…

Q: Carbon forms a number of allotropes, two of which are graphite and diamond. Silicon has a diamond…

A: Graphite is an allotrope of carbon which is made up of hexagonal carbon rings in which each carbon…

Q: What are Oxide Ceramics? Give some examples?

A: INTRODUCTION: Oxide ceramics are the ceramics that are non-metallic mineral materials.

Q: What is the difference between hexagonal and cubic closest packed structures? Which one has a face…

A: The smallest repeating unit with full symmetry of crystal structure is known as unit cell.

Q: 4. State the difference between cleavage and fracture of minerals, using quartz and mica as…

A: Since you have posted a question with multiple subparts, we will solve the first subparts for you.…

Q: What type of bonding is predominant in ceramics?

A: Solution-   in the ceramics two type of bonding found  (1)ionic and (2) covalent. An ionic bond…

Q: ite form of iron has fcc crystal lattice structure,whereas its alpha form has bcc crystal lattice…

A: For a Face-Centred Cubic lattice:  4r=2a where r is the radius of the atom and a is the edge length.…

Q: Discuss the need for a high-Tc superconductor.

A: High-Tc superconductor stands for high temperature superconductor. The materials that behave as a…

Q: Define a semiconductor? Describe the two main types of semiconductorswhen it is doped with(a) group…

A: Semiconductors can be defined as the solids having conductivity in between those of conductors and…

Q: Based on its phase diagram, explain the formation of cored structure during the solidification of…

A: A diagram that is used to show the equilibrium conditions between the thermodynamically-distinct…

Q: Name the three (3) unit cells commonly found in metal structures and briefly explain the method of…

A: Unit cell is the repeating unit of a lattice. It has net symmetry that a crystal possesses. Due to…

Q: The structure of bentonite is best described as Select one: a. Negatively charged aluminium silicate…

A:

Q: The gap between valence and conduction bands in silicon is 1.12 eV. A nickel nucleus in an excited…

A: Given, the energy gap between the valence and conduction band is 1.12eV and the wavelength of the…

Q: Calculate the maximum wavelength of radiation required to excite electrons between the valence and…

A: Given: The conversion of eV to joule is as follows,

Q: Draw the band structure for graphite (carbon) and explain types of band formed in graphite using…

A: Graphite: The layered structure of graphite is made up of rings of six carbon atoms organised in…

Q: Name the two most important allotropes of sulphur. Which one of the two is stable at room…

A: The two most important allotropes of sulfur are given below, That is, Rhombic form and Monoclinic…

Q: Identify the structure of each of the two-unit cells shown in Problem 47 as the rock salt structure,…

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Q: How do atomic radius ratios relate to strength in alloys?

A: The smaller the atomic radius, the more influence the nucleus has on reactivity. Since the nucleus…

Q: For a ceramic compound, what are the two characteristics of the component ions that determine the…

A: The smallest unit which on repetition gives a crystal lattice is named as a unit cell. The net atoms…

Q: Why composite biomaterials are preferred over ceramics, explain with examples.

A: Being able to use artificial intelligence to identify and automatically respond to data breaches is…

Q: Determine the radius of a spherical atom (in terms of the radius of the host atom) that can just fit…

A: In HCP and FCC structures 74% packing efficiency. The remaining is vacant and comprises interstitial…

Q: explain why graphite can be used as a lubricant

A: Lubricants are the substances or compounds which are used to reduce friction between two movable…

Q: What is metallic glass? Describe the features that promote high glass-forming ability in metals.

A: Metallic glass: It is an amorphous metal alloy. The atoms in the materials are decorated by…

Q: Describe the formation of N-type semiconductor.

A: Kindly get the answer given below.

Q: Austenite form of iron has FCC crystal lattice structure, whereas its alpha form has BCC crystal…

A: Assuming the mass of each atom of iron is M and its radius of atom is r. In case of Austenite the…

Q: What are the main differences between Diamagnetic and Paramagnetic materials?

A: Diagmagnetic substances have zero unpaired electron and paramagnetic materials contain unpaired…

Crystal Lattices and Unit Cell

Consider a crystal. The regular and repeating pattern of constituent particles is the most distinguishing feature of crystalline solids. A crystal lattice is formed when these particles are replaced with representative points. The three-dimensional arrangement of constituent particles is known as a crystal lattice. Unit cell is that the smallest portion of a space lattice which when repeated in several directions, generate the whole lattice. Unit cell is a building block of a lattice. It is the smallest unit of cell.